L05_ancient_bony_fish11COLOR

L05_ancient_bony_fish11COLOR - PRIMITIVE BONY FISH...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
PRIMITIVE BONY FISH
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
SuperClass Gnathostomata - Jawed fishes Class Placodermi (plate-skinned) extinct Class Acanthodii (spiny sharks) Class Chondrichthyes Class Sarcopterygii living Class Actinopterygii
Background image of page 2
SuperClass Gnathostomata- Jawed fishes Class Chondrichthyes, sharks and rays Grade Teleostomi Class Acanthodii, extinct Class Sarcopterygii, lobed fins Class Actinopterygii, ray fins Last two classes included as Osteichthyes , “bony fishes” - now classified as Subgrade Euteleostomi
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Euteleostomi or Osteichthyes Appeared 425 mya during the Silurian Probably evolved initially in freshwater By 380 mya ago bony fishes were dominant Ostracoderms had just died out Acanthodians, placoderms, elasmobranchs were radiating at the same time so origins of bony fishes unclear Devonian, the ‘Age of fishes’
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Characteristics of bony fishes A) jawed B) true bony skeleton, can be secondarily lost C) bony operculum covering gill arches D) 3 semicircular canals, 3 otoliths E) paired fins F) lungs, or swimbladders in advanced forms, or lost in benthic forms G) lepidotrichia replace ceratotrichia during ontogeny; bony supports for fins, derived from scales
Background image of page 6
SuperClass Gnathostomata- Jawed fishes Class Sarcopterygii, lobed fins SubClass Coelacanthimorpha, coelacanths SubClass Dipnoi, lungfish “Tetrapodomorpha” including Osteolepidiformes, extinct - probably gave rise to tetrapods Class Actinopterygii, ray fins SubClass Cladistia (bichirs) SubClass Chondrostei (sturgeons, etc.) SubClass Neopterygii (everything else)
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
Class Sarcopterygii - lobed fins ! appeared 400+ mya ! marine and freshwater ! lobed = series of bony elements link fins to pelvic and pectoral girdle (like tetrapods) ! jaw suspension is autostylic (holostylic) ! cosmine = complex tissue covers scales (layers of dentine covered by enamel w/ pore-canal system)
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Primitive sharks Chondrichthyes and actinopterygians Non-fish vertebrates Lungfish Ratfish IIII = Ligament suspension Amphistylic suspension Hyostylic suspension Autostylic or holostylic suspension Orbital process Palatoquadrate Chondrocranium Otic process Hyoid arch Columella in
Background image of page 10
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/10/2012 for the course EEMB 106 taught by Professor Staff during the Spring '08 term at UCSB.

Page1 / 41

L05_ancient_bony_fish11COLOR - PRIMITIVE BONY FISH...

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online