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Footballfish

Footballfish
Himantolophus groenlandicus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Lophiiformes
Suborder: Ceratioidei
Family: Himantolophidae
Gill, 1861
Genus: Himantolophus
J. C. H. Reinhardt, 1837
Type species
Himantolophus groenlandicus
Reinhardt, 1837
Species

See text

Synonyms
  • Aegoeonichthys Clarke, 1878
  • Corynolophus Gill, 1878
  • Lipactis Regan, 1925
  • Rhynchoceratias Regan, 1925

The footballfish form a family, Himantolophidae, of globose, deep-sea anglerfishes found in tropical and subtropical waters of the Atlantic, Indian, and Pacific Ocean. The family contains 23 species, all of which are classified in a single genus, Himantolophus.

Taxonomy

The footballfish genus, Himantolophus was first proposed as a monospecific genus in 1837 by the Norwegian zoologist Johan Reinhardt when he described Himantolophus groenlandicus.[1] Reinhardt gave the type locality of H. groenlandicus as being near Godthaab in Greenland where it had been washed ashore.[2] In 1861 Theodore Gill placed Himantolophus in the new monotypic family Himantolophidae.[3] The 5th edition of The 5th edition of Fishes of the World classifies this family in the suborder Ceratioidei of the anglerfish order Lophiiformes.[4]

Etymology

The football fish family and genus names are derived from a combination of himantos, which means a "leather strap", "thong" or "leash", with lophus, meaning "crest" or "tuft". Reinhardt did not explain this name but it is thought to refer to the thick, leathery illicium of the type species, H. groenlandicus.[5]

Species and species groups

There are currently 23 recognized species in this genus[6][2] and these are divided into species groups as set out below.[7]

These groups were determined from the morphology of the metamorphosed females, except for brevirostris and rostratus which were determined from males only.[7]

Characteristics

Footballfish are sexually dimorphic with the metamorphosed females and males being very different in appearance. The metamorphosed females are distinguished from other anglerfishes of the suborder Ceratioidei by having a well developed lower jaw which protrudes beyond the snout. They also have a wide vomer which has no teeth, well developed spines on the sphenotic bone, there is a covering of low, rounded papillae on the snout and chin and, at least in larger individuals, there are conical spines in the skin which are scattered over the head and body. The esca of footballfishes vary in size and morphology, to a greater extent than other deep sea anglerfishes. The metamorphosed males have a line of large spines above and behind the upper denticular bone, their eyes are directed to the sides and have moderately sized and they have a large olfactory system with sideways pointing nostrils. They have between 16 and 31 denticular teeth on the snout and between 20 and 50 on the chin, these teeth merge at thire bases to form the upper and lower denticular bones. Their skin has a dense covering of dermal spinules. The larvae are round with a swollen appearance to the skin with pectoral fins that do not extend beyond the dorsal and anal fins, the females have a small club-shaped rudimentary illicium.[7] The males are considerably smaller than the females, for example in H. groenlandicus the maximum published standard length for a male is 4 cm (1.6 in) while that of a females is 60 cm (24 in).[11]

Distribution and habitat

Footballfishes are found in the mesopelagic and bathypelagic zones in the Atlantic, Pacific and Indian Oceans,[12] as well as the Southern Ocean.[8]

Biology

Footballfishes are one of the ceratioid groups in which the males are free living and non-parasitic on the females.[7] The males use their highly developed olfactory organs to detect females, once they find a female they attach themselves to her but do not fuse with her to become parasitic. The eggs and larvae are pelagic.[12] The specialised teeth on the denticular bones are used to temporarily attach the male to the female.[13] There is a record of a female with a scar on her skin that was probably caused by a male that became detached.[14]

At the depths at which these fishes live it is dark and food is sparse and rarely encountered. The female footballfish have bioluminescent bacteria in their escas and this is used to attract prey to within striking distance of the mouth. The prey is whatever they can fit into their mouths, and the backward curving teeth ensure that prey are unable to escape. Recorded prey includes fishes, squid and crustaceans.[15]

