jib 116 vc310mollusca, annelida
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Phylum Mollusca
2nd
largest phylum after ArthropodaLatin molluscus means soft
90 000 living sp
70 000 fossil sp
Very diverse group incl: chitons, snails,
slug, clams, mussels, oysters, suids,
octopus!
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" #a$itats range from tropics to polar seas
" %an $e found up to 7000 m asl" &n seas, deep seas, ponds, la'es, rivers,
mudflats, terrestrial
" (conomic importance eg food, pearl, shellfor trin'ets
" Pests eg Toredo )ship*orms+ garden andvegeta$le pests
" ome are parasites, some medicinal use
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" %haracteristics of Phylum Mollusca
" -ody *ith mantle, mantle cavity, gills ,lungs and foot
" Marine, f*ater or terrestrial ha$itats
" .riplo$lastic $ody and $ilateral symmetry" %oelom limited to around heart
" %omple/ digestive system )radula, ciliary+
" ound, diagonal and longitud muscles" 1ervous system
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" ensory organs eg touch, smell, taste,vision, euili$rium
" e/ual reproduction
" #as one or t*o 'idneys
" -reathing thru lungs, gills, mantle or $odysurface
" pen circulatory system )$lood not
enclosed in vessels+
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" %lassification
" %lasses 3 %audofoveata
3 olenogastres
3 Polyplacophora 3 Monoplacophora )see diagram at 4ig 56!2+
3 astropoda )Pg 888+
3 %ephalopoda
3 -ivalvia
3 caphopoda
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" Phylum Annelida
" )annelus, latin little ring+, segmented*orms
" 5 000 sp
" (arth*orms and f*ater *orms )%l!ligochaeta+
" Leeches )%l! #irudinida+
" Marine *orms )%l! Polychaeta+
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" eneral features:
3 egments )metamerism+ 3 etae
3 Prostomium, peristomium, segmented
$ody and ends in pygidium 3 #ydrostatic s'eleton
3 %litellum
3 Peritonium )epithelium lining $ody *all+ 3 mesentries
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