| 词条 | Forresteria |
| 释义 |
|fossil_range = {{Fossilrange|93.5|85.8|Turonian - Coniacian }} |image = Collignoniceratidae - Forresteria species.JPG |image_caption = Fossil of Forresteria species. Coniacian of Madagascar |taxon = Forresteria |authority = Reeside, 1932 |subdivision_ranks = Species |subdivision = See text }} Forresteria is an extinct genus of cephalopod belonging to the subclass Ammonoidea. They flourished during the late Turonian and early Coniacian of the Late Cretaceous,[1] and were global in extent. Forresteria alluaudi and Forresteria hobsoni are considered marker fossils for the lower Coniacian in the American West. DescriptionAlthough the whorl section and ornament of Forresteria are variable, it is easily distinguished from Barroisiceras by the presence of mid-lateral tubercles on the inner whorls, which later disappear or fuse with either umbilical or ventrolateral tubercles. Four subgenera are recognized [2]
Speciesspecies in Forresteria include:
References{{commons category|Forresteria|Forresteria}}1. ^1 Cobban, William A. et al (2006) "A USGS Zonal Table for the Upper Cretaceous Middle Cenomanian-Maastrichtian of the Western Interior of the United States Based on Ammonites, Inoceramids, and Radiometric Ages" USGS (Open-File Report 2006–1250) {{Taxonbar|from=Q5470556}}{{Ammonitina-stub}}2. ^W.J Arkell et al., 1957 Mesozoic Ammonidea. Treatise on Invertebrate Paleontology, Part L Ammonoidea. 6 : Ammonitida genera|Collignoniceratidae|Cretaceous ammonites|Ammonites of North America|Turonian genus first appearances|Coniacian genus extinctions |
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