Vestinautilus sp.

Korn, Dieter & Bockwinkel, Jürgen, 2022, Early Carboniferous nautiloids from the Central Sahara, southern Algeria, European Journal of Taxonomy 831, pp. 67-108 : 94

Vestinautilus sp.

Fig. 22 , Table 12

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. 22 ; MB.C.30475 .

Description

Specimen MB.C.30475 is a chambered fragment with a diameter of 72 mm, heavily affected by desert polishing ( Fig. 22 ). Despite the erosion, the conch shape can still be recognised quite well; the conch is thickly discoidal and subevolute (ww/dm=0.54; uw/dm=0.25) with a depressed trapezoidal whorl profile (ww/wh=1.57). The whorls overlap each other slightly. The venter is concave in the middle and separated from the almost flat area of the flank and umbilical wall by two sharp ridges on the ventrolateral shoulder.

Figures

Fig. 22. Vestinautilus sp., specimen MB.C.30475 (Korn et al. 2002 Coll.) from Oued Temertasset. A. Reconstructed dorsal, lateral and ventral views. B. Suture line, at ww = 39.0 mm, wh =20.5 mm. Scale bar units =1 mm.