shark shark extremely rare species requiem shark family small gray shark grows longer fairly long pointed snout species identified shape upper teeth strongly near base smooth edged near tip dorsal fin large long free rear tip furthermore shark prominent black tips pectoral fins second dorsal fin caudal fin lower lobe shark found coastal waters new_guinea known enter fresh water currently known sightings species 1980s rivers sri_lanka fewer specimens available study aspects natural history unknown probably feeds bony fishes cephalopods crustaceans gives birth live young embryos forming connection mother listed shark critically endangered probably threatened intense escalating fishing pressure range taxonomy scientific description shark authored german der account based long immature male india region attributed new species french zoologist specific epithet derived greek half tooth elevated rank genus placed shark genus based relative positions dorsal pectoral fins subsequent authors generally accepted gill revision second species known followed earlier taxonomic work common shark long shark phylogeny evolutionary relationships shark uncertain study based morphological data tentatively grouped shark shark shark creek shark borneo shark shark description shark robust build moderately long pointed snout large circular eyes equipped membranes broad small narrow shaped lobe anterior rim arched mouth lacks conspicuous furrows enlarged pores corners upper lower jaws contain tooth rows respectively addition rows small teeth upper lower jaw upper teeth single narrow smooth edged central flanked sides large lower teeth narrower upright smooth finely pairs gill slits fairly long originating fourth pair gill slits pectoral fins short broad shaped pointed tips dorsal fin tall long free rear tip positioned pectoral fin bases second dorsal fin large tall notably elongated free rear tip positioned slightly anal fin usually ridge dorsal fins present ridge slight caudal deep crescent shaped notch upper caudal fin origin caudal fin developed lower lobe longer upper lobe notch trailing margin near tip skin covered overlapping dermal denticles horizontal ridges leading rarely marginal teeth species gray white obvious pale stripe flanks pectoral fins second dorsal fin lower caudal fin lobe prominently tipped black dorsal fin dorsal caudal fin lobe narrowly edged black maximum size reached shark uncertain lack large specimens probably greater distribution habitat shark appears broadly distributed common reportedly regular catch india pakistan extremely rare known specimens collected india specimens java reliable records parts southeast_asia vietnam philippines new_guinea northern australia species inhabits waters older sources reported found rivers reports confused river shark shark accurate suggest species tolerant low reports confirmed documented sharks 21st century found river biology ecology diet shark thought consist small bony fishes cephalopods crustaceans parasite documented species like requiem sharks viviparous developing embryos sustained term connection mother specific details unknown smallest known specimen female long close birth size sexual maturity attained length human interactions harmless humans shark caught meat fewer specimens deposited museum collections collected prior shark rarity originally led fears possibly extinct shark rediscovered rivers photographs species exist taken group nature taken freshwater fish survey given commercial fishing activity range heavy intensifying listed shark critically endangered placed high priority locating surviving populations
Pondicherry shark