Hagfish, Lamprey, Sharks, Rays, etc Flashcards
1
Q
Class Myxini - controversial relationship
A
- partial cranium
- no jaws (agnathan)
- round buccal cavity, rasping teeth, & tongue
- four hearts
- slime glands & pores
- one semicircular canals
2
Q
Class Myxini - distribution
A
- world wide
- cold marine
- 43 species
3
Q
Class Myxini - characteristics
A
- single gonad
- tests & ovaries present in immature but only one develops at maturity
- iteroparous
- direct development
- few, large eggs
- scavenger feeders
3
Q
Class Petromyzontida
A
- lampreys
- parasitic & nonparasitic species
- Ammocoete larvae
3
Q
Petromyzontida morphological features
A
- round buccal cavity with rasping teeth
- largest diploid vertebrate chromosome number
- pharyngeal gill openings
- better developed eyes
- semelparous
- indirect development
4
Q
Petromyzontida diversity & distribution
A
- worldwide, Northern latitudes
- non parasitic freshwater
- parasitic freshwater & anadromous
5
Q
Ohio Lamprey species
A
- sea
- silver
- ohio
- northern brook
- mountain brook
- least brook
- american brook
6
Q
Class Chondrichthyes morphological features
A
- cartilaginous skeleton
- jaws
- true teeth
- placoid scales
- heterocercal tail
- ceratotrichial fins
- 5-7 external gill slits
- claspers in males
7
Q
Chondrichthyes life history attributes
A
- slow growth & maturity
- internal fertilization
- few large eggs
- viviparity ancestral
- ovoviviparity
- oviparity
- carnivorous
8
Q
viviparity ancestral
A
- Lecithotropy
- Matrotrophy
9
Q
Lecithotrophy
A
yolk sac
10
Q
Matrotrophy
A
- uterine secretions
- oophagy
- embryophagy
11
Q
Hexanchiforms
A
- sixgill sharks
- sevengill sharks
- frill shark
12
Q
Pristiophoriformes
A
saw sharks
13
Q
Squatiniforms
A
angel sharks
