new species of from mexico (acari: oribatei: … 40/vol40num1/67-82.pdfdepartamento de biología,...

Folia Entomol. Mex. 40(1):67-81 (2001)

NEW SPECIES OF TRIMALACONOTHRUS FROM MEXICO (ACARI: ORIBATEI: MALACONOTHRIDAE)

RICARDO IGLESIAS1, JOSÉ G. PALACIOS-VARGAS1 AND SANDOR MAHUNKA2

'Laboratorio de Ecología y Sistemática de Microartrópodos. Departamento de Biología, Facultad de Ciencias, UNAM. 045f0 México, D.F., MEXICO.

2Department of Zoology, Hungarian Natural History Museum, H-1088 Budapest, Baross u. 13, HUNGARY.

RESUMEN. Se describen e ilustran seis especies nuevas mexicanas de Trimalaconothrus que viven en el dosel, suelo, agua y hojarasca. Se proporciona una clave para la determinación de las especies de las regiones Neotropical y Neartica del género. PALABRAS CLAVE: Trimalaconothrus, especies nuevas, dosel, suelo, hojarasca, acuático, clave, México.

ABSTRACT. Six new Mexican Trimalaconothrus living in the canopy, soil, water and litter are described and illustrated. A key for determination of Neotropical and Nearctic species of the genus is given. KEY WORDS: Trimalaconothrus, new species, canopy, soil, litter, water, key, México.

About 60 species of the cosmopolitan genus Trimalaconothrus Be riese, 1916 ha ve been described most of them living in wet moss, often in lichens, bar k of trees, soil litter, and water, but they were not reported from the canopies of tropical forest before. We describe here the first two species collected from this habitat. Most species of the genus Trimalaconothrus known from the Neotropical Region, were described by Hammer (1962). She reported nine species, particularly from Chile. From the United States and Canada there are eight species known (Marshall, Reeves and Norton, 1987) that seem to have a wide distribution. We have also identified six different undescribed species from Mexico (Iglesias, 1995), that are described here.

GENUS TR1MALACONOTHRUS BERLESE, 1916

Diagnosis: Legs heterotridactylous. Distance between setae cl-c1longer (two times) or similar to d1- d1. Lyrifissure ia located between setae c2 and c3 or just behind c2. Epimera IV concave posteriorly. Number of genital setae from 4 to 12. Tarsus long and slender.

Type-species: Malaconothrus (Trimalaconothrus) indusiatus BERLESE, 1916

Trimalaconothrus pitentzin sp. nov. (Fig. 1 A-B)

Dimensions: Length 414 ,um, width 177,um Color: Yellowish.

Iglesias et al.: New species of Trimalaconothrus

Prodorsum: Rostrum rounded. There is a weak transverse ridge situated just behind interlamellar setae. There is also a ridge parallel to margin of prodorsum. All prodorsal setae very thin, smooth and long. The rostral setae inserted late rally, very separated between from each other. The lamellar setae reach the base of rostral setae; the interlamellar setae out -reach the bases of lame llar setae. The length and relative distance between themselves are as follows: in > le > ro > ex; ro = (roro); le > (le-le); in < (in-in); in = 4.5 X ex; ex < (ex- ex). Integument is finely granular. Notogaster: One pair of longitudinal ridges goes from el to hl, forming at their end a deep V -shaped figure. The margins of noto gas ter are parallel in the anterior part. All setae are thin and smooth. The length and relative distance are as follows: h3 > h2 > ps2 > c3 > ps3 > e2 > el = ep > d2 = j2 > hl > e2 > dl > el > psi; (hl-hl) > (el-el) =(el-el) > (dl-dl). Integument is finely granular. Ventral regían: Anal plate with one pair of small setae inserted immediately posterior to ad2. Adanal plate with three setae, long and thin. Genital plate with five pairs of setae, which are, thin and long. Both, anal and genital setae smooth. The length and relative distance are as follows: g5 > g4 = g3 = g2 > gl; (g5-g4) > (g4-g3) = (g3-g2) > (g2-gl). Epimeral formula is: 3-1-3-3. Epimeral setae of different length (Fig. lB).

100 ~u

Fig. l. Trii7Ullaconothrus pitentzin sp. nov. A: dorsal aspect; B: ventral aspect.

68

Type material: Holotype Sistemática de Microartn

Type locality: MEXICO above the sea; ex-soil fro

Etymology: Proceeding f this species.

