ElasmobranchBiologyElasmobranchBiologyElasmobranch:AnyofnumerousfishesoftheclassElasmobranch:AnyofnumerousfishesoftheclassChondrichthyes,characterizedbyacartilaginousskeletonandChondrichthyes,characterizedbyacartilaginousskeletonandplacoidscalesandincludingthesharks,rays,andskates.placoidscalesandincludingthesharks,rays,andskates.FLORIDAPROGRAMFORSHARKRESEARCHFloridaMuseumofNaturalHistory鲨鱼-软骨鱼类生物TopicsTopics•BasicMorphologyBasicMorphology•SensesSenses•DigestionsystemDigestionsystem•CirculatorysystemCirculatorysystem•OsmoregulationOsmoregulation•ReproductionsystemReproductionsystem•EvolutionaryadaptationsEvolutionaryadaptations•Thereareapproximately400describedspeciesofsharks.Thereareapproximately400describedspeciesofsharks.•Additionally,therearearound400speciesofbatoidsAdditionally,therearearound400speciesofbatoids(raysandskates).(raysandskates).Whendidsharksfirstappear?Whendidsharksfirstappear?•SharksandtheirancestorsfirstappearedinthelateSharksandtheirancestorsfirstappearedinthelateSilurian/earlyDevonian,oraround400millionyearsago.Silurian/earlyDevonian,oraround400millionyearsago.•Sharkspredatedinosaursby200millionyears.Sharkspredatedinosaursby200millionyears.BodyPlanBodyPlanElasmobranchSensesElasmobranchSensesElasmobranchSensesElasmobranchSensesOlfactory(Smell):Olfactory(Smell):•HighlyacutesenseofsmellHighlyacutesenseofsmell•UsedtolocatefoodorpotentialmatesUsedtolocatefoodorpotentialmates•PairedopeningswithorwithoutaPairedopeningswithorwithoutaconnectiontothemouthconnectiontothemouth•NotusedforrespirationNotusedforrespiration•LackexternalearsLackexternalears•GoodsenseofhearingespeciallyintheGoodsenseofhearingespeciallyinthelowerfrequencyrangelowerfrequencyrange•OftenfirstsensetodetectpreyfromOftenfirstsensetodetectpreyfromadistanceadistanceElasmobranchSensesElasmobranchSensesSound:Sound:ElasmobranchSensesElasmobranchSensesPressure:Pressure:•Sharks,likeotherfish,Sharks,likeotherfish,havealaterallinesystemhavealaterallinesystemthatcan...
