Shevyrevites Teichert & Kummel, 1973

Korn, Dieter, Hairapetian, Vachik, Ghaderi, Abbas, Leda, Lucyna, Schobben, Martin & Akbari, Amir, 2021, The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran), European Journal of Taxonomy 776, pp. 1-106 : 18

Genus Shevyrevites Teichert & Kummel in Teichert et al., 1973

Type species

Shevyrevites shevyrevi Teichert & Kummel in Teichert et al., 1973, by original designation.

Diagnosis

Representatives of the family Xenodiscidae with a moderately large to large conch; maximum adult diameter between 60 and 80 mm. Subadult stage with a trapezoidal whorl profile, adult stage variable. Subadult stage with small to large conical ventrolateral nodes, adult stage with a weakening sculpture with predominant ribs. Suture line with external lobe that does not reach the depth of the adventive lobe; prongs of the external lobe simple or bifid.

Included species

Shevyrevites shevyrevi Teichert & Kummel in Teichert et al., 1973; Bernhardites nodosus Shevyrev, 1965 ; Shevyrevites corrugatus Korn & Hairapetian sp. nov.

Remarks

The species of Shevyrevites show a coarse ornament consisting of lateral ribs and sometimes also coarse conical nodes in the inner whorls, and are hereby clearly separated from the other genera of the family. Regarding the presence of ventrolateral nodes, there are some similarities to the genera of the family Dzhulfitidae , but these differ in the shape of the suture line: while the external lobe is wide in Shevyrevites , it is always narrow in the Dzhulfitidae .

Teichert & Kummel (in Teichert et al. 1973) caused some nomenclatorial confusion with their opinion on the species of their new genus Shevyrevites . They made clear that “ Celtites radiosus ”, the Triassic type species of Bernhardites Shevyrev, 1965 , differs from the Late Permian forms and that for the latter, a new genus name ( Shevyrevites ) had to be introduced. At the same time, they treated the two species “ Bernhardites radiosus (Frech in Noetling, 1905)” and “ Bernhardites nodosus Shevyrev, 1965 ”, both of which were separated by Shevyrev (1965), as synonyms; they described these under the new genus and species name Shevyrevites shevyrevi . This procedure is not accepTable because it suppresses the species name Shevyrevites nodosus , which in case of synonymy of the two species has priority over Shevyrevites shevyrevi . However, this problem is regarded here minor, as we accept both species as valid.