Discussion: Trimalacon1 blaneus Hammer, 1961. 1

are al so similar, hl and h in T. blaneus. On the con species.

Tril

Dimensions: Length 423( Color: greyish green Prodorsum: Rostrum rou interlamellar setae. Lame setae. Rostral setae are tl Both, interlamellar and prodorsum. Length and n > ex; ro < (ro-ro), le lntegument with distinct 1

Notogaster: Elliptical in s relative distance between = hl > el = ep = h3 • (el-el) > (el-el) > (dl ip is longer than ia and Í1 Ventral regían: Anal plate pairs of long setae. Botb between adl and ad2. Ge The length and relative di = g5 > gl ; (g5-g4) > medially. Epimeral formt tridactylous (Fig. 2B).

Type material: Holotype

Type locality: MEXICO, the sea; ex-iitter from fo

Etimology: Related to th species

~conothrus

ridge situated just behind margin of prodorsum. All

setae inserted laterally, very reach the base of rostral

setae. The Iength and > le > ro > ex; ro = (ro

ex). lntegument is finely

to hl forming at their end in the anterior part.

are as follows: h3 > > hl > c2 > di > el >

is finely granular. immediately posterior

plate with five pairs setae smooth. The Iength > gl; (g5-g4) > (g4-g3)

Epimeral setae of different

Folia Entomol. Mex. 40(1) (2001)

Type material: Holotype female on slide is deposited in Laboratorio de Ecología y Sistemática de Microartrópodos (LESM).

Type locality: MEXICO, Veracruz, Almagres; 18° 14' N and 95° 56' W; 200m above the sea; ex-soil from forest; 29- IV- 1994. A. Gomez col.

Etymology: Proceeding from Nahuatl pitentzin ( = small), denoting the small size of this species. ·

Discussion: Trimalaconothrus pitentzin sp. nov. is similar to Trimalaconothrus blancus Hammer, 1961. Both present a pair of ridges on the noto gas ter and the setae are al so similar, hl and h2 are of the same size approximately, and h3 is very small in T. blancus. On the contrary, setae ps 1 and the anal seta e are very small in the new species.

Trimalaconothrus almagrensis sp. nov. (Fig. 2 A-C)

Dimensions: Length 423(414-433) ¡tm, width 207(187-226) ¡tm. Color: greyish green Prodorsum: Rostrum rounded. There is a transverse ridge situated just posterior to interlamellar setae. Lamellar ridge goes from above interlamellar setae toward rostral setae. Rostral setae are thin and smooth. inserted just on final part of lame llar ridge. Both, interlamellar and Iamellar setae directed toward the lateral margin of prodorsum. Length and relative measure between setae are as follows: in > le > ro > ex; ro < (ro-ro), le > (le-le); in < (in-in); in = 2.8 X ex; ex < (ex-ex). Integument with distinct granulation. Notogaster: Elliptical in shape, without ridges. All setae are smooth. The Iength and relative distance between the notogastral setae are as follows: h2 > c3 = e2 > ps2 = hl > el = cp = h3 > di > j2 < el = ps3 > d2 = psi > c2; (hl-hl) > (el-el) > (el-el) > (dl-dl). Setae h3 are inserted on ventral part. The Iyrifissure ip is longer than ia and im. Integument distinctly granulated (Fig. 2A, 2C). Ventral region: Anal plates with a pair of small setae. The adanal plates present three pairs of long setae. Both, anal and adanal setae are smooth. Anal setae are inserted between adl and ad2. Genital plate with five pairs of long setae, thin and smooth. The length and relative distance between genital setae are as follows: g4 = g3 > g2 = g5 > gl ; (g5-g4) > (g4-g3) = (g3-g2) > (g2-gl). All epimeres are separated medially. Epimeral formula is 3-1-3-3. The granulation of the epimera is fine. Legs tridactylous (Fig. 2B).

Type material: Holotype female and two paratypes on slides deposited in LESM

Type locality: MEXICO, Veracruz, Almagres; 18° 14' N and 95° 56' W; 200 above the sea; ex-litter from forest; 29-IV-1994; A. Gomez col.

