review for lab practical I

Hemichordate

• Kingdom: Animalia. Phylum: Hemichordata. Class: Enteropneusta. Genus: Balanoglossus.

• Acorn worm• Dioecious – separate male and

female

Can you find the……

Proboscis

Proboscis coelom

Collar Collar coelom

Dorsal blood vessel(and nerve)

Ventral blood vessel(and nerve)

Stomochord

This is a cross section of? Balanoglossus pharynx

This is a cross section of….?Balanoglossus intestines

Figure 2.2 aFigure 2.2 b

Urochordata

• Phylum Chordata. Subphylum Urochordata. Class Ascidiacea.

• Tunicates• Ecteinascidia• Monoecious = one house– Both male and female parts in one organism.

Can you find the…?

•Buccal/Incurrent siphon

•Atrial/excurrent siphon

•Tunic

•Stomach

•Intestine

•Rectum

•Anus

•Testes

•Ovary

•Pharynx

•Pharyngeal slits

•Endostyle

Incurrent/Buccal SiphonExcurrent/Atrial siphon

Tunic

Anus

Rectum

Ovaries

Stomach

Pharynx

Pharyngeal slits

Endostyle

Testes

Intestine

??

??

??

??

Also note: Excurrent and Incurrent siphonsBranchial basket w/ pharyngeal slits Adhesive papilla

??Post Anal tail

??

??

Esophagus

Testes

Ovaries

Intestine

Stomach

Stigmata

Endostyle

Cephalochordata

• Phylum: chordata, Subphylum: cephalochordata, Class: Leptocardii

• Amphioxus • Lancelets

Find the…

Find the…

•Dorsal hollow nerve cord

•Notochord

•Wheel organ

Male or female?Female

Find the…• DHNC

•Notochord

•Pharynx

•Endostyle

•Gonad

•Segmental muscle

•Dorsal fin

•Epibranchial groove

What is… 1. Dorsal fin

2. DHNC

3. Notochord

4. Intestine

5. Ventral fin

** If you can see the dorsal AND ventral fins, Chances are it’s an intestinal region!!

Identify: 1. Dorsal fin2. Dorsal nerve cord3. Notochord4. (Rostrum) 5. Oral hood6. Wheel organ7. Oral Cirri8. Velum

Agnathans

• Phylum: chordata, Subphylum: Vertebrata, Class: Cephalaspidomorphi, Order: Petromyzontiformes, Genus: Petromyzon

• Jawless• Lampreys

External features to identify:

Nostril

Caudal Fin

Tail Dorsal fins

Trunk

External gill slit

Eye

Buccal Cavity

Where the pineal gland should be.

What can you identify?

**Hypophyseal pouch

Identify…

Spinal cord

Notochord

Caudal artery

Caudal vein

Spinal cord

Notochord

Esophagus

BranchialTube

Ventral aorta

Gill Laminae

Anterior Cardinal

Vein

Olfactory sac

Hypophyseal pouch

Cranial cartilage

Carotid artery

Eye

Eye muscle

Papillae

Tooth

Tongue

Notochord

Posterior cardinal vein

Liver

Dorsal aorta

Spinal cord

Testes

Myomeres

Liver

Intestine

Male. Testes. Female. Ovaries.

Eye spotEar vesicle

Gill slits

VelumOral tentacles

Procencephalon

**Look for the eye spot.**

NotochordNerve cord Dorsal fin

IntestineEsophagusGill slits