Beardfish

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Beardfishes
Polymixia nobilis.jpg
Stout Beardfish, (P. nobilis)
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
(unranked): Acanthomorpha
Superorder: Paracanthopterygii
Nelson et al 2016
Families
Synonyms
  • Polymixioidei Bleeker 1859

The beardfishes consist of a single extant genus, Polymixia, of deep-sea marine ray-finned fish named for their pair of long hyoid barbels. Until recently they were classified in their own order Polymixiiformes /pɒliˈmɪksi.ɪfɔːrmz/.[1] But as Nelson says, "few groups have been shifted back and forth as frequently as this one, and they were recently added to Paracanthoptergii".[2] For instance, they have previously been classified as belonging to the Beryciformes. They are of little economic importance.[3]

They are found in tropical and subtropical waters of the Atlantic, Indian and western Pacific Ocean. They are bottom-dwelling fish, found down to about 800 m (2,600 ft) depth. Most are relatively small fish, although one species, Polymixia berndti, is over 40 cm (16 in) in length.[3]

Classification[edit]

Timeline of genera[edit]

QuaternaryNeogenePaleogeneCretaceousHolocenePleistocenePlioceneMioceneOligoceneEocenePaleoceneLate CretaceousEarly CretaceousPolymixiaPycnosterinxDalmatichthysBerycopsiaBerycopsisOmosomaHomonotichthysParaipichthysAipichthysAipichthyoidesQuaternaryNeogenePaleogeneCretaceousHolocenePleistocenePlioceneMioceneOligoceneEocenePaleoceneLate CretaceousEarly Cretaceous

References[edit]

  1. ^ Froese, Rainer, and Daniel Pauly, eds. (2006). "Polymixiiformes" in FishBase. February 2006 version.
  2. ^ Joseph S. Nelson. Fishes of the World. John Wiley & Sons. ISBN 0-471-54713-1.
  3. ^ a b Paxton, John R. (1998). Paxton, J.R.; Eschmeyer, W.N. (eds.). Encyclopedia of Fishes. San Diego: Academic Press. p. 161. ISBN 0-12-547665-5.
  4. ^ Haaramo, Mikko (2007). "Polymixiomorpha – beardfishes and relatives". Mikko's Phylogeny Archive. Retrieved 30 December 2016.
  5. ^ "Part 7- Vertebrates". Collection of genus-group names in a systematic arrangement. Archived from the original on 2016-10-05. Retrieved 30 June 2016.