Orthaspidoceras
{{Short description|Genus of molluscs (fossil)}}
{{italic title}}
{{Taxobox
| fossil_range = {{fossil range|Kimmeridgian}}
| image = Aspidoceratidae - Orthaspidoceras schilleri.JPG
| image_caption = Fossil shell of Orthaspidoceras schilleri, on display at Galerie de paléontologie et d'anatomie comparée in Paris
| regnum = Animalia
| phylum = Mollusca
| classis = Cephalopoda
| ordo = Ammonitida
| familia = Aspidoceratidae
| genus = Orthaspidoceras
| genus_authority = Spath 1925
| subdivision =
- Orthaspidoceras lallerianum (d'Orb.),
- Orthaspidoceras schilleri (Opp.)
- Orthaspidoceras orthocera (d' Orb.).
}}
Orthaspidoceras is an extinct ammonoid cephalopod genus belonging to the family Aspidoceratidae. These nektonic carnivores lived during the Jurassic period, Kimmeridgian age.Sepkoski, Jack [http://strata.geology.wisc.edu/jack/showgenera.php?taxon=231&rank=class Sepkoski's Online Genus Database – Cephalopoda] {{Webarchive|url=https://web.archive.org/web/20160225225905/http://strata.geology.wisc.edu/jack/showgenera.php?taxon=231&rank=class |date=2016-02-25 }}
Description
Shells of Orthaspidoceras are medium or large-sized, with a diameter reaching about {{convert|20|-|25|cm}}. These shells are relatively involute and thick, with a quadrate-rounded or depressed whorls. The ornamentation consists of a row of coarse tubercles and fine streaks.[http://jean-ours.filippi.pagesperso-orange.fr/anglais/kimangl/aspidoceratidaeangl.html Jean-ours.filippi]
Distribution
Jurassic deposites of Italy, Mexico, Switzerland and Yemen.[https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=15289 Paleobiology Database – Orthaspidoceras]. 2014-05-29.
References
{{Reflist}}
- Arkell, et al.,1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L (Ammonoidea). Geol Soc of America and Univ Kansas Press. p. L338-339.
External links
- [http://kimmeridgien17.over-blog.com/article-18298402.html Repartition et evolution du fenre Othaspidoceras]
- [http://crioceratites.free.fr/kimmeridgien_35.htm Crioceratites]
- [http://lithotheque.franceserv.com/cephalopodes/fiche_genre.php?genre=Orthaspidoceras Lithotheque.franceserv]
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