7-Teleostomi - AdvancedJawed Fishes:Part1 Teleostomes: Acanthodii& ClicktoeditMastersubtitlestyle

Click to edit Master subtitle style 9/14/10Advanced Jawed Fishes: Part 1Teleostomes:Acanthodii &Lecture 7: Chap 11, DOF

9/14/10SlingJAW WRASSE

9/14/10CarboniferousCamels often sit down carefully, perhaps their jointscreakrecentPersistent early oiling mightpreventperennial rust

9/14/10mnemonic devicesPERIODS (PALEOZOIC, MESOZOIC)Cambrian 540 to 505 myaOrdovician 505 to 438 myaSilurian 438 to 408 myaDevonian 408 to 360 myaCarboniferous 360 to 280 myaPermian 280 to 248 myaTriassic 248 to 208 myaJurassic 208 to 146 myaCretaceous146 to 65 myaEPOCHS (CENOZOIC)Paleocene 65-54 myaEocene 54-38 myaOligocene 38-24 myaMiocene 24-5 myaPliocene 5-1.8 mya

9/14/10Advanced Jawed Fished 1: Bonyfishes - TeleostomesBony fishes first appear in the fossil record in the Late Ordovician Teleostomes composed of three classes Acanthodians SarcopterygiansActinopterygians}Euteleostomi (Osteichthyes)

Click to edit Master subtitle style 9/14/10BONY FISH: 98% OF ALL LIVING VERTEBRATES ARE MEMBERS OF TELEOSTOMI (MANY NOT IN THE WATER) AND ALL VERTEBRATES EXCEPT

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9/14/10Class Acanthodii†

Class Acanthodii† “Spiny sharks”, but not sharksSmall salt and freshwater fishes (<20cm to 2.5m)Large eyesFlexible bodies covered with bony, rhombic scales Heavy spines in front of the fins. An opercular series covering the gills 3 orders, 9 families, 60 genera known

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9/14/10Outlasted Ostracoderms by 100

9/14/10Trends in AcanthodiiEarly forms had multiple gill covers, broad unembedded spines anterior to all fins except the caudal and between the pectoral and pelvic finsAdvanced forms with a single gill cover, ancillary paired spines are lost, other spines became smaller and embedded in musculatureSome specialized forms were toothless with long gill rakers (likely planktivorous)

9/14/10Why are Acanthodii considered advanced Have synapomorphies only seen in other advanced gnathostomes including: Three semicircular canalsOtolithsNeural and haemal arches with the unrestricted vertebral columnLateral line canalsOssified operculumBranchiostegals

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Term

Fall

Professor

Chakrabarty