Ptycholepis

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Ptycholepis
Ptycholepis bollensis - Fossils in the Arppeanum - DSC05529.JPG
Ptycholepis bollensis
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Ptycholepiformes
Family: Ptycholepididae
Genus: Ptycholepis
Agassiz, 1833
Type species
Ptycholepis bollensis
Agassiz, 1833
Species
  • P. avus Kner, 1866
  • P. barboiBassani, 1886
  • P. curtusEgerton, 1854
  • P. gracilis(Davis, 1884)
  • P. magnusBürgin, 1992
  • P. marshi Newberry, 1878
  • P. minorEgerton, 1852
  • P. monilifer Woodward, 1895
  • P. priscusBürgin, 1992
  • P. raiblensis Bronn, 1859
  • P. schaefferiBürgin, 1992

Ptycholepis is an extinct genus of prehistoric ray-finned fish [1] having the head and opercular bones ornamented with ridges of ganoin, minute teeth, and thick scales (which are much longer than deep and are grooved longitudinally on the outer side). [2]

Ptycholepis belongs to the family Ptycholepidae (= Boreosomidae/Chungkingichthyidae). Other genera of this family are Acrorhabdus (Spitsbergen, Early Triassic), Ardoreosomus (Nevada, United States; Early Triassic), Boreosomus (global, Early Triassic), Chungkingichthys (China, Early Triassic) and Yuchoulepis (China, Early Triassic). A typical feature of this family is the dorsal fin, which inserts at the level of the pelvic fins in the front part of the body. Other characters include the striated skull bones and scales, and the small teeth.

See also

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References

  1. Sepkoski, Jack (2002). "A compendium of fossil marine animal genera". Bulletins of American Paleontology. 364: 560. Retrieved 2009-02-27.
  2. "Definition of Ptycholepis". Century Dictionary. Wordnik. Retrieved 5 March 2011.