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Stylephorus chordatus

Stylephorus chordatus

Superregnum : Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Superclassis/Classis: Actinopterygii
Classis/Subclassis: Actinopteri
Subclassis/Infraclassis: Neopterygii
Infraclassis: Teleostei
Megacohors: Osteoglossocephalai
Supercohors: Clupeocephala
Cohors: Euteleosteomorpha
Subcohors: Neoteleostei
Infracohors: Eurypterygia
Sectio: Ctenosquamata
Subsectio: Acanthomorphata
Divisio/Superordo: Paracanthopterygii
Series: Zeiogadaria
Subseries: Gadariae
Ordo: Stylephoriformes
Familia: Stylephoridae
Genus: Stylephorus
Species: Stylephorus chordatus
Name

Stylephorus chordatus Shaw, 1791
References

Shaw, G. 1791. Description of the Stylephorus chordatus, a new fish. The Transactions of the Linnean Society of London v. 1: 90–92, Pl. 6.
Nelson, Joseph S. (2006) Fishes of the World. John Wiley & Sons, ISBN: 0–471-25031-7.
Stylephorus chordatus – Taxon details on Integrated Taxonomic Information System (ITIS).

Vernacular names
English: Tube-eye

Stylephorus chordatus, the tube-eye or thread-tail, is a deep-sea fish, the only fish in the genus Stylephorus and family Stylephoridae.[1][2]

It is found in deep subtropical and tropical waters around the world, living at depths during the day and making nightly vertical migrations to feed on plankton. It is an extremely elongated fish; although its body grows only to 28 cm (11 in) long, its pair of tail fin rays triple its length to about 90 cm (35 in). Its eyes are tubular in shape, resembling a pair of binoculars.[3]

It has a tubular mouth through which it sucks seawater by enlarging its oral cavity to about 40 times its original size. It then expels the water through the gills, leaving behind the copepods on which it feeds.[3]

The phylogenetic position of the tube-eye has been controversial. It has been historically placed amongst Lampriformes, but a study involving mitochondrial and nuclear DNA[4] sequences analysis suggested Stylephorus is instead a close parent of the Gadiformes order (cods and hakes).
References

Froese, Rainer, and Daniel Pauly, eds. (2006). "Stylephoridae" in FishBase. February 2006 version.
Froese, Rainer; Pauly, Daniel (eds.) (2012). "Stylephorus chordatus" in FishBase. April 2012 version.
Olney, John E. (1998). Paxton, J.R.; Eschmeyer, W.N. (eds.). Encyclopedia of Fishes. San Diego: Academic Press. p. 158. ISBN 0-12-547665-5.
Miya, M.; Holcroft, N.I.; Satoh, T.P.; Yamaguchi, M.; Nishida, M.; Wiley, E.O.; Masaki Miya; Nancy I. Holcroft; Takashi P. Satoh; Motoomi Yamaguchi; Mutsumi Nishida; E.O. Wiley (2007). "Mitochondrial genome and a nuclear gene indicate a novel phylogenetic position of deep-sea tube-eye fish (Stylephoridae)". Ichthyological Research. 54 (4): 323–332. doi:10.1007/s10228-007-0408-0. S2CID 38375399.

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