Etimology: Related to the Iocality, town Almagres, where was collected the new species

69


100 ~u

e Fig. 2. Trimalaconothrus almagrensis sp. nov. A: dorsal aspect; B: ventral aspect; C: integument of notogaster

70

Discussion: Trimalaconc Hammer, 1958 and T. differences of T. almagn noto gas ter, and the lengtt seta in the new species is

Tn

Dimensions: Length 4631 Color: Yellowish. Prodorsum: Rostrum sligt anteriorly. Lamellar seta1 directed toward laterals n the other setae of prodors1 follows: in > le > ro > ex; ex < (ex-ex). lntegur Notogaster: With one pail There is other transverse 1

sinuate. The length and n h2 > c3 = h3 > hl > e el) > (dl-dl). Lyrifissm to c3 rather than to c2. 1 bigger than those of the p Ventral region: Anal platt three pairs of long, thin !

length and relative distan1 g2 > gl ; (g5-g4) = (g4 smooth. Epimeral formut 3B).

Type material: Holotype

Type locality: MEXICO 105° 03' W; 200m abovt Castaño col.

Etymology: The name of lives.

Discussion: Trimalacono, and T. lisosetosus sp. nc however T. canopeus is <

setae (much bigger and Cl of one pair. T. canopeu! and T. lisosetosus sp. nm

~onothrus

ventral aspect; C: integument of

Folia Entamo!. Mex. 40(1) (2001)

Discussion: Trimalaconothrus almagrensis sp. nov. is similar to T. montanus Hammer, 1958 and T. hakonensis Yamamoto, 1977. The most conspicuous differences of T. almagrensis with T. montanus is the lack of the dorsal ridge on noto gas ter, and the length of rostral setae, shorter in montanus. The exobothridial seta in the new species is longer that of T. hakonensis.

Trimalaconothrus canopeus sp. nov. (Fig. 3 A-D).

Dimensions: Length 463(453-473) ¡.tm, width 246(237-256) ¡.tm. Color: Yellowish. Prodorsum: Rostrum slightly rounded. Rostral setae inserted laterally directed toward anteriorly. Lamellar setae reaching bases of rostral setae. The interlamellar setae directed toward laterals margins. The rostral setae are weakly barbulated (Fig. 30), the other setae of prodorsum are smooth and thin. The length and relative distance are follows: in > le > ro > ex; ro > (ro-ro); le > (le-le); in > (in-in); in = 4.1 X ex; ex < (ex-ex). lntegument is granular. Notogaster: With one pair of ridges running from between setae el and reaching h !. There is other transverse ridge between h I-h l. The c3, e2, f2, h2 and ps 1 are slightly sinuate. The length and relative distance are as follows: e2 = ps2 > ps3 > psi = h2 > c3 = h3 > hl> el= el> cp = d2 = dl> c2; (hl-hl) > (el-el)= (elel) > (dl-dl). Lyrifissure ip near the insertion of h2; ia are situated more closely to c3 rather than to c2. lntegument of notogaster is granular (Fig. 3C), which are bigger than those of the prodorsum (Fig. 3A). Ventral region: Anal plates presents two pairs of small, thin setae. Adanal plate with three pairs of long, thin setae. Genital plate with five pairs of long, thin setae. The length and relative distance between genital setae are as follows: g5 = g4 > g3 > g2 > gl ; (g5-g4) = (g4-g3) = (g3-g2) > (g2-gl). All anal and genital setae are smooth. Epimeral formula is: 3-1-3-3. lntegument of epimera is finely granular (Fig. 3B).

Type material: Holotype female and one paratype on slide are deposited in LESM.

Type locality: MEXICO, Jalisco, Estación de Biología de Charnela, 19° 30' N and 105° 03' W; 200m above the sea; ex-canopy oftropical dry forest; 17-VII-1992; G. Castaño col.

Etymology: The name of the new species refers to tree canopy, the habitat where it lives.

Discussion: Trimalaconothrus canopeus sp. nov. is similar to T. pitentzin sp. nov. and T. lisosetosus sp. nov. in the presence of longitudinal ridges on notogaster, however T. canopeus is clearly differentiated because the length of the notogastral setae (much bigger and curling) and the presence of two pairs of anal setae, instead of one pair. T. canopeus sp. nov. lives in the canopy, while T. pitentzin sp. nov. and T. lisosetosus sp. nov. live in soil.

71


(

e D

Fig. 3. Trimalaconothrus canopeus sp. nov. A: dorsal aspect; B: ventral aspect; C: integument of notogaster; D: rostral setae.

