Darkaoceras Bockwinkel, Becker & Ebbighausen, 2009

Korn, Dieter & Bockwinkel, Jürgen, 2022, The early gephuroceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea), European Journal of Taxonomy 823, pp. 10-47 : 29

Genus Darkaoceras Bockwinkel, Becker & Ebbighausen, 2009

Type species

Timanites meridionalis Petter, 1959 (original designation).

Diagnosis

Genus of the family Taouzitidae with extremely discoidal, subinvolute to involute conch; venter subacute or acute in the adult stage. With single ventrolateral grooves. Suture line with wide external lobe, high median saddle, V-shaped E 2 lobe, V-shaped lateral lobe and shallow, rounded umbilical lobes. Suture line formula (E 2 E 1 E 2) L U 2 U 4: U 3 U 1 I.

Included species

Timanites meridionalis Petter, 1959 , Ougarta; Timanites complanatum Petter, 1959 , Saoura Valley; Koenenites galeatus Matern, 1931 , Rhenish Mountains; Darkaoceras velox Bockwinkel, Becker & Ebbighausen, 2013 , Anti-Atlas.

Remarks

Darkaoceras (with subacute venter and four umbilical lobes) is morphologically intermediate between Mzerrebites (with narrowly rounded venter and three umbilical lobes) and Taouzites (with sharp venter and up to eight umbilical lobes).