| 词条 | Hildoceratinae |
| 释义 |
| fossil_range = {{Fossilrange|Pliensbachian|Toarcian|ref=[1]|Upper Pliensbachian to upper Toarcian}} | image = Hildoceras NT.jpg | image_caption = Reconstruction of Hildoceras | taxon = Hildoceratinae | authority = Hyatt, 1867 | synonyms = Mercaticeratinae Guex, 1973 | subdivision_ranks = Genera | subdivision = See text }}Hildoceratinae is an extinct subfamily of cephalopods belonging to the family Hildoceratidae. Ammonites of this subfamily had shells with elliptical or quadrate whorl section with keel or tricarinate, bisulcate venter. Ribs were variable, from falcate to strongly angled and from fine to strong. They can be interrupted by spiral groove in midlateral part of the shell. While some species can be smooth, strongly ribbed ones can have tubercules. Microconchs have short lapplets that is in its shape similar to the shape of growth lines in spiral midlateral groove.[1] Genera[1][2]
DistributionMembers of this subfamily lived from the upper PLiensbachian to upper Toarcian stages of early Jurassic. Distribution has been worldwide.[1][2] References1. ^1 2 3 M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea. {{Taxonbar|from=Q23833057}}{{Ammonitina-stub}}2. ^1 Bardin, J., Rouget, I., & Cecca, F. (2016). The phylogeny of Hildoceratidae (Cephalopoda, Ammonitida) resolved by an integrated coding scheme of the conch. Cladistics. 8 : Hildoceratidae|Early Jurassic ammonites|Ammonites of Asia|Ammonites of Africa|Ammonites of Europe|Ammonites of South America|Ammonites of North America|Prehistoric protostome subfamilies |
| 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。