72

, ~ (,&·

;.

·. · .. ·

::,.;:: ·.'.: ' >::<.-

1·:,'':.::::"'::: . ;·::. ·~·.'

~

N M L K Fig. 4. Trimalaconothrus eichh c2; G: c3; H: di; I: d2; J: cp; 1

~onothrus

entral aspect; C: integument of

Folia Entorno!. Mex. 40(1) (2001)

NMLKJIHGFED C Fig. 4. Trimalaconothrus eichhornicus sp. nov. A: dorsal aspect; B: ventral aspect; C: ro; D: le; E: el; F: c2; G: c3; H: dl; I: d2; J: cp; K: el; L:j2; M: h3; N: psi.

73


Trimalaconothrus eichhornicus sp. nov. (Figs. 4 A-N).

Dimensions: Length 621 ¡.¿m; width 325¡.¿m. Color: Y ellowish Prodorsum: There is a ridge parallel to margin of prodorsum running from anterior part toward posterior, the mid-point of prodorsum. There is also a slight transverse ridge behind interlamellar setae. Rostral setae are thin and slightly barbulate (Fig. 4 C), adjacent from each other and directed toward anterior part. The lamellar setae are slightly barbulate and inserted on separate tubercles (Fig. 4 D). lnterlamellar setae, thin and smooth, are directed toward the lateral margin. The length and relative distance are as follows: in > le > ro > ex; ro > (ro-ro); le > (le-le); in < (in-in); in = 4 X ex; ex < (ex-ex). Integument is finely granular. Notogaster: There is a weak lateral ridge, very near to margin of notogaster that goes from c3 and reaches h2. Only setae e2, h1 and h2 are smooth, inserted on a small tubercles, the other notogastral setae slightly barbulate ( Fig. 4 E-N). The length and relative distance of them are as follows: h2 > e2 > hl > ps2 > psi = c3 > d2 = cp > f2 = h3 > el > di > ps3 > c2 > el; (hl-hl) > (el-el) > (dl-dl) = (el-el). Integument of notogaster is finely granular as on prodorsum (Fig. 4A). Ventral region: No anal setae observed. Genital plate with six pairs of short, smooth and thin setae. The length and relative distance between genital setae are as follows: g4 = g3 > g6 > g2 = g/ > g5; (g6-g5) > (g5-g4) > (g4-g3) > (g3-g2) > (g2-gl). The epimeral formula as follows: 3-1-3-3. Integument finely granular.

Type material: Holotype female on slide deposited in LESM

Type locality: MEXICO, Veracruz, San Andres Tuxtla; 18° 34' N and 95° 04' E; 200 above the sea; ex- aquatic lily (Eichhornia crassipes); 28-XII-1994; A. Cadena, col.

Etymology: The name origin from of the genus of the lily on which the species was found.

Discussion: Trimalaconothrus eichhornicus sp. nov. is similar to Trimalaconothrus aquatilis Fain et al., 1990. Both present barbulated lamellar and rostral setae ; notogaster and prodorsum granulated; setae e2, hl and h2 of the same length and smooth; rostral setae far from each other; lamellar setae and sensillus of the same size. Differences are as follows: setae e are smaller than setae d in T. eichhornicus while in the second species they are about the same size. T. eichhornicus sp. nov. has six genital setae and T. aquatilis eight. The new species has no anal setae and T. aquatilis has one pair.

Trimalaconothrus lisosetosus sp. nov. (Figs.5 A-B)

Dimensions: Length 463 ¡.¿m; width 237 ¡.¿m. Color: Greyish green

74

F

Fig. 5. Trimalaconothrus liso

'Jconothrus

¡,nov.

i ~sum running from anterior e is also a slight transverse

d slightly barbulate (Fig. 'or part. The lamellar setae

(Fig. 4 D). Interlamellar gin. The length and relative ; le > (le-le); in < (in-in);

gin of notogaster that goes mooth, inserted on a small ig. 4 E-N). The length and > ps2 >psi = c3 > d2 1) > (el-el) > (dl-dl) = n prodorsum (Fig. 4A).

six pairs of short, smooth enital setae are as follows: (g4-g3) > (g3-g2) > (g2-nt finely granular.

