Classification Phylum: Chordata Class: Actinopterygii (Ray-finned fishes) Order: Perciformes (Perches) Suborder: Gobioidei Family: Eleotridae (Eleotrididae) (Sleepers) Subfamily: Butinae Genus: Butis Species: B. butis Common name: Duckbill sleeper (IUCN Bangladesh, 2000) Synonyms Cheilodipterus butis (Hamilton, 1822) Eleotris butis (Hamilton, 1822) Distribution: