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 Genus Vestinautilus Ryckholt, 1852 Type species Nautilus Koninckii d’Orbigny, 1850 ; subsequent designation by Hyatt (1883 –1884). Diagnosis Genus of the family Trigonoceratidae with evolute conch; whorls slightly impressed; whorl profile rounded-triangular or trapezoidal with flattened or weakly concave venter and pronounced ventrolateral shoulder. Ornament with fine lines and very coarse spiral ridges around the ventrolateral shoulder, sometimes also on the venter. Suture line slightly sinuous. Siphuncle small with subcentral position (after Kummel 1964 ; emended by Korn et al. 2022 ). Included species Nautilus ( Trematodiscus ) altidorsalis Winchell, 1862 , Michigan; Nautilus biangulatus Sowerby, 1825 , Southwest England ; Nautilus cariniferus Sowerby, 1825 , Ireland ; Vestinautilus concinnus Korn, Miao & Bockwinkel, 2022 , Algeria ; Triboloceras formosum Foord, 1900 , Ireland ; Nautilus Koninckii d’Orbigny, 1850 , Belgium ; Nautilus multicarinatus Sowerby, 1825 , Ireland ; Vestinautilus padus Korn, Miao & Bockwinkel, 2022 , Algeria ; Coelonautilus paucicarinatus Foord, 1891 , Ireland ; Nautilus pinguis de Koninck, 1844 , Belgium ; Vestinautilus semiglaber Foord, 1900 , Ireland ; Vestinautilus semiplicatus Foord, 1900 , Ireland ; Vestinautilus angulatus sp. nov. , Algeria ; Vestinautilus papilio sp. nov. , Algeria ; Vestinautilus inflexus sp. nov. , Algeria ; Vestinautilus bicristatus sp. nov. , Algeria . Remarks In the description of the nautiloids from the Dalle à Merocanites , Korn et al. (2022) discussed the relationships between the genera Vestinautilus and Subvestinautilus ; they considered the latter as a junior synonym. Vestinautilus differs from the other genera of the family Trigonoceratidae by the rather weakly ornamented shell in combination with a rounded-triangular or trapezoidal whorl profile. However, it should be noted that some of these genera, such as Rineceras , Vestinautilus and Stroboceras , show quite similar conch and ornamentat morphology at the beginning of their occurrence in the Tournaisian.