18° 34' N and 95° 04' E· · 28-XII-1994; A. Cadena:

on which the species was

ilar to Trimalaconothrus ellar and rostral setae ;

2 of the same length and and sensillus of the same

setae d in T. eichhornicus eichhornicus sp. nov. has has no anal setae and T.

ov.

Folia Entamo!. Mex. 40(1) (2001)

e Fig. 5. Trimalaconothrus lisosetosus sp. nov. A: dorsal aspect; B: ventral aspect; C: rostral setae

75


Prodorsum: Rostrum broadly rounded. There is a slight ridge that runs parallel to the margin of anterior half of prodorsum; there is also a transversal ridge situated immediately behind of the insertion of interlamellar setae. The rostral setae are slightly barbulated and inserted laterally projecting forward, the other setae of prodorsum are smooth and thin. The lamellar setae are inserted on half prodorsum part projecting forward. The length and distance between prodorsal setae as follows: in >le > ro > ex; in = 4.5X ex; ro = (ro-ro); le > (le-le); in < (in-in). Only rostral setae are barbulated, the other setae of prodorsum are smooth and thin. Integument is granular. Notogaster: There is a pair of longitudinal ridges that originate between setae el-el and runs towards bases of setae h2. Al! setae are smooth and thin. The length and relative distance of them as follows: h2 = h3 = ps2 > ps3 > c3 > dl > j2 = e2 > el = cp = d2 > el > hl =psi > c2. (hl-hl) > (el-el) > (el-el) > (dl-dl). The setae el are inserted on a small tubercle. Integument is granular, similar to prodorsal. The margin of anterior region of noto gas ter anterior to setae e2. The margin of notogaster is slightly sinuate (Fig. 5A). Ventral region: Anal plates are provided with one pair of minute, thin setae; adanal plates have three pairs of long, thin setae. Genital plate with five pairs of long, thin setae. Relative length and mutual distance of them as follows: g5 > g4 = g3 > g2 > gl; (g5-g4) > (g4-g3) = (g3-g2) > (g2-gl). The setae g5 are longer than other genital. Al! anal and genital setae are smooth. Epimeral formula of the setae as follows: 3-1-3-2. Setae lb, 3b, 3c and 4b of epimeres are very long. Integument slightly granular (Fig. 5B).

Type material: Holotype female on slide is deposited in LESM.

Type locality: MEXICO, Jalisco, Estacion de Biología Charnela; 19° 30' N and 105° 03' W; ex soil; 14-III-1992; B. E. Mejía col.

Etymology: Related to the smooth shape (Spanish = liso) of the notogastral seta

Discussion: Trimalaconothrus lisosetosus sp. nov. is similar to T. montanus Hammer, 1958. Both species presenta pair of ridges on notogaster and the setae are thin and smooth; the interlamellar seta e are m u eh shorter than the distance in-in. However, the notogastral lateral margins in the first species are parallel, while in the second species are convex. The rostral setae are longer in the new species and the notogastral ridges are better developed.

Trimalaconothrus magnisetosus sp. nov. (Figs. 6 A-B)

Dimensions: Length 601(591-611) ¡¡.m, width 319 (306-345) ¡.tm .. Color: Brownish Prodorsum: Subtriangular in shape. One pair of arched ridges is visible in dorsal aspect going from interlamellar setae towards rostral setae. At large magnification the interlamellar and exobothridial setae are slightly barbulated. Length and relative measure between setae are as follows: in > le > ro > ex; ro > (ro-ro); le > (le-

76

Fo

le), in > (in-in), in = 3.8

Fig. 6. Trimalaconoth

~conothrus

1ridge that runs parallel to the i a transversal ridge situated .setae. The rostral setae are [orward, the other setae of

~ inserted on half prodorsum

n prodorsal setae as follows: . (le-le); in < (in-in). Only ~rsum are smooth and thin.

riginate between setae el -el th and thin. The length and ps3 > c3 > dl > f2 = e2

1-cl) >(el-el) > (dl-dl). ent is granular, similar to anterior to setae e2. The

f minute, thin setae; adanal with five pairs of long, thin llows: g5 > g4 = g3 > g2 tae g5 are longer than other ral formula of the setae as are very long. Integument

LESM.

19° 30' N and

) of the notogastral seta

arto T. montanus Hammer, and the setae are thin and

e distance in-in. However, ralle!, while in the second species and the notogastral

. nov.

