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Flashcards in Lecture 3 Deck (5)
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1
Q

What are cyclostomes?

A

Hagfish and Lampreys

cyclostomes means round mouths

2
Q

Give some diagnostic features of hagfish

A
No elaborate skull
1 or 2 comment external gill pores
1 semicircular canal
No dorsal fin
Adult heart without nervous system 
Atrium and ventricle not closely set 
Blood isotonic with water
3
Q

Give some diagnostic features of lampreys

A
Slightly elaborate skulls 
Single dorsal nostril atop the head 
7 pairs of separated external gill slits
2 semicircular canals 
Extrinsic eye muscles 
Simple vertebrate 
Anterior and posterior dorsal fins
4
Q

Features lampreys and jawed vertebrates share

A
Vertebrae
Elaborate skulls
Extrinsic eye muscles 
Closely set atrium and ventricle 
At least 2 semicircular canals 
Neuromasts
5
Q

What are the functions of vertebrae?

A

Support
Protection
Movement
Mineral storage