Radstockiceras

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.^[3]

Radstockiceras Temporal range: Sinemurian–Pliensbachian[1][2] PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Oxynoticeratidae
Genus:	†Radstockiceras Buckman, 1918
Type species
Radstockiceras complicatum Buckman, 1918
Species
Radstockiceras buvigneri d'Orbigny, 1844 Radstockiceras complanosum Simpson, 1855 Radstockiceras complicatum Buckman, 1918 Radstockiceras coynarti d'Orbigny, 1844 Radstockiceras fastigatum Venturi et al, 2005 Radstockiceras gemmellaroi Pompeckj, 1906 Radstockiceras hechingense Schlatter, 1980 Radstockiceras involutum Pompeckj, 1906 Radstockiceras lynx d'Orbigny, 1844 Radstockiceras oscensis Rivas, 1977 Radstockiceras pseudosaemanni Rivas, 1977 Radstockiceras wiltshirei Wright, 1881
Synonyms
Fastigiceras Buckman, 1919 Retenticeras Buckman, 1920 Metoxynoticeras Spath, 1922 Phylloxynoticeras Buckman, 1924 Homoxynoticeras Buckman, 1925 Kleistoxynoticeras Buckman, 1925 Carixiceras Spath, 1925 Radstokiceras Roman, 1938 Oxynoticeroides Dommergues et al, 1986