Systematic position Phylum: Chordata Class: Actinopterygii (Ray-finned fishes) Order: Perciformes (Perches) Family: Polynemidae (Threadfins) Genus: Eleutheronema Species: E. tetradactylum Synonyms Polynemus coecus Macleay, 1878 Polynemus teria Hamilton, 1822 Polynemus tetradactylus Shaw, 1804 Common/local names English: Fourfinger threadfin Bangladesh: Tailla (তাইল্ল্যা)