Biology:Eumecichthys

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Short description: Genus of fishes

Unicorn crestfish
Eumecichthys fiski SI.jpg
Eumecichthys fiski X-ray.jpg
Eumecichthys fiski, conventional and X-ray images
Scientific classification edit
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Lampriformes
Family: Lophotidae
Genus: Eumecichthys
Regan, 1907
Species:
E. fiski
Binomial name
Eumecichthys fiski
(Günther, 1890)
Synonyms

Lophotes fiski Günther, 1890

Unicorn crestfish

Eumecichthys fiski, the unicorn crestfish or unicornfish, is a very rare, little-known species of crestfish in the family Lophotidae, and the only member of the genus Eumecichthys. It likely has a worldwide distribution, having been first discovered offshore of Kalk Bay, South Africa , and subsequently reported from the Sea of Japan, southwest Florida, Clarion Island off Mexico, Hawaii, and India . A report from the Bering Sea may have been in error. It is found in the bathypelagic zone, at a depth of around 1,000 m (3,300 ft).[2][3]

This fish has ribbon-like body measuring up to 150 cm (59 in) in length.[2] Its common name comes from a horn-like supraoccipital process projecting forward of its eyes.[4] The upper jaw is protrusible, and the jaws contain small conical teeth.[5] The dorsal fin runs along the entire length of the body and contains 310-392 soft rays; the first three to five dorsal rays at the tip of the projecting ridge are elongated into a pennant. The pectoral fins contain 13-15 rays; the pelvic fins are absent. The anal fin contains five to 9 rays and in adults is split lengthwise to form two rows of nubbins. The caudal fin contains 12-13 rays, with the bottommost ray enlarged and bony. The coloration is silvery with 24-60 dark subvertical bands. The dorsal and caudal fins are crimson.[6]

Eumenichthys is one of three lampriform genera known to possess ink tubes, allowing them to expel a black fluid from their cloacae as a defense against predators. The ink tube is derived from a primitive gut and runs above and parallel to the intestine.[3] A known predator of the unicorn crestfish is the longnose lancetfish (Alepisaurus ferox); a lancetfish 73 cm (29 in) long has been found that had swallowed a unicorn crestfish 55 cm (22 in) long.[7]

References

  1. Knudsen, S. (2015). Eumecichthys fiski. The IUCN Red List of Threatened Species doi:10.2305/IUCN.UK.2015-4.RLTS.T190107A60791470.en
  2. 2.0 2.1 Froese, Rainer and Pauly, Daniel, eds. (2009). "Eumecichthys fiski" in FishBase. March 2009 version.
  3. 3.0 3.1 Honma, Yoshiharu; Ushiki, Tatsuo; Takeda, Masaei (Feb 1999). "Histology of the ink tube and its associated organs in a unicornfish, Eumecichthys fiskii (Lampridiformes)". Ichthyological Research 46 (1): 19–25. doi:10.1007/BF02674944. 
  4. Richards, W.J. (2006). Early stages of Atlantic fishes: an identification guide for the western central North Atlantic. CRC Press. ISBN 9780849319167. 
  5. Olney, J.E. (1998). "Lophotidae". in Carpenter, K.E.. FAO species identification guide for fishery purposes. The living marine resources of the Western Central Pacific. Food and Agricultural Organization of the United Nations. ISBN 92-5-104302-7. 
  6. Smith, J.L.B.; Smith, M.M.; Heemstra, P. (2003). Smiths' Sea Fishes. Struik. ISBN 1-86872-890-0. 
  7. Fujita, K.; Hattori, J. (1976). "Stomach Content Analysis of Longnose Lancetfish, Alepisaurus ferox in the Eastern Indian Ocean and the Coral Sea". Japanese Journal of Ichthyology 23 (3): 133–142. doi:10.11369/jji1950.23.133. 

Wikidata ☰ Q137988 entry