Early Carboniferous nautiloids from the Central Sahara, southern Algeria Author Korn, Dieter 286CA4F3-7EBC-4AEF-A66A-B2508D001367 Museum für Naturkunde, Leibniz Institut for Research on Evolution and Biodiversity, Invalidenstrasse 43, 10115 Berlin, Germany. dieter.korn@mfn.berlin Author Bockwinkel, Jürgen F7FE7EEA-B678-4FEE-879C-8C429F66BF3A Dechant-Fein-Strasse 22, 51375 Leverkusen, Germany. jbockwinkel@t-online.de text European Journal of Taxonomy 2022 2022-07-20 831 67 108 http://dx.doi.org/10.5852/ejt.2022.831.1871 journal article 105313 10.5852/ejt.2022.831.1871 e697ba5c-5a96-4a28-985c-748890333d6c 2118-9773 6885198 EAA2EAE2-DA8B-4516-B332-CB8423B8EEAA Stroborineceras insalahensis gen. et sp. nov. urn:lsid:zoobank.org:act: F19AF373-B30D-4DCA-ADDE-C0C2678A753F Figs 6–7 , Table 2 Diagnosis Species of Stroborineceras gen. nov. with depressed, rounded-triangular whorl profile (ww/wh ~1.50), venter strongly flattened, ventrolateral shoulder subangular with sharp longitudinal ridges. Whorls not embracing. Ornament with fine spiral ridges in the submarginal ventral position; five or six spiral ridges are located on the flank. Etymology Named after the town of In Salah in the central Sahara Desert. Type material Holotype ALGERIA • Mouydir , south of Oued Temertasset (locality MOU-E07) ; Argiles de Teguentour ( Upper Pericyclus-Progoniatites Assemblage; early late Tournaisian ); Korn et al . 2002 Coll.; illustrated in Fig. 6B ; MB.C.30445.1 . Paratypes ALGERIA • 2 specimens ; Mouydir , south of Oued Temertasset (locality MOU-E07) ; Argiles de Teguentour ( Upper Pericyclus-Progoniatites Assemblage; early late Tournaisian ); Korn et al . 2002 Coll.; illustrated in Fig. 6A, C ; MB.C.30445.2 – MB.C.30445.3 • 1 specimen ; Mouydir , south of Oued Temertasset (locality MOU-D2) ; Argiles de Teguentour ( Upper Pericyclus-Progoniatites Assemblage; early late Tournaisian ); Korn et al . 2002 Coll.; illustrated in Fig. 6D ; MB.C.30446.1 • 18 specimens ; Mouydir , south of Oued Temertasset (localities MOU-D2, MOU-A, MOU-C5, MOU-D1, MOU-E06, MOU-V, MOU-Z) ; Argiles de Teguentour ( Upper Pericyclus-Progoniatites Assemblage; early late Tournaisian ); Korn et al . 2002 Coll.; MB.C.30446.2 , MB.C.30447.1–MB.C.30447.4 , MB.C.30448.1– MB.C.30448.2 , MB.C.30449.1–MB.C.30449.6 , MB.C.30450 , MB.C.30451 , MB.C.30452.1– MB.C.30452.3 • 1 specimen ; Sebkha de Timimoun 11 km south-west of Timimoun (locality TIM-B0) ; Grès de Kahla supérieur ( Upper Pericyclus-Progoniatites Assemblage; early late Tournaisian ); Korn et al . 2002 Coll.; MB.C.30453 . Fig. 6. Stroborineceras insalahensis gen. et sp. nov. from Oued Temertasset (all Korn et al . 2002 Coll.). A . Paratype MB.C.30445.2. B . Holotype MB.C.30445.1. C . Paratype MB.C.30445.3. D . Paratype MB .C.30446.1. Scale bar units = 1 mm . Table 2. Conch dimensions (in mm) and ratios of Stroborineceras insalahensis gen. et sp. nov.

Specimen	dm	ww	wh	uw	ah	ww/dm ww/wh uw/dm			WER	IZW
MB.C.30445.3	–	15.9	10.4	–	–	–	1.53	–	–	–
MB.C.30445.1	–	15.6	10.3	–	–	–	1.51	–	–	–
MB.C.30446.1	–	14.5	9.3	–	–	–	1.56	–	–	–
MB.C.30445.2	–	13.6	9.2	–	–	–	1.49	–	–	–

Description Holotype MB.C.30445.1 is a whorl fragment of about 90 degrees angular length, consisting of the last chambers of the phragmocone and part of the body chamber ( Fig. 6B ). The maximum whorl height is 11 mm . The whorl profile is rounded-triangular and depressed (ww/wh = 1.51) with a flattened venter and an almost semi-circular area encompassing the flanks and dorsum ( Fig. 7A ); the ventrolateral shoulder is subangular. The specimen bears at least eight longitudinal lines, two of which are on the edge of the venter and six on the flank. The suture line shows a broad, almost semi-circular external lobe, a tightly rounded ventrolateral saddle and a shallow and very broad lateral lobe. On the dorsum the suture line shows an almost straight course ( Fig. 7E ). The paratypes illustrate that the variation is quite low; all specimens show very similar whorl profiles, ornament and suture line. Compared to the holotype , the paratype MB.C.30445.2 ( Fig. 6A ) has more strongly developed spiral lines on the flanks and the paratypes MB.C.30445.3 ( Fig. 6C ) and MB.C.30446.1 ( Fig. 6D ) show slightly more distinct submarginal ridges on the venter. Remarks Stroborineceras insalahensis gen. et sp. nov. differs from S. felis gen. et sp. nov. by the more depressed whorl profile (ww/wh = 1.55 in S. insalahensis gen. et sp. nov. but only 1.25 in S. felis gen. et sp. nov. ), by the flattened or weakly convex venter (concave in S. felis gen. et sp. nov. ) and by the considerably stronger spiral lines (weakly developed and absent on the venter in S. felis gen. et sp. nov. ).