Bio 201 F08 True lect 16 v2r

Bio 201 F08 True lect 16 v2r - Reproduction in...

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Reproduction in Chondrichthyes - internal fertilization Varying reproductive strategies in different species Oviparous = eggs w/yolk Viviparous = live young, placenta Ovoviviparous = no placenta, eggs held inside and eventually hatch inside female reproductive tract =>live young emerge http://www.dailymail.co.uk/sciencetech/article-544770/Storm-detecting- sharks-weather-forecasters-future.html Lemon Shark with young
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sharks & rays Tetrapods Ray fnned fshes (Actinopterygii) Lobe fnned fshes (Actinistia) Lungfshes (Dipnoi) Bony fsh diversifcation (Chondrichthyes) Sarcopterygii
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Ray fnned fshes (Actinopterygii) sharks & rays Lobe fnned fshes (Actinistia) Lungfshes (Dipnoi) Modern view: Class Sarcopterygii should also include tetrapods. Why? (Chondrichthyes) Sarcopterygii Tetrapods
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Bony fsh diversifcation • ~20-25,000 species, vast majority are ray-fnned species (~1/2 oF all vertebrate species) • Evolutionary success story: huge diversity – ±ound in almost all types oF aquatic habitats – Great size diversity (~1 cm to 6m) Dorsal fin (rays) Lateral line Pectoral fins Pelvic fins
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Smallest known fsh Paedocypris progenetica • Adults 7.9 mm (.31 in) • Head has lost skull bones • Discovered in 2006 in acidic peat swamp in Indonesia – Dark, tea-colored water, ph ~3 – Threatened by human deForestation activities • Member oF the carp Family (Cyprinidae)
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Bony fsh adaptations Swim bladder for buoyancy Air sac, adjustable by exchanging gas with blood Fish can stop moving and not sink (saves energy) Bony ±sh probably evolved in fresh water Swim bladder may have been a primitive lung for use in shallow water habitats Fins of ray-±nned ±shes Long ²exible rays of bone - good for maneuvering Most species have ²at, thin, lightweight scales For protection and ease of movement through water
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Reproduction
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This note was uploaded on 04/14/2009 for the course BIO 201 taught by Professor True during the Fall '08 term at SUNY Stony Brook.

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Bio 201 F08 True lect 16 v2r - Reproduction in...

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