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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 finned fishes (Actinopterygii) Lobe finned fishes (Actinistia) Lungfishes (Dipnoi) Bony fish diversification (Chondrichthyes) Sarcopterygii
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Ray finned fishes (Actinopterygii) sharks & rays Lobe finned fishes (Actinistia) Lungfishes (Dipnoi) Modern view: Class Sarcopterygii should also include tetrapods. Why? (Chondrichthyes) Sarcopterygii Tetrapods
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Bony fish diversification ~20-25,000 species, vast majority are ray-finned species (~1/2 of all vertebrate species) Evolutionary success story: huge diversity – Found 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 fish 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 fish adaptations Swim bladder for buoyancy Air sac, adjustable by exchanging gas with blood Fish can stop moving and not sink (saves energy) Bony fish probably evolved in fresh water Swim bladder may have been a primitive lung for use in shallow water habitats Fins of ray-finned fishes Long flexible rays of bone - good for maneuvering Most species have flat, thin, lightweight scales For protection and ease of movement through water
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Reproduction
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