lab quiz 1 stations 21-45

lab quiz 1 stations 21-45 - Station 21 Class- Osteichtyes...

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Station 21 Class- Osteichtyes Subclass- Actinopterygii Superorder: Neopterygii In this superorder (Neopterygii) changes in the skull allowed for: - increased jaw mobility and offered attachment sites for feeding musculature What feature did this superorder lose? - spiracle What became greatly reduced in size, rounder, and thinner? - ganoid scales What was the notochord replaced by? - ossified vertebrae, in which the ganoid scales and this aided in more active swimming What are the 2 primitive living neopterygians? - Lepisosteiformes - Amiiformes - both have more flexible jaws than palaeoniscoids, but less flexible than advanced neopterygians What are derived neopterygians generally called? - teleosts What characteristics doe the teleosts share? - homocercal tail - circular scales without ganoine - ossified vertebrae - swim bladder - skull with complex jaw mobility allowing for rapid capture of food Homocercal means: - homos=the same + keros=tail Station 22 Class- Osteichthyes Subclass- Sarcopterygii “lobe-finned fish” Sarcopterygians gave rise to what first terrestrial vertebrates?
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- tetrapods What feature do they possess that open internally to the mouth? And through what holes? - external nostrils - choanae What kind of swimbladder to sarcopterygians have? - bi-lobed swim bladder What bone, that was retained in most tetrapods, do lobe-finned fish also have? - Clavicles In addition to having fleshy fins, how do primitive sarcopterygians differ from other bony fishes? - have cosmoid scales What kind of tails did early species have? - heterocercal tails The caudal fin became symmetrical and ….? - diphycercal Station 23 Class- Osteichthyes Subclass- sarcopterygii Superorder Actinistia (Coelacanthiformes) The discovery of one of these off the coast of South Africa provided what? -
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lab quiz 1 stations 21-45 - Station 21 Class- Osteichtyes...

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