Lispoceras sp. 1

Korn, Dieter & Bockwinkel, Jürgen, 2022, Early Carboniferous nautiloids from the Central Sahara, southern Algeria, European Journal of Taxonomy 831, pp. 67-108 : 104

Lispoceras sp. 1

Fig. 30 , Table 18

Material examined

ALGERIA • 1 specimen; Mouydir , south of Oued Temertasset (locality MOU-C1); Argiles de Teguentour (Helicocyclus-Ouaoufilalites Assemblage; early late Tournaisian); Korn et al. 2002 Coll.; illustrated in Fig. 30 ; MB.C.30487 .

Description

Specimen MB.C.30487 is a body chamber fragment that belonged to a conch approximately 10 mm diameter ( Fig. 30 ). It has an almost circular whorl profile with a slightly clearer umbilical margin. The last whorl only slightly encompassed the previous one, recognisable by the very small dorsal whorl zone. The shell surface, although marred by desert grinding, is clearly recognisable. The ornament consists of fine growth lines running in a slightly posterior direction across the umbilical wall and flanks, then forming a deep ventral sinus.

Figures

Fig. 30. Lispoceras sp. 1, specimen MB.C.30487 from Oued Temertasset (Korn et al. 2002 Coll.); lateral view and whorl profile. Scale bar units =1 mm.