13-Elopomorpha - Elopomorpha (Teleostei) Lec-13; Chap 14...

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Click to edit Master subtitle style9/14/10Elopomorpha(Teleostei)Lec-13; Chap 14 DOF
Click to edit Master subtitle style9/14/10Elopomorpha(Teleostei)Lec-13; Chap 14 DOF
9/14/10Elopomorpha(Teleostei)
9/14/10Elopomorpha: eels andtarponsElopiformes(8 spp.): Elopidae andMegalopidaeAlbuliformes(30 spp.): Albulidae,Halosauridae,NotacanthidaeAnguilliformes(738spp): Anguillidae,Muraenidae, Ophichthidae, Congridae and 11others.Saccopharyngiformes(28):Saccopharyngidae and 3 others
9/14/10ElopomorphaMostly marine, fossils dating back to theJurassic4 orders, 25 families and about 804 species
9/14/10ElopomorphaExtremely diverse morphologically,include tarpons, bonefishes, true eels,gulpers and spiny eels.
9/14/10ElopomorphaAll linked together by a leptocephaluslarvae
9/14/10Leptocephalus- larvaePlanktonic larvae – they are thin,transparent, and leaflike drifting passivelywith currents.Leaflike body shape allows absorption ofdissolved organic matter
9/14/10Leptocephalus larva
9/14/10Leptocephalus- larvaeOnce thought to comprise its owntaxonomic groupCan live 2-3 years in some anguillidspeciesLack of red blood cells make themtranslucent
9/14/10Leptocephalie - larvaeAll Elopomorpha have leptocephaluslarvae, although they are distinctiveElopiform larvae have a forked tail anda distinct dorsal fin, eel larvae have arounded “tail” that merges with anelongate dorsal fin.
9/14/10Diversity of
9/14/10ElopomorphaAll shallow water tropical or subtropicalmarine forms that occasionally enterfresh or brackish water
9/14/10ElopomorphaHave thin, riblike, epipleuralintermuscular bones that extend from thevertebral column to the surrounding trunkmusculature.These are the small bones in the meat ofprimitive teleosts that make them difficultto fillet and eat.
9/14/10Subdivision ElopomorphaOrder Elopiformes (tarpons, ladyfishes)Order Albuliformes (bonefishes, spiny eels)Order Anguilliformes (eels)Order Saccopharyngiformes (gulpers)
9/14/10ElopiformesPrimitive features(1)gular bone on the underside of throat, lost in all other advanced teleosts;(1)High number of branchiostegals rays in the throat (10-35 vs 5-7 mostadvanced forms);(3) Inclusion of the maxilla in the gape, two biting bones in the upper jawrather than one(4) Heavy ganoin scales (found in gar and bichirs)
9/14/10ElopiformesEights species, two familiesAll streamlined, predatory fish withlarge cycloid scales and deeply forkedtailsGular bone presentHeavy bony ganoin scalesFemales can have >12 million eggsPelagic fishes that superficiallyresemble herring
9/14/10ElopiformesElopidaeMegalopidaeLady fishes;tenpoundersTarpon

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Term
Fall
Professor
Chakrabarty
Tags
Ichthyology, EEL, spiny eels, Moray eels, true eels

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