irrawaddy River shark

Only one shark has been found

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



Common NameGround Sharks

Family– Carcharhinidae 

Common NameRequiem Sharks




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.