45) ¡¡,m ..

ridges is visible in dorsal . At large magnification the lated. Length and relative

; ro > (ro-ro); le > (le-


le), in > (in-in), in = 3.8 X ex.

Fig. 6. Trimalaconothrus magnisetosus sp. nov. A: dorsal aspect; B: ventral aspect.

77


Notogaster: Posterior margin "V"shaped, lateral margins almost parallel. There is a small ridge running posteriorly of dl to the base of hl, where it bends to the center to forma "V" shape. Another is from alveolus offl to setae hl. Dorsocentral setae are smooth, very long and curling. Setae e2, j2 and psi barbulated at high magnification. The length and relative distance between the notogastral setae are as follows: h2 > el=hl >di >el > e2> ps2 >psi > c3 > ep = d2 > h3 > ps3 > j2 > e2. Integument slightly granular, mainly in lateral margins (Fig. 6A). Ventral region: Anal plate with two very small setae. Each adanal plate with three smooth long setae. Anogenital formula is 6, O, 3, 2. Epimeral formula is 3-1-3-3. Epimera III fused in the anteromedian part (Fig. 6B).

Type material: Holotype female, two paratypes females from the same region, same date. All material on slides , deposited in LESM.

Type locality: MEXICO, Veracruz, Tropical Biological Station of Los Tuxtlas; 18° 34' N and 95° 04' E; 200 above the sea; ex-leaves of Neetandra ambigens, from the canopy of Astroearium mexieanum. 20-X-1996, J. Alvarez col.

Etymology. The name refers to the long notogastral setae of this species

Discussion: In this new species the distance el-el is two times that of dl-dl. This character is suppose to be generic for Fossonothrus Hammer, 1962, but in our specimens the lyrifissure ia is located between the setae e2 and e3, which is known to be characteristic of Trimalaeonothrus. T. magnisetosus sp. nov. is similar to Trimalaeonothrus wuyanensis Yamamoto et al., 1993, in the form of prodorsal crest, and "V" shaped posterior margin ofthe notogaster, but differs in having much longer and curling notogastral setae and only six pairs of genital setae instead of 7. Other important difference is that the length of setae ex is much longer in T. wuyanensis (ratio in 1 ex= 2.1) than in T. magnisetosus sp. nov. (ratio= 4.1). In both species there are two minute anal seta e. Ratio distan ce e 1-cl 1 d1-dl is l. 3 in T. wuyanensis and 2.0 in T. magnisetosus sp. nov. The new Mexican species is also similar to T.eanopeus sp. nov, which differs in having longer anal setae and shorter distance between setae el-el.

ACKNOWLEDGMENTS

Thanks to Drs. Pablo Martínez (Depto. de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Mar del Plata, Argentina); Heinrich Schatz (lnstitute of Zoology, Innsbruck, Austria) and Ziemowit Olszanowski (Dept. Animal Taxonomy & Ecology, A. Mickiewicz University, Szamarzewskiego 91 A, 60-569 Poland) who kindly reviewed the manuscript and gave important comments and suggestions. This article is part ofthe project ofCONACyT for the study ofthe biodiversity ofMexican mites. One species belong to the project DGAPA IN-2180-96 in charge of Dr. Javier Alvarez (Laboratorio de Ecología , Fac. Ciencias, UNAM).

78

Fo.

COMPARATIVE TRI MAL

sp/character g.s. a.s.

australls 5 o barrancensls 4 a.1 blancus 4 a.1 cajamarcensls 10 a.a. g/aber 7 2 montanus 4 ? novus 8 a.a. oxyrhlnchus 4 1 platyrhinus 4 1 magnlssetosus 6 2-almagrensls 5 2 pltentzln 5 2 canopeus 3 2 elchhornlcus 6 o 1/sosetosus 5 1

Explanations of abbreviations a= alve c1-c1/d1-d1 = distance betwftn sstae in divided by the length of setae ex, "1 s = short.

~laconothrus

gins almost parallel. There is a 11, where it bends to the center lo setae hl. Dorsocentral setae ~ and psi barbulated at high ~en the notogastral setae are as ~1 > c3 > cp = d2 > h3 > ~in lateral margins (Fig. 6A). L Each adanal plate with three !,Epimeral formula is 3-1-3-3.

les from the same region, same

cal Station of Los Tuxtlas; 18° r-Jectandra ambigens, from the warez col.