Further reading

References

  1. ^ Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Genera in the family Himantolophidae". Catalog of Fishes. California Academy of Sciences. Retrieved 26 June 2024.
  2. ^ a b Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Species in the genus Himantolophus". Catalog of Fishes. California Academy of Sciences. Retrieved 26 June 2024.
  3. ^ Richard van der Laan; William N. Eschmeyer & Ronald Fricke (2014). "Family-group names of recent fishes". Zootaxa. 3882 (2): 1–230. doi:10.11646/zootaxa.3882.1.1. PMID 25543675.
  4. ^ Nelson, J.S.; Grande, T.C.; Wilson, M.V.H. (2016). Fishes of the World (5th ed.). Hoboken, NJ: John Wiley & Sons. pp. 508–518. doi:10.1002/9781119174844. ISBN 978-1-118-34233-6. LCCN 2015037522. OCLC 951899884. OL 25909650M.
  5. ^ Christopher Scharpf (3 June 2024). "Order LOPHIIFORMES (part 2): Families CAULOPHRYNIDAE, NEOCERATIIDAE, MELANOCETIDAE, HIMANTOLOPHIDAE, DICERATIIDAE, ONEIRODIDAE, THAUMATICHTHYIDAE, CENTROPHRYNIDAE, CERATIIDAE, GIGANTACTINIDAE and LINOPHRYNIDAE". The ETYFish Project Fish Name Etymology Database. Christopher Scharpf. Retrieved 25 June 2024.
  6. ^ Froese, Rainer; Pauly, Daniel (eds.). "Species in genus Himantolophus". FishBase. February 2024 version.
  7. ^ a b c d Theodore W. Pietsch Ph.D. (2009). Oceanic Anglerfishes: Extraordinary Diversity in the Deep Sea. University of California Press. p. 63. ISBN 978-0520942554.
  8. ^ a b Pietsch, T. W. and C. P. Kenaley (2011). "A new species of deep-sea ceratioid anglerfish, genus Himantolophus (Lophiiformes: Himantolophidae), from southern waters of all three major oceans of the world". Copeia. 2011 (4): 490–496. doi:10.1643/CI-11-045. JSTOR 4141656.
  9. ^ Melapurra Rajeeshkumar; Theodore W. Pietsch; Naryanane Saravanane (2022). "A new species of deep-sea anglerfish, genus Himantolophus (Lophiiformes: Himantolophidae) from the Andaman Sea, India". Zootaxa. 5178 (6): 589–594. doi:10.11646/ZOOTAXA.5178.6.6. PMID 36095708.
  10. ^ Stewart, A.L.; Pietsch, T.W. (2010). "A new species of deep-sea anglerfish, genus Himantolophus (Lophiiformes: Himantolophidae) from the Western South Pacific, with comments on the validity of H. pseudalbinares" (PDF). Zootaxa. 2671: 53–60. doi:10.11646/zootaxa.2671.1.5.
  11. ^ Froese, Rainer; Pauly, Daniel (eds.). "Himantolophus groenlandicus". FishBase. February 2024 version.
  12. ^ a b Dianne J. Bray. "Footballfishes, HIMANTOLOPHIDAE". Fishes of Australia. Museums Victoria. Retrieved 27 June 2024.
  13. ^ Caruso, J.H. (2002). "Order Lophiiformes: Lophiidae". The Living Marine Resources of the Western Central Atlantic. Rome: Food and Agriculture Organization of the United Nations. pp. 1043–1049.
  14. ^ Theodore W. Pietsch (1976). "Dimorphism, Parasitism and Sex: Reproductive Strategies among Deepsea Ceratioid Anglerfishes". Copeia. 1976 (4): 781–793.
  15. ^ "Our Work Pacific Footballfish". California Academy of Sciences. Retrieved 27 June 2024.
Quelle: https://en.wikipedia.org/wiki/Footballfish