Final Exam - Name Definitions Flashcards
Phylum Chordata:
vertebrates
Class Agnatha includes:
jawless ostracoderms and lampreys
Class Pacodermi includes:
primitive jawed fish
Class Chondricthyes includes:
sharks and rays, cartilaginous fish
Class Osteichthyes includes:
bony fish
Class Amphibia description:
Vertebrates with moist skin, gills and lungs, soft egg, which must be laid in water
Class Amphibia includes:
labyrinthodonts, salamanders, frogs, etc.
Class Reptilia includes:
lizards, snakes, turtles, dinosaurs, etc.
Class Aves includes:
birds
Class Mammalia includes:
warm, fuzzy, milk drinking creatures
Oldest undoubted fossils of vertebrate animals:
ostracoderms
ostracoderms are ____ and from the time of ____ from the locality _____.
small, jawless “fish” in Lower ordovician rocks in Colorado,
Ostracoderms description:
small, bilaterally symmetrical “fish” with an internal “skeleton” composed entirely of cartilage; no jaws or teeth in the mouth; tiny flat bony plates on the head (some types also had tiny elongate bony plates on posterior part of the body); originally restricted to oceanic habitats, but a few later types (in the Devonian) occurred in lakes.
Ostracoderms are found in water habitat?
oceanic, but a few later types (in the Devonian) occurred in lakes
What are ostracoderms composed of?
cartilage
Lobe finned fish includes:
coelacanth & lungfish
Ray finned fish includes:
most of our modern fish
Paleoniscoids includes:
sturgeons, paddlefish, etc.
Holosteans includes:
gars, bowfins, etc.
Teleosteans includes:
bass, sunfish, salmon, tuna, marlin, etc.
Conodonts:
Late cambrian to triassic; microscopic, phosphatic, tooth-like elements that occured in symmetrical pairs within a bilaterally symmetrical, soft-bodied animal; very widespread in the oceans, and very useful as biostratigraphic index fossils throughout most of the Paleozoic
What are Conodonts useful for?
Biostratigraphic index fossils throughout most of the Paleozoic
Myllokunmingia:
Early Cambrian; very tiny (<3 cm long), bilaterally symmetrical, totally soft bodied animal with a poorly defined head and an apparent notochord running the length of the body; carbonized fossils also contain an apparent mouth, gill pouches, dorsal & ventral fins, & V-shaped muscle bands
Oldest undoubted fossils of terrestrial, tetrapod, vertebrate animals:
Icthyostega & Acanthostega (labyrinthodonts)
