Hagfish, Lamprey, Sharks, Rays, etc Flashcards
(37 cards)
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
14
Q
Squaliformes
A
- spiny dogfish
- cookiecutter shark
15
Q
the more well known sharks belong to which order?
A
Galeomorphii
16
Q
Galeomorphii shark orders
A
- Heterodontiforms
- Lamniformes
- Orectolobiformes
- Carenarhiniformes
17
Q
Heterodontiforms
A
- horn sharks
- 8 species - all marine
18
Q
Lamniformes
A
- 7 families, 15 species
- sand tigers, threshers, mackerels, goblins, basking sharks
19
Q
Megamind Shark
A
deep ram-feeding planktivore
20
Q
Orectolobiformes
A
- whale sharks
- nurse sharks
- wobbegongs
21
Q
Carenarhiniformes
A
- 225 species
- bull, blue, hammerhead, cat, & requiem sharks
22
Q
Batoidea
A
- skates & rays
- pectoral fin fused to head
- dorsoventral flattened
- whip like tail
- anal fin reduced or absent
23
Batoidea ecology & life history
- primarily marine
- skates abundant in deep water
- rays inshore tropical
- mollusk & plankton feeders
- slow growth
- internal fertilization claspers
24
Batoidea locomotion
rajiform
25
exceptions to Batoidea locomotion
eagle rays & manta rays flap fins
26
4 orders of Batoidea
- Torpediniformes
- Rhinopristiformes
- Myliobatiformes
- Rajiformes
27
Torpediniformes
electric rays
28
Rhinopristiformes
- shovelnose rays & allies
- sawfishes
- guitarfishes
29
Myliobatiformes
stingrays & allies
30
Rajiformes
skates
31
Torpediniforms description
- torpedo electric rays
- piscivorous
- Atlantic, Mediterranean, Australia, NZ
32
Rajiforms description
- kite shaped
- oviparous
33
Myliobatiforms description
- kite shaped
- viviparous
34
Holocephali
- chimaeras & ratfishes
- pelvic claspers
- bottom dwelling
- mollusk & crustacean eaters
35
value of sharks
- tourism
- keystone species
- health of coral reefs
