Английская Википедия:Hesperoceras

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Hesperoceras is an orthocerid cephalopod belonging to the subfamily Michelinoceratinae which comes from the lower Mississippian of New Mexico.

Hesperoceras has a straight, orthoconic, shell with a subrectangular cross section. The sutures are straight and transverse on the narrow sides but form broad rounded lobes on the wide sides, and the siphuncle is small and central.

References

  • Miller, A.K. and Youngquist, W. (1947). The discovery and significance of a cephalopod fauna in the Mississippian Caballero Formation of New Mexico. Journal of Paleontology 21(2):113-117. Шаблон:JSTOR
  • Sweet, Walter C. (1964). Nautiloidea-Orthocerida. Treatise on Invertebrate Paleontology, Part K. Geological Soc of America, and Univ Kansas Press.

Шаблон:Taxonbar