Radstockiceras

Radstockiceras Temporal range: Sinemurian–Pliensbachian [1] [2] PreꞒ Ꞓ O S D C P T J K Pg N
Radstockiceras buvigneri [3]
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	† Ammonoidea
Order:	† Ammonitida
Family:	† Oxynoticeratidae
Genus:	† Radstockiceras Buckman, 1918
Type species
Radstockiceras complicatum Buckman, 1918
Species
Radstockiceras buvignerid'Orbigny, 1844 Radstockiceras complanosumSimpson, 1855 Radstockiceras complicatumBuckman, 1918 Radstockiceras coynartid'Orbigny, 1844 Radstockiceras fastigatumVenturi et al, 2005 Radstockiceras gemmellaroiPompeckj, 1906 Radstockiceras hechingenseSchlatter, 1980 Radstockiceras involutumPompeckj, 1906 Radstockiceras lynxd'Orbigny, 1844 Radstockiceras oscensisRivas, 1977 Radstockiceras pseudosaemanniRivas, 1977 Radstockiceras wiltshireiWright, 1881
Synonyms
FastigicerasBuckman, 1919 RetenticerasBuckman, 1920 MetoxynoticerasSpath, 1922 PhylloxynoticerasBuckman, 1924 HomoxynoticerasBuckman, 1925 KleistoxynoticerasBuckman, 1925 CarixicerasSpath, 1925 RadstokicerasRoman, 1938 OxynoticeroidesDommergues et al, 1986

Radstockiceras is an extinct genus of lower Jurassic ammonite that lived from Oxynotum zone of upper Sinemurian to Raricostatum zone of lower Pliensbachian. Shells of these animals were oxycone and involute with umbilicus that took maximum of 12% of diameter in the case of outer whorls. On inner whorls, venter has been sharp, but then it became rounded. Faint ribs had falcoid shape, but sometimes, ribs could absent. Shells could have been large in their size. Suture has been very complex, similar to Oxynoticeras , but culmination at umbilical margin has been missing. ^[1] Genus has been named after town of Radstock, in Somerset. ^[4]

Distribution

Fossils belonging to this genus are found in Europe, South America, North Africa and Turkey. ^{[1] [5]}

References

1. M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
2. Sepkoski, Jack (2002). "Sepkoski's Online Genus Database" . Retrieved 2014-05-28.
3. Les ammonites du Pliensbachien et du Toarcien basal dans la carrière de la Roche Blain (Fresney le Puceux, Calvados, Basse Normandie, France). Taxonomie, implications stratigraphiques et paléobiogéographiques
4. Schlegelmilch, R. (1992). Die Ammoniten des süddeutschen Lias: ein Bestimmungsbuch für Fossiliensammler und Geologen. Springer Spektrum.
5. Radstockiceras on the Paleobiology Database.