Solenochilus sp.

Korn, Dieter & Klug, Christian, 2023, Early Carboniferous coiled nautiloids from the Anti-Atlas (Morocco), European Journal of Taxonomy 885, pp. 156-194 : 188-189

Solenochilus sp.

Fig. 21 ; Table 11

Material examined

MOROCCO • 2 specimens; Anti-Atlas, region south-east of Rissani ; basal Mougoui Ayoun Formation; Karaoui Coll.; PIMUZ 39509 , PIMUZ 39514 .

Description

Specimen PIMUZ 39509 is a phragmocone fragment of a quarter of a whorl ( Fig. 21A ). It has a whorl height of 49 mm and has a weakly depressed whorl profile (ww/wh =1.32). The fragment suggests that the whorls were growing very rapidly; the imprint zone is very small. It is likely that the umbilicus is slightly opened. The suture line is almost straight with a small external lobe and a V-shaped internal lobe ( Fig. 21B ) created by a funnel-like indentation of the septum.

Specimen PIMUZ 39514 is a juvenile specimen with 25 mm conch diameter; it consists of less than one whorl. It is pachyconic with an umbilical window of about 6 mm diameter. The preserved protoconch is 3 mm long and 3.5 mm wide.

Remarks

It is not certain that the two specimens described here belong to the same species. The fragment of the larger specimen shows a slightly open navel in contrast to Solenochilus lucynae sp. nov. The difference to S. pohlei sp. nov. lies in the configuration of the umbilical wall, which forms a longitudinal ridge in S. pohlei .

Figures

Fig. 21. Solenochilus sp., both Karaoui Coll. A. Specimen PIMUZ 39509; whorl profile. B. Specimen PIMUZ 39509; suture line at ww= 61.6 mm, wh =46.3 mm. C. Specimen PIMUZ 39514; dorsal and lateral views. Scale bar units=1 mm.