Hesperoceras is an orthocerid cephalopod belonging to the subfamily Michelinoceratinae which comes from the lower Mississippian of New Mexico.
Hesperoceras Temporal range: L Mississippian
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Subfamily: | Michelinoceratinae
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Genus: | Hesperoceras Miller & Youngquist, 1947
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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
edit- 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. JSTOR 1299455
- Sweet, Walter C. (1964). Nautiloidea-Orthocerida. Treatise on Invertebrate Paleontology, Part K. Geological Soc of America, and Univ Kansas Press.