Triglops

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Triglops
Triglops metopias.jpg
Alaska Sculpin (T. metopias)
Triglops pingelii.jpg
Ribbed Sculpin (T. pingelii)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Scorpaeniformes
Family: Cottidae
Subfamily: Cottinae
Genus: Triglops
J. C. H. Reinhardt, 1830
Type species
Triglops pingelii
Reinhardt, 1837 [1]
Synonyms [1]

Triglops is a genus of marine ray-finned fishes belonging to the family Cottidae, the typical sculpins. These fishes are found in the North Pacific, Arctic and North Atlantic Oceans.

Contents

Taxonomy

Triglops was first proposed as a monospecific subgenus of Cottus in 1830 by the Danish zoologist Johan Reinhardt when he described Triglops pingelii, [1] giving its type locality as Quanneoen, south of Frederikshaab in western Greenland. [2] The 5th edition of Fishes of the World classifies the genus Triglops within the subfamily Cottinae of the family Cottidae, [3] however, other authors classify the genus within the subfamily Triglopinae of the family Psychrolutidae. [1]

Species

Triglops currently contains 10 recognized species in this genus: [4]

Characteristics

Triglops sculpins have slender, elongate, cylindrical to compressed or flattened bodies with a small head, which may also be slightly depressed or compressed, with a small horizontal or slightly oblique mouth. They have clearly separated dorsal fins, the first containing between 9 and 13 slender spines and the second having between 19 and 31 soft rays. The anal fin is supported by 18 to 32 soft rays. [5] This genus is distinguished from the other marine sculpin genera by having the anus positioned halfway between the origins of the pelvic and anal fins, a feature shared with the genera Clinocottus and Leiocottus . The lateral line is made up of large scales which resemble plates and the scales underneath these form obvious rows of very small serrated plates, these are within close-set diagonal skin folds, a feature shared solely with Jordania . There are four preopercular spines and the branchiostegal membranes are joined but do not connect to the isthmus. They have vomerine teeth but no palatine teeth. The pelvic fin has a single spine and three soft rays. There are no cutaneous cirri on the head. [6] The fishes in this genus range from a maximum published standard length of 9.7 cm (3.8 in) in T. xenostethus up to 30.8 cm (12.1 in) in T. scepticus. [4]

Distribution and habitat

Triglops sculpins are widespread in northern seas. In the Pacific Ocean they occur from the Sea of Japan and Sea of Okhotsk east into the Bering Sea, the Aleutian Islands the Gulf of Alaska south to Puget Sound. In the Arctic they are found from the Chuckchi and Beaufort Seas east to the Queen Elizabeth Islands and Hudson Bay and into the Atlantic south as far as Scotland and east to the Barents Sea, Kara Sea and Laptev Sea. They are benthic fishes which are found over varied substrates including rock, gravel, mud or sand at depths varying from the surface down to 930 m (3,050 ft), although they are commonest between 18 and 600 m (59 and 1,969 ft). [5]

Biology

Triglops sculpins are predators of invertebrates such as polychaetes, crustaceans and sometimes smaller fishes. They spawn from late summer into the winter, laying between 100 and over 2,500 demersal eggs. [5]

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References

  1. 1 2 3 4 Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Genera in the family Triglopinae". Catalog of Fishes . California Academy of Sciences . Retrieved 1 March 2023.
  2. ↑ Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Species in the genus Triglops". Catalog of Fishes . California Academy of Sciences . Retrieved 1 March 2023.
  3. ↑ J. S. Nelson; T. C. Grande; M. V. H. Wilson (2016). Fishes of the World (5th ed.). Wiley. pp. 467–495. ISBN   978-1-118-34233-6.
  4. 1 2 Froese, Rainer and Pauly, Daniel, eds. (2022). Species of Triglops in FishBase . August 2022 version.
  5. 1 2 3 Theodore W. Pietsch (1993). "Systematics and distribution of cottid fishes of the genus Triglops Reinhardt (Teleostei:Scorpaeniformes)". Zoological Journal of the Linnean Society. 109: 335–393.
  6. ↑ Ottesen, C. (2004). Taxonomy, morphology and biology of Triglops murrayi and Triglops nybelini (family Cottidae) obtained at Svalbard and Jan Mayen (M.Sc.). Norwegian College of Fishery Science-University of Tromsø.
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