post13-Elopomorpha_2015 2 - Elopomorph a (Teleostei)...

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Elopomorpha(Teleostei)Lec-13; Chap 14 DOF
Assignment 2!November 2 – register yourself andspecies with ADW by this dateBut submit docx file to me by Nov 2.
Assignment 2 RubricSpelling, poor grammar- 2Not having actual copy of originaldescription– 2Not having at least 10 references fromjournals, most should be recent2Not having most ADW sections filled in(Geographic Range, Habitat, etc.)– 2Miscellaneous– 2
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Elopomorpha(Teleostei)
Elopomorpha: eels andtarponsElopiformes(8 spp.): Elopidae andMegalopidaeAlbuliformes(30 spp.): Albulidae,Halosauridae,NotacanthidaeAnguilliformes(738spp):Anguillidae, Muraenidae, Ophichthidae,Congridae and 11 others.Saccopharyngiformes(28 spp.):Saccopharyngidae and 3 others
Elopomorpha(Teleostei)Mostly marine, fossils dating back to theJurassic4 orders, 25 families and about 804 species
Elopomorpha(Teleostei)Extremely diverse morphologically,include tarpons, bonefishes, true eels,gulpers and spiny eels.
Elopomorpha(Teleostei)All linked together by a leptocephaluslarvae
Leptocephalus- larvaeElopomorpha (Teleostei)Larvae – they are thin, transparent, andleaflike – once thought to be driftingpassively with currents (planktonic).Actually fairly active swimmers.Leaflike body shape allows absorption ofdissolved organic matter
Leptocephalus- larvaeElopomorpha (Teleostei)Once thought to comprise its owntaxonomic groupCan live 2-3 years in some anguillidspeciesLack of red blood cells make themtranslucent
Leptocephalie - larvaeElopomorpha (Teleostei)All 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.
Diversity ofLeptocephali
Elopomorpha(Teleostei)All shallow water tropical or subtropicalmarine forms that occasionally enterfresh or brackish water64579159
Elopomorpha(Teleostei)Have 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.
Subdivision ElopomorphaOrder Elopiformes (tarpons, ladyfishes)Order Albuliformes (bonefishes, spiny eels)Order Anguilliformes (eels)Order Saccopharyngiformes (gulpers)
Elopiformes (Teleostei:Elopomorpha)Primitive features(1)gular bone on the underside of throat, lost in all other advanced teleosts;(2)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)
Elopiformes(Teleostei:Elopomorpha)Eights species, two familiesAll streamlined, predatory fish withlarge cycloid scales and deeply forkedtailsFemales can have >12 million eggsPelagic fishes that superficiallyresemble herring

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Term
Fall
Professor
Chakrabarty
Tags
Ichthyology, EEL, spiny eels, Elopomorpha, Muraenidae, Tarpon

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