| 词条 | Hesperoceras |
| 释义 |
| name = Hesperoceras | fossil_range = L Mississippian | image = | regnum = Animalia | phylum = Mollusca | classis = Cephalopoda | subclassis = Nautiloidea | ordo = Orthocerida | superfamilia = Orthocerataceae | familia = Orthoceratidae | subfamilia = Michelinoceratinae | genus = Hesperoceras | genus_authority = Miller & Youngquist, 1974 }} 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
1 : Nautiloids |
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