Paucitornoceras, Korn & Bockwinkel, 2022

Korn, Dieter & Bockwinkel, Jürgen, 2022, The tornoceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea), European Journal of Taxonomy 806, pp. 32-51 : 46-47

Genus Paucitornoceras gen. nov.

urn:lsid:zoobank.org:act:63C6391D-3A33-428C-B981-55D56AE323F9

Type species

Goniatites paucistriatus d`Archiac & de Verneuil, 1842.

Diagnosis

Genus of the subfamily Aulatornoceratinae with compressed conch, umbilicus moderately wide in the preadult and adult stage. With deep ventrolateral grooves. Ornament with biconvex growth lines with high ventrolateral projection, sharp ribs in the preadult stage, becoming finer in the adult stage.

Etymology

After the Latin adjective ‘ paucis ’ = ‘few’, because of the low number of ribs, and the reference to the genus Tornoceras and the type species P. paucistriatum .

Included species

Goniatites paucistriatus d’Archiac & de Verneuil, 1842 , Rhenish Mountains; Tornoceras rhysum Clarke, 1898 , New York.

Remarks

Miller (1938: 142) and House & Kirchgasser (2008: 175) already discussed the differentiation of species groups within the genus Aulatornoceras . The new genus differs from Aulatornoceras in the wider umbilicus (uw/dm is between 0.20 and 0.30, as opposed to about 0.15) and the considerably coarser ribs of Aulatornoceras .