| 词条 | Hemicosmorthoceras |
| 释义 |
| name = Hemicosmorthoceras | fossil_range = Ordovician-Devonian | image = | image_caption = | regnum = Animalia | phylum = Mollusca | classis = Cephalopoda | subclassis = Orthoceratoidea | ordo = Orthocerida | ordo_authority = | familia = | familia_authority = |genus= Hemicosmorthoceras |genus_authority= Foerste (1925) | subdivision_ranks = Species | subdivision = }}Geisonocerina is an extinct genus of actively mobile carnivorous cephalopod, essentially a Nautiloid, that lived in what would be present day Europe during the Silurian to Devonian from 422.9—412.3 mya, existing for approximately {{Mya|422.9-412.3|million years}}.[1] TaxonomyHemicosmorthoceras was named by Foerste (1925). It was assigned to Orthocerida by Teichert et al. (1964); and to Endocerida by Sepkoski (2002).[2]MorphologyThe shell is usually long, and may be straight ("orthoconic") or gently curved. In life, these animals may have been similar to the modern squid, except for the long shell. Fossil distributionFossil distribution is exclusive to Sardinia, Austrian Alps. References1. ^PaleoBiology Database: Hemicosmorthoceras, basic info {{Portal|Paleontology}}{{Taxonbar|from=Q5711493}}2. ^J. J. Sepkoski. 2002. A compendium of fossil marine animal genera. Bulletins of American Paleontology 363:1-560 6 : Cephalopod genera|Silurian cephalopods|Devonian cephalopods|Ordovician first appearances|Devonian extinctions|Prehistoric animals of Europe |
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