Term
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Definition
1. all of chordate characteristics, plus...
2. cranium
3. 3 part brain (hind-, mid-, fore-)
4. neural crest cells
5. paired external sense organs (eyes, ears, etc.)
6. mineralized tissue (cartilage and/or bone)
7. At least 2 semicircular canals (most have 3) |
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Term
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Definition
1. Agnathans (more primitive; ex. ostracoderms, lampreys, hagfish)
2. Gnathostomes (have jaws; ex. everything else!) |
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Term
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Definition
| EXTINCT, marine filter-feeders who were very heavy because of the bony plates in their skin so they stayed at the bottom (asymmetrical tails) |
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Term
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Definition
-extant (living now)
-parasitic
-marine and freshwater
-gills
-notochord throughout life |
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Term
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Definition
-larval lamprey
-filter feeders (unlike parasitic lampreys) |
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Term
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Definition
-marine scavengers
-no jaws, produce lots of mucus
-no bone
-vestigial eyes |
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Term
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Definition
1. heterocercal (asymmetrical, dorsal spine)
2. hypocercal (asymmetrical, ventral spine)
3. diphycercal (symmetrical)
4. homocercal (looks symmetrical, spine is dorsal) |
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Term
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Definition
| animals with jaws (placederms, cart. fish, bony fish, labyrinthodonts, amphibians, reptiles, birds, mammals) |
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Term
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Definition
-extinct
-bony armors, bigger than ostracoderms
-no teeth but bony beak |
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Term
| class chonricthyes, and two subclasses |
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Definition
cartilagenous fish:
1. elasmobrachii (sharks, rays, skates)
2. holocephali (chimeras or rat fish) |
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Term
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Definition
| found in chondrichthyes, transfers sperm to females for internal fertilization |
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Term
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Definition
| lots of yolk (nutrients from here and not from the mother) |
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Term
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Definition
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Term
| chondrichthyes characteristics |
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Definition
-no lungs or swim bladder
-spiracle ("water in" for respiration)
-heterocercal tails |
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Term
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Definition
| eggs layed outside of the mother's body, large and yolky (skates) |
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Term
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Definition
| eggs in mother's body and develop in uterus from mother's nutrients; young are born alive |
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Term
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Definition
| eggs are in the mother's body but young develop in the egg and then are born alive |
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Term
| class osteichthyes, and 2 subclasses |
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Definition
bony fish:
1. actinopterygii (ray-finned fish like nemo)
2. sarcopterygii (lobed-finned fish) |
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Term
| osteichtheyes characteristics |
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Definition
-have air sac (lung or swim bladder)
-bony fin rays probably evolved from dermal scales |
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Term
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Definition
| all extinct, gave rise to tetrapods |
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