Jetae of this species

o times that of dl-dl. This Hammer, 1962, but in our

e c2 and c3, which is known etosus sp. nov. is similar to

differs in having much longer ita! setae instead of 7. Other uch longer in T. wuyanensis (ratio= 4.1). In both species 1-d1 is 1.3 in T. wuyanensis

an species is also similar to al setae and shorter distance

Facultad de Ciencias Exactas Heinrich Schatz (lnstitute of ki (Dept. Animal Taxonomy o 91 A, 60-569 Poland) who ments and suggestions. This f the biodiversity of Mexican 80-96 in charge of Dr. Javier AM).


Table 1

COMPARATIVE TABLE OF SELECTED CHARACTERS OF TRIMALACONOTHRUS FROM AMERICA

splcharacter g.s. a.s. ad c1 d1 c1-c1/d1-d1 in/ex ridges "V"

australls 5 o 3 S S 3.7 + barrancensls 4 a.1 3 S S 1.1 13 + blancus 4 a.1 3 L L 1.4 4.6 + cajamarcens/s 10 a.a. 3 S S 12 + glaber 7 2 1 S S 1 10 + montanus 4 ? 3 L L 3.6 novus 8 a.a. 3 S S 1 9.3 + oxyrhlnchus 4 1 3 L L 6.3 platyrhlnus 4 1 3 L L 1.1 3 magnlssetosus 6 2- 3 v1 v1 2.0 4.1 + almagrensls 5 2 3 L L 1.2 3.3 pltentzln 5 2 3 L L 1.7 5 + canopeus 3 2 3 v1 v1 1.4 4.6 + elchhornlcus 6 o 3 S S 1 7.5 1/sosetosus 5 1 3 S S 1.5 5 +

Explanatlons of abbrevlatlons a= alveolus, g.s.= genital seise, a.s. = anal salsa, ad =adanal seise, c1, d1 = sals di c1-c1/d1-<11 = dislsnce between setae e divided by distance between seise d, in/ex = ratio of the length of setae in dividad by tha length of seise ex, "V"= notogastral ridgas in the form of invertad "V", vi = vary long, L = long s = short.

79

Iglesias et al.: New speeies of Trimalaconothrus

Key for the American species of Trimalaconothrus

l. With 10 pairs of genital setae . . . . . . T. eajamareensis Hammer, 1961. 1' With fewer than 10 pairs of genital setae . . . . . . . . . . . . . . . . . . . 2 2. With 8 pairs of genital setae ............ T. novus (Sellnick, 1921) 2' With less than 8 pairs of genital setae . . . . . . . . . . . . . . . . . . . . . 3 3. With seven pairs of genital setae ............... T. glaber (Mich.) 3' With fewer pairs of genital setae . . . . . . . . . . . . . . . 4 4. With six pairs of genital setae . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4' With five or four pairs of genital setae . . . . . . . . . . . . . . . . . . . . . 6 5. No anal setae and short notogastral setae . . . . T. eiehhornieus sp. nov. 5 · Two pairs of minute anal setae and very long notogastral setae . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T. magnisetosus sp. nov. 6. With five pairs of genital setae . . . . . . . . . . . . . 7 6' With four pairs of genitals setae . . . . . . . . 11 7. Notogastral setae e and d short . . . . . . . . . . . 8 T Notogastral setae e and d long . . . . . . . . . . . . . 9 8. No anal setae, distance between setae el-el similar to dl-dl ....... .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . T. australis Hammer 1995 8' One pair of anal setae, distance between setae el-el about 1.5 times that of

dl-di . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T. lisosetosus sp. nov 9. Seta el reaching and passing the insertion of seta dl ............ .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T. eanopeus sp. nov. 9' Seta el not reaching the insertion of seta dl . . . . . . . . . . . . . . . . 10 10. Distance el-el about 1.2 the distance of dl-dl, and relatively long seta ex

(inlex=3.3) .......................... T. pitentzin sp. nov. 10' Distance el-el about 1.7 that of dl-dl, and shorter setae ex (in/ex =5) .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T. almagrensis sp. nov. 11. Notogastral setae long, ex relatively long (in/ex=J-4.6) . . . . . . . . . 12 11' Notogastral setae very short, ex very short (in/ex = 13) .......... .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . T. barraneensis Hammer, 1961 12. With notogastral ridges in the form of inverted "V". One pair of anal setae

and another represented by the alveolus; distance el-el 1.4 that of di -dl-. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T. blaneus Hammer, 1961

12' Without notogastral ridges in the form of "V" . . . . . . . . . . . . . . . 13 13. Seta in about 6.3 times length of ex . . . . T. oxyrhinehus Hammer, 1962 13' Seta in about 3.0 times length of ex . . . . T. platyrhinus Hammer, 1962

* T. angulatus, T. erinitus, T. erispus, T. foveolatus, T. montanus, and T. simplex are not included in the key because the lack of information about the morphology.

