| 词条 | Quenstedtoceras |
| 释义 |
| name = Quenstedtoceras | fossil_range = {{Fossilrange|160|154|late Jurassic }} | regnum = Animalia | phylum = Mollusca | classis = Cephalopoda | ordo = Ammonitida | familia = Cardioceratidae | subfamilia = Cardioceratinae | genus = Quenstedtoceras | genus_authority = Hyatt, 1877 }}Quenstedtoceras is a genus of ammonoid cephalopods that lived during the latter part of the Jurassic period in what is now France, Germany, and the United Kingdom.[1] Morphologic descriptionThe shell of Quenstedtoceras is typically evolute and strongly ribbed, with all whorls visible. Widths vary according to the species from rather narrow to somewhat broad, as does ribbing. Ribs commonly start at the umbilical shoulder and extend laterally to about mid flank where they divide and curve forward toward the outer rim, or venter, and meet at a keel. Shells are of moderate size, commonly reaching diameters of about 6 cm (2.4 in).[2][3] Taxonomy and phylogenyQuenstedtoceras, included in the superfamily Stephanocerataceae, now revised to Stephanoceratoidea, is first of the subfamily Cardioceratinae, derived from Cadoceras or related genus is the mid or late Callovian and gave rise at the end of its range in the early Oxfordian to Cardioceras.[4]References1. ^Quenstedtoceras, Fossilworks Gateway {{Taxonbar|from=Q11832889}}{{ammonitina-stub}}2. ^Cardioceratidae-Cardioceratina, Ammonites et autres spirales 3. ^W. J. Arkell et al., 1957. Treatise on Invertebrate Paleontology, Part L. 4. ^Quenstedtoceras 4 : Jurassic ammonites|Ammonites of Europe|Ammonitida genera|Stephanoceratoidea |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。