Agnatha Flashcards
1
Q
Yunnanozoa evidence
A
Pharyngeal arches likely form vertebrae, jaws and braincases
2
Q
Conodonts
A
Enamel covered teeth
3
Q
Ostracoderm
A
mouth with no jaw
electric senses, the bony front part of the skin
small, paired fins, cartilage vertebrae
4
Q
Myxiniformes – Hagfish
A
no jaw, no bone, no vertebrae, keratin teeth
No lateral line, cartilage skull
12 gill slits and 1 semicircular canal
reproduction 1-30 eggs
Programmed genome rearrangment
5
Q
How do hagfish deal with their own mucous
A
They simply go anoxic
Can go 36 hours with no oxygen
6
Q
Lamprey
A
no jaw
cartilage
1 or 2 dorsal fins
7-9 gill slits
lateral line
2 semicircular canals
highest chromosome
larvae can filter feed on the bottom of the river (derived)
adults parasitize larger fish
