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Macrouroidei
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| Macrouroidei Temporal range:
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|---|---|
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| Vaillant's grenadier (Bathygadus melanobranchus) | |
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| Trachonurus sulcatus | |
Scientific classification 
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| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Gadiformes |
| Suborder: | Macrouroidei |
| Families | |
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See text | |
Macrouroidei is a suborder of deep sea fish, a diverse and ecologically important group,[1][2] which are part of the order of cod-like fish, the Gadiformes. The species in the Macrouroidei are characterised by their large heads[3] which normally have a single barbel on the chin,[4] projecting snouts, and slender bodies that taper to whip-like tails, without an obvious caudal fin[3] but what there is of the caudal fin is often confluent with the posterior dorsal and anal fins.[4] There are normally two dorsal fins, the anterior dorsal fin is quite high, the posterior quite low but is longer and takes up a greater proportion of the fish's back. A few species in the Trachyrincidae have a single dorsal fin.[5] The long anal fin is almost as long as the posterior dorsal fin, and sometimes it is longer. The pelvic fin is inserted in the vicinity of the thorax and normally has 5–17 fin rays but these are absent in Macrouroides. The body is covered in small scales and if they have a photophore, it is usually on the midline of the abdomen just in front of the anus.[4] The bioluminescence of these fish is produced by symbiotic bioluminescent bacteria.[6] The structure of the skull has been used to show their placing in the Gadiformes, but they differ from the typical cods in that they possess one stout spine in the anterior dorsal fin.[3]
The species in this suborder are mainly benthopelagic, they are found at depths of 200–2000 m,[4] they occur on the sea bed[3] and have a wide distribution from the Arctic to the Antarctic.[4] The species in the Macrouridae normally live near the sea bed on the continental slope, however, some species are bathypelagic or mesopelagic, other species occur on the outer continental shelf.[6] Their bodies are loose in texture rather than firm and they are weak swimmers.[3] Some species are of commercial importance to fisheries.[5]
Families
[edit]There are ten families within the Macrouroidei:[7]
- Family Euclichthyidae Cohen, 1984 (Eucla cods)
- Family Muraenolepididae Regan, 1903 (eel cods)
- Family Melanonidae Goode & Bean, 1896 (arrowtails or pelagic cods)
- Family Trachyrincidae Goode & Bean, 1896 (armoured grenadiers)
- Family Moridae Moreau, 1881 (codlings or deepsea cods)
- Family Macruronidae Regan, 1903 (blue grenadiers)
- Family Lyconidae Günther, 1887 (Atlantic hakes)
- Family Bathygadidae Jordan & Evermann, 1898 (rattails)
- Family Steindachneriidae Parr, 1942 (luminous hakes)
- Family Macrouridae Bonaparte, 1831 (grenadiers or rattails)
The earliest known genus is Bobbitichthys Schwarzhans, Milàn & Carnevale, 2021, a stem-macrourid from the middle Paleocene of Denmark.[8] A well-preserved skull of an indeterminate macrourid is known from the Eocene-aged La Meseta Formation of Antarctica.[9] The extinct genus Bolbocara Jordan, 1927 is known from an articulated fossil skeleton from the Late Miocene of California, while Razelaina Carnevale, 2007 is known from the Late Miocene of Algeria.[10][11]
References
[edit]- ^ Fricke, R.; Eschmeyer, W. N.; Van der Laan, R. (2025). "ESCHMEYER'S CATALOG OF FISHES: CLASSIFICATION". California Academy of Sciences. Retrieved 2025-07-02.
- ^ Roa-Varón, Adela; Ortí, Guillermo (2009-09-01). "Phylogenetic relationships among families of Gadiformes (Teleostei, Paracanthopterygii) based on nuclear and mitochondrial data". Molecular Phylogenetics and Evolution. 52 (3): 688–704. doi:10.1016/j.ympev.2009.03.020. ISSN 1055-7903.
- ^ a b c d e "THE GRENADIERS. FAMILY MACROURIDAE". Fishes of the Gulf of Maine. gma.org. Retrieved 1 April 2018.
- ^ a b c d e "Macrouridae Grenadiers Or Rattails". Encyclopedia of Life. Retrieved 1 April 2018.
- ^ a b J.C. Hureau (ed.). "Fishes of the NE Atlantic and the Mediterranean". Marine Species Identification Portal. ETI Bioinformatics. p. Grenadiers (Family Macrouridae). Retrieved 1 April 2018.
- ^ a b Dianne J. Bray. "Family MACROURIDAE". Fishes of Australia. Museums Victoria. Retrieved 1 April 2018.
- ^ Nicolas Bailly, ed. (2015). "Macrouridae Bonaparte, 1831". WoRMS. World Register of Marine Species. Retrieved 1 April 2018.
- ^ "Bulletin Volume 69 – 2021". Dansk Geologisk Forening (in Danish). 2021-01-19. doi:10.37570/bgsd-2021-69-02. Retrieved 2025-02-25.
- ^ Kriwet, Jürgen; Hecht, Thomas (2008-10-01). "A review of early gadiform evolution and diversification: first record of a rattail fish skull (Gadiformes, Macrouridae) from the Eocene of Antarctica, with otoliths preserved in situ". Naturwissenschaften. 95 (10): 899–907. doi:10.1007/s00114-008-0409-5. ISSN 1432-1904.
- ^ David, Lore Rose (1956). "Tertiary Anacanthin Fishes from California and the Pacific Northwest; Their Paleoecological Significance". Journal of Paleontology. 30 (3): 568–607. ISSN 0022-3360.
- ^ Carnevale, Giorgio (2007-02-01). "New gadiform fishes (Teleostei, Gadiformes) from the Miocene of Algeria". Journal of African Earth Sciences. 47 (2): 95–111. doi:10.1016/j.jafrearsci.2006.12.003. ISSN 1464-343X.