The hairhead sculpin (''Trichocottus brashnikovi'') is a species of marine

ray-finned fish Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that comprise over 50% of living vertebrate species. They are so called because of their lightly built fins made of webbings of sk ...

belonging to the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Cottidae The Cottidae are a family of fish in the superfamily Cottoidea, the sculpins. It is the largest sculpin family, with about 275 species in 70 genera.Kane, E. A. and T. E. Higham. (2012)Life in the flow lane: differences in pectoral fin morphology ...

, the typical

sculpin A sculpin is a type of fish that belongs to the superfamily Cottoidea in the order Perciformes.Kane, E. A. and T. E. Higham. (2012)Life in the flow lane: differences in pectoral fin morphology suggest transitions in station-holding demand acros ...

s. It is the only species in the

monospecific genus In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispe ...

''Trichocottus''.

Taxonomy

The hairhead sculpin was first formally described in 1915 by the Russian zoologists

Vladimir Konstantinovich Soldatov Vladimir Konstantinovich Soldatov (, 15 July 1875 – 31 January 1941) was a Russian and Soviet ichthyologist, zoologist, Doctor of Biological Sciences, professor of the Department of Ichthyology of the Moscow Technical Institute for the Fishery I ...

and

Mikhail Nikolaevich Pavlenko Michael is a common masculine given name derived from the Hebrew phrase ''mī kāʼēl'', 'Who slike-El', in Aramaic: ܡܝܟܐܝܠ (''Mīkhāʼēl'' ). The theophoric name is often read as a rhetorical question – "Who slike he Hebrew Go ...

with its type locality given as the

Strait of Tartary Strait of Tartary or Gulf of Tartary (; ; ; ) is a strait in the Pacific Ocean dividing the Russian island of Sakhalin from mainland Asia (South-East Russia), connecting the Sea of Okhotsk ( Nevelskoy Strait) on the north with the Sea of Japan ...

in the

Sea of Japan The Sea of Japan is the marginal sea between the Japanese archipelago, Sakhalin, the Korean Peninsula, and the mainland of the Russian Far East. The Japanese archipelago separates the sea from the Pacific Ocean. Like the Mediterranean Sea, it ...

. Soldatov and Pavlenko classified this species in the monospecific genus ''Trichocottus''. The 5th edition of ''

Fishes of the World ''Fishes of the World'' is a standard reference for the systematics of fishes. It was first written in 1976 by the American ichthyologist Joseph S. Nelson (1937–2011). Now in its fifth edition (2016), the work is a comprehensive overview of t ...

'' classifies this genus in the

subfamily In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus. Standard nomenclature rules end botanical subfamily names with "-oideae", and zo ...

Cottinae Cottinae is a subfamily of ray-finned fishes belonging to the Family (biology), family Cottidae, the typical sculpins. The subfamily has species throughout the northern hemisphere in both marine and freshwater habitats. Genera The following gener ...

of the family Cottidae but other authorities classify it in the subfamily

Psychrolutinae The fish family Psychrolutidae (commonly known as blobfishes, flathead sculpins, or tadpole sculpins) contains over 35 recognized species in 8 genera. This family consists of bottom-dwelling marine sculpins shaped like tadpoles, with large heads ...

of the family

Psychrolutidae The fish family Psychrolutidae (commonly known as blobfishes, flathead sculpins, or tadpole sculpins) contains over 35 recognized species in 8 genera. This family consists of bottom-dwelling marine sculpins shaped like tadpoles, with large heads ...

Etymology

The hairhead sculpin's genus name, ''Trichocottus'' prefixes '' Cottus'' with ''tricho'' which means "hair" or "ray", presumed to be an allusion to the many cirri on the head. The

specific name Specific name may refer to: * in Database management systems, a system-assigned name that is unique within a particular database In taxonomy, either of these two meanings, each with its own set of rules: * Specific name (botany), the two-part (bino ...

honours the Russian ichthyologist Vladimir Konstantinovich Bražnikov.

Description

The hairhead sculpin has a dark reddish brown head with a white spotted brown body, a white band around the

caudal peduncle Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported only ...

and a blackish base to the

pectoral fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish aquatic locomotion, swim. Apart from the tail or caudal fin, fish fins have no direct connection with the vertebral column ...

. In some adults this pattern is obscured by the development of whitish blotches and spots. There are no spines or bony knobs on the crown. The highest spine on the

preoperculum This glossary of ichthyology is a list of definitions of terms and concepts used in ichthyology, the study of fishes. A B C ...

is long and straight. The head, snout, jaws and the

lateral line The lateral line, also called the lateral line organ (LLO), is a system of sensory organs found in fish, used to detect movement, vibration, and pressure gradients in the surrounding water. The sensory ability is achieved via modified epithelia ...

bear many cirri. Scales are mostly absent, other than a few short, rows of prickly bony plates on the flanks which are partially obscured by the pectoral fin, these first appear in fishes with a

total length Fish measurement is the measuring of individual fish and various parts of their anatomies, for data used in many areas of ichthyology, including taxonomy and fishery biology. Overall length Standard length (SL) is the length of a fish measured f ...

of around . There are numerous small pores on the head, and these make it look granular. The lateral line on the trunk is straight, and is made up of three rows of pores. There are between 9 and 13 spines supporting the first

dorsal fin A dorsal fin is a fin on the back of most marine and freshwater vertebrates. Dorsal fins have evolved independently several times through convergent evolution adapting to marine environments, so the fins are not all homologous. They are found ...

, the second dorsal fin contains 15 or 16 soft rays and the

anal fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported o ...

has between 12 and 14 soft rays. The maximum published

is .

Distribution and habitat

The hairhead sculpin occurs in the northern Pacific Ocean, including the

Bering Sea The Bering Sea ( , ; rus, Бе́рингово мо́ре, r=Béringovo móre, p=ˈbʲerʲɪnɡəvə ˈmorʲe) is a marginal sea of the Northern Pacific Ocean. It forms, along with the Bering Strait, the divide between the two largest landmasse ...

, the

Sea of Okhotsk The Sea of Okhotsk; Historically also known as , or as ; ) is a marginal sea of the western Pacific Ocean. It is located between Russia's Kamchatka Peninsula on the east, the Kuril Islands on the southeast, Japan's island of Hokkaido on the sou ...

, and the northern

. It is a

demersal fish Demersal fish, also known as groundfish, live and feed on or near the bottom of seas or lakes (the demersal zone).Walrond Carl . "Coastal fish - Fish of the open sea floor"Te Ara - the Encyclopedia of New Zealand. Updated 2 March 2009 They oc ...

living along the sandy substrates of the seafloor at depths of up to .

References

{{Taxonbar, from=Q2119578 Cottinae Fish described in 1915