Lispoceras sp. 2

Korn, Dieter & Bockwinkel, Jürgen, 2022, Early Carboniferous nautiloids from the Central Sahara, southern Algeria, European Journal of Taxonomy 831, pp. 67-108 : 105

Lispoceras sp. 2

Fig. 31 , Table 19

Material examined

ALGERIA •Ahnet, west-southwest of Gara Azzel Matti; ‘Dalle des Iridet’ (Ammonellipsites-Merocanites Assemblage; Tournaisian–Viséan boundary interval); Wendt and Kaufmann 1995 Coll.; illustrated in Fig. 31 ; MB.C.30488.

Description

Specimen MB.C.30488 is a fragmented conch with a diameter of almost 70 mm, it consists of a part of the body chamber, the phragmocone of the last whorl and a small piece of the second last whorl (the best-preserved piece is illustrated in Fig. 31 ). The conch is discoidal and subevolute (ww/dm=0.46; uw/ dm =0.41) with a depressed rectangular whorl profile. The flanks are almost parallel and separated from the flattened venter by a rounded but distinct ventrolateral shoulder. Any overlap of the whorls is not visible. The suture line shows a broadly rounded external lobe and a rounded lateral lobe.

Figures

Fig. 31. Lispoceras sp. 2, specimen MB.C.30488 (Wendt and Kaufmann 1995 Coll.) from Azzel Matti; lateral view and whorl profile. Scale bar units =1 mm.