''Platytropius siamensis'' was a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

schilbid catfish Schilbeidae is a family of catfishes native to Africa and Asia. These fish tend to swim in open water. Schilbid catfishes usually have dorsal fins with a short base and a spine, but '' Parailia'' lack a dorsal fin altogether. Most species also p ...

( order Siluriformes)

family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...

Schilbeidae Schilbeidae is a family of catfishes native to Africa and Asia. These fish tend to swim in open water. Schilbid catfishes usually have dorsal fins with a short base and a spine, but '' Parailia'' lack a dorsal fin altogether. Most species also ...

. It originated from the

Chao Phraya The Chao Phraya ( or ; th, แม่น้ำเจ้าพระยา, , or ) is the major river in Thailand, with its low alluvial plain forming the centre of the country. It flows through Bangkok and then into the Gulf of Thailand. E ...

and

Bang Pakong River The Bang Pakong ( th, แม่น้ำบางปะกง, , ) is a river in east Thailand. The river originates at the confluence of the Phra Prong River and the Hanuman River near Kabin Buri, Prachinburi Province. It empties after 231 k ...

s in

Thailand Thailand ( ), historically known as Siam () and officially the Kingdom of Thailand, is a country in Southeast Asia, located at the centre of the Indochinese Peninsula, spanning , with a population of almost 70 million. The country is b ...

. It inhabited lower to middle reaches, mainstreams, tributaries, and larger marshlands. The species has been declared extinct in 2011 by the IUCN Red List of Threatened Species, because despite periodic surveys it has not been encountered since 1975–1977. ''P. siamensis'' was carnivorous, feeding on

insect Insects (from Latin ') are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body ( head, thorax and abdomen), three ...

s and shrimps. This species was oviparous and eggs were unguarded. It could grow to a length of 20.0 cm (7.9 in) TL.

References

Schilbeidae Fish of Asia Fish of Thailand Taxa named by Henri Émile Sauvage Fish described in 1883 {{catfish-stub