Dibrachichthys

Dibrachichthys was first proposed as a genus in 2009 by Theodore Wells Pietsch III, Jeffrey W. Johnson and Rachel J. Arnold when they described Dibrachichthys melanurus. The type locality of the new species was given as 11°06.9'S, 142°51.9'E, northeast of Ussher Point on the Cape York Peninsula in Queensland. This genus is one of two genera, both monotypic, in the family Tetrabrachiidae. The Tetrabrachiidae is classified within the suborder Antennarioidei within the order Lophiiformes, the anglerfishes. ==Etymology==

Dibrachichthys combines di, meaning "two", brachium, meaning "arm", and ichthys, which means "fish". This is an allusion to the possession of a single undivided pectoral fin on each side, in contrast to the split pectoral fins of the only other species in the Tetrabrachiidae, Tetrabrachium ocellatum which has its pectoral fins divided. The specific name melanurus means "blacktail", and is a reference to the black bar on the base of the caudal fin. ==Description==

Dibrachichthys has its dorsal fin supported by 14 or 15 soft rays and the anal fin is supported by between 8 and 10 soft rays. It is very similar to T. ocellatum but has a single, non divided pectoral fin on each side instead of ''T. ocellatum's split pectoral fins. The cranium is markedly wider than that of T. ocellatum'' and some of the skull bones form a horizontal tube-like structure to the front of each eye. The eyes are set in a deep semi-circular protective cavity and there is a deep depression in the middle of the cranium. The coloration is different too with a dark inside of the mouth, a dark bar on the back just below the base of the dorsal fin and a dark bar on the base of the caudal fin. Males have a maximum published standard length of , while females are slightly smaller with a maximum published standard length of . ==Distribution and habitat==

Dibrachichthys is found in the Australia, Papua New Guinea and Indonesia. This is a demersal fish found at depths between , although two specimens were collected between , on soft substrates of sand and mud in nearshore waters and in areas with rubble on the continental shelf. ==Biology==

Dibrachichthys appears to be solitary and individuals are widely dispersed. ==References==