LITERA TURE CITED

BALOGH, J. & P. BALOGH. 1988. Oribatid mites ofthe Neotropical Region l.- Akademiae Kiadó, Budapest, 335 pp.

FAIN, A., L. LAMBRECHTS & G. WAUTHY. 1990. Observations on the acarofauna of fish aquariums IV: A new Trimalaconothrus, T. aquatilis sp. n. (Malaconothridae, Oribatida) from an aquarium containing

80

Angel Fishes.- Entomologie, 60 HAMMER, M. 1958. Investigations

Bolivia.- Biol. Skr. Dan. Vid. St HAMMER, M. 1962.- Investigatior

Dan. Vid. Selsk., 13(2): 126 p. IGLESIAS, R. 1995. Taxonomía de 1:

Facultad de Ciencias, UNAM. í MARSHALL, V. G., R. M. REEVE

Continental United States and C: TARRAS-WAHLBERG. 1985. Trima[,

mites from Lake Nevada.- lnt. J Y AMAMOTO, l. 1993. Oribatid mite

of the family Malaconothridae (

Recibido: 24 abril 2000. Aceptado: 16 octubre 2000 .

Hammer, 1961. . . . . . . . . . . . . . . . . . 2 . . T. novus (Sellnick, 1921) ................. 3 . . . . . . . T. glaber (Mich.) ................. 4 ................ 5

. . . . . . . . . . . . . . . . . 6

. . T. eiehhornieus sp. nov. notogastral setae . . . . . . . . T. magnisetosus sp. nov. . . . . . . . . . . . . . . . . . 7 . . . . . . . . . . . 11 . . . . . . . . . . 8 ................. 9

to dl-dl ....... . . T. australis Hammer 1995 el-el about 1.5 times that of

. . . T. lisosetosus sp. nov dl ............ .

. . . . T. eanopeus sp. nov. 10

, and relatively long seta ex .... T. pitentzin sp. nov.

setae ex (in/ex =5) . . . T. almagrensis sp. nov. =3-4.6) . . . . . . . . . 12

= 13) .......... . lnll'rnmr,Pni'H. Hammer, 1961

"V". One pair of anal setae el-el 1.4 that of di-di-

T. blaneus Hammer, 1961 13

oxyrhinehus Hammer, 1962 platyrhinus Hammer, 1962

montanus, and T. simplex about the morphology.

l.- Akademiae Kiadó, Budapest,


Angel Fishes.- Entomologie, 60:103-107. HAMMER, M. 1958. Investigations on the oribatid fauna of the Andes Mountains. l.- The Argentine and

Bolivia.- Biol. Skr. Dan. Vid. Selsk., 10 (1): 27-33. HAMMER, M. 1962.- Investigations on the oribatid fauna of the Andes Mountains. 111. Chile.- Biol. Skr.

Dan. Vid. Selsk., 13(2): 126 p . IGLESIAS, R. 1995. Taxonomía de Acaros Crotonioidea (Acari: Oribatei) de México.- Tesis de licenciatura .

Facultad de Ciencias, UNAM. 74 pp. MARSHALL, V. G., R. M. REEVES & R. A. NORTON. 1987. Catalogue of the Oribatida (Acari) of

Continental United States and Canada. Mem. Entorno!. Society ofCanada 3: 1-418 . T ARRAS-W AHLBERG. 1985. Trimalaconothrus scimitarum n. sp. (Oribatida: Malaconothridae ). and aquatic

mites from Lake Nevada.- Int. l. Acarol., 11(1): 17-21. YAMAMOTO,l. 1993. Oribatid mites from subtropical forests ofWu-yan-ling East China. Two new species

of the family Malaconothridae (Acari: Oribatei).- Edaphologia, 49: 25-31 .

Recibido: 24 abril 2000 . Aceptado: 16 octubre 2000 .

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