| 词条 | Protetragonites |
| 释义 |
|fossil_range = from Jurassic to Cretaceous, {{fossil range|150.8|94.3}}[1] |image = Lytoceratidae - Protetragonites obliquestrangulatum.JPG |image_caption = Fossil shells of Protetragonites obliquestrangulatum from Alpes-de-Haute-Provence, on display at Galerie de paléontologie et d'anatomie comparée in Paris |regnum = Animalia |phylum = Mollusca |classis = Cephalopoda |subclassis = Ammonoidea |ordo = Ammonitida |subordo = Lytoceratina |familia = Lytoceratidae |subfamilia = Lytoceratinae |genus = Protetragonites |genus_authority = Hyatt, 1900 |synonyms =
}}Protetragonites is an extinct genus of ammonoid cephalopods belonging to the family Lytoceratidae. These fast-moving nektonic carnivores [1] lived from the Jurassic period Tithonian age to the Cretaceous period Aptian age.[2] Species[1]
DescriptionShells of Protetragonites species reach a diameter of about {{convert|50|mm}}. Shells show few constrictions and a circular or triangular section.[4] DistributionFossils of species within this genus have been found in the Cretaceous rocks of Austria, Canada, Czech Republic, Slovakia, Dominican Republic, France, Hungary, Madagascar, Morocco, Poland, Spain, Russia, Ukraine, Western Sahara, as well in the Jurassic of Germany, Hungary and Italy.[1] References1. ^1 2 3 The Paleobiology Database 2. ^Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopoda 3. ^{{Cite journal|author1=Michael W. Maisch |author2=Angélique Salfinger-Maisch |year=2016 |title=First record of the lytoceratid Protetragonites Hyatt, 1900 (Cephalopoda: Ammonoidea) from the Upper Jurassic of southwestern Germany |journal=Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen |volume=280 |issue=2 |pages=183–192 |doi=10.1127/njgpa/2016/0574 }} 4. ^Protetragonites External links
7 : Jurassic ammonites|Cretaceous ammonites|Ammonites of Europe|Tithonian first appearances|Early Cretaceous genus extinctions|Ammonitida genera|Lytoceratidae |
| 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。