Equulites elongatus has an elongated body compared to its congeners but has the downward pointing, protractile mouth typical of the family Leiognathidae situated underneath the pointed snout.

They find E. elongatus modulating light output for intraspecific signaling.

[2] Equulites elongates is found in the Indo-West Pacific and has been recorded from northern Australia, Indonesia and Myanmar.

[1] Equulites elongates is a demersal species which is found in shallow waters to depths of 30 metres (98 ft) and is a gregarious species which is normally encountered inschools near the sea bed.

It feeds mainly on benthic invertebrates such as small crustaceans and polychaete worms as well as algae.