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Tonguefish

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Tonguefishes
Northern tonguefish, Symphurus pusillus
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Actinopterygii
Order:
Pleuronectiformes
Suborder:
Soleoidei
Family:
Cynoglossidae
Subfamilies & Genera[1]

Subfamily Cynoglossinae

Cynoglossus
Paraplagusia

Subfamily Symphurinae

Symphurus
A preserved tongue sole at a lab

Tonguefishes are flatfishes in the family Cynoglossidae. They are distinguished by the presence of a long hook on the snout overhanging the mouth, and the absence of pectoral fins. Their eyes are both on the left side of their bodies, which also lack a pelvic fin.[2] This family has three genera with a total of more than 140 species. The largest reaches a length of 66 cm (26 in), though most species only reach half that size or less.[3][4][5] They are found in tropical and subtropical oceans, mainly in shallow waters and estuaries, though a few species found in deep sea floors,[6] and a few in rivers.

Symphurus thermophilus lives congregating around "ponds" of sulphur at hydrothermal vents on the seafloor. No other flatfish is known from hydrothermal vents.[7] Scientists are unsure of the mechanism that allows the fish to survive and even thrive in such a hostile environment.[8]

See also

References

  1. ^ Froese, Rainer; Pauly, Daniel (eds.). "Family Cynoglossidae". FishBase. October 2012 version.
  2. ^ Chapleau, Francois; Amaoka, Kunio (1998). Paxton, J. R.; Eschmeyer, W. N. (eds.). Encyclopedia of Fishes. San Diego: Academic Press. p. 225. ISBN 0-12-547665-5.
  3. ^ Froese, Rainer; Pauly, Daniel (eds.). "Species in genus Cynoglossus". FishBase. May 2014 version.
  4. ^ Froese, Rainer; Pauly, Daniel (eds.). "Species in genus Paraplagusia". FishBase. May 2014 version.
  5. ^ Froese, Rainer; Pauly, Daniel (eds.). "Species in genus Symphurus". FishBase. May 2014 version.
  6. ^ "Taxonomic status of three nominal species of Indo-Pacific symphurine tonguefishes (Symphurus: Cynoglossidae: Pleuronectiformes)". ResearchGate. doi:10.1007/BF02678697. Retrieved 2015-11-01.
  7. ^ Munroe, Thomas A.; Hashimoto, Jun (1 August 2008). "A new Western Pacific Tonguefish (Pleuronectiformes: Cynoglossidae): The first Pleuronectiform discovered at active Hydrothermal Vents" (PDF). Zootaxa. 1839: 43–59.
  8. ^ Amos, Jonathan (14 December 2006). "Fish dance on sulphur cauldrons". BBC News. Retrieved 25 May 2010.
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