Maximum length is. The head is broad and flattened, the eyes are large and widely separated, and the mouth is curved with fleshy lips. There is no spine in front of the operculum, the branchiostegal membranes are fused to the isthmus, and there are many small cirri scattered over the head and body. The operculum is poorly ossified and is covered by a gelatinous layer. Behind the head, the body tapers rapidly to the caudal peduncle and there is a gelatinous layer between the skin and the muscle. The dorsal fin has eight spines and nineteen to twenty soft rays, and the anal fin has no spines and twelve to fourteen soft rays. The pectoral fins are broad and in larger individuals, have fleshy pads near their tips. The upper parts of this fish are grey or black and the underparts pale, with some indistinct mottling.
Distribution
The blob sculpin is native to the northeastern Pacific Ocean where it is found on or near the seabed at depths from.
Ecology
Aggregations of blob sculpins have been observed by using a remotely operated underwater vehicle. The fish were at depths between on the Gorda Escarpment off the coast of California. They were brooding large pinkish eggs in nests, actually lying on the eggs or in contact with them in many instances. The eggs were free of sediment which makes it likely the adults were actively fanning them, the first known example of parental care in egg-laying deep sea fishes. Scattered around and among the sculpins were octopuses in the genus Graneledone, also brooding their eggs. About half the octopuses were within 5 metres of an adult or breeding sculpin. At one site, 84 sculpins and 64 nests were observed as well as numerous brooding octopuses; the researchers described it as a "reproductive hot spot". The diet of this fish consists mainly of such invertebrates as sea pens, crustaceans and gastropod molluscs. Other items consumed include cephalopods, crinoids, sea cucumbers and fish. Some of the species of fish are pelagic but researchers think they must have been swimming close to the seabed when consumed because the morphology of the blob sculpin is typical of a bottom dwelling fish. It is the host of skin parasites such as the copepods Chondracanthus yanezi and Neobrachiella amphipacifica.
