The Irrawaddy River shark (Glyphis siamensis) is a river shark in the family Carcharhinidae. It is extremely rare, and critically endangered. Only one shark has been found in the Irrawaddy River mouth.
Family: Carcharhinidae – Requiem sharks
Genus: glyphis
Species: siamensis
Phylum– Chordata
Class– Chondrichthyles
Subclass– Elasmobranchii
Common Name– Ground Sharks
Family– Carcharhinidae
Common Name– Requiem Sharks
Genus– Glyphis
Species– siamensis
Status: IUCN Red List CRITICALLY ENDANGERED
Average Size and Length: The only known specimen of the Irrawaddy River shark was 60 cm long, and scientists believe that they could possibly reach 100 to 300 cm.
Teeth and Jaw: The upper teeth have broad, high, serrated triangular cusps. The first few lower front teeth have weakly serrated cutting edges and low cusplets on crown foot.
Head: Broadly rounded short snout and small eyes.
Demographic, Distribution, Habitat, Environment and Range: The Irrawaddy River shark is found in the Irrawaddy River mouth of Myanmar in the Indian Ocean. Research success it lives in rivers or estuaries.
Aesthetic Identification: The Irrawaddy River shark has a stocky build. It is Grey-brown above, and counter-shaded white below. There is no interdorsal ridge. There is a longitudinal upper precaudal pit. The first dorsal fin originates over the rear ends of the of the pectoral bases. The second dorsal fin is about half the height of the first anal fin. It has a deeply notched posterior margin.
Irrawaddy River Shark Recorded Attacks on Humans: No threat to humans whatsoever.