Anceps Kolesnikov, 1939

Harzhauser, Mathias, 2021, The Cainozoic to present-day record of Circum-Mediterranean, NE Atlantic and North Sea Cantharidinae and Trochinae (Trochoidea, Gastropoda) - a synopsis, Zootaxa 4902 (1), pp. 1-81 : 17-18

Genus Anceps Kolesnikov, 1939 †

Type species. Trochus anceps Eichwald, 1850 , OD ( Kolesnikov 1939: 701), established as section within Calliostoma Swainson, 1840 . Middle-late Miocene (Bessarabian), Eastern Paratethys ( Russia).

Diagnosis. Anceps comprises thin-shelled, nacreous, depressed conical to moderately high conical shells with carinate, partly flaring and/or tuberculate, basal angulation. Spiral sculpture often reduced; densely spaced growth lines may form prominent axial sculpture. Umbilicus moderately wide, usually strongly narrowed by inner lip or completely sealed.

Remarks. Anceps is available according to Article 10.4 of the ICZN ( A uninominal name proposed for a genusgroup division of a genus, even if proposed for a secondary (or further) subdivision, is deemed to be a subgeneric name even if the division is denoted by a term such as “section” or “division ”).

The species placed in this genus by Sladkovskaya (2017) (as Kolesnikoviella) deviate strongly from Gibbula s.s. in the thin shells, carinate basal angulation and strongly narrowed umbilicus. Therefore, Anceps is treated as distinct genus, endemic to the Sarmatian Paratethys, with origin in the Eastern Paratethys. In the Central Paratethys, it is represented only by Anceps sopronensis (Papp, 1954) .

= Kolesnikoviella Sladkovskaya, 2017 †

Type species: Trochus blainvillei d’Orbigny, 1844 , OD (Sladkovskaya 2017: 1592), as subgenus of Gibbula Risso, 1826 . Middle Miocene (Sarmatian, Volhynian, Bessarabian), Central and Eastern Paratethys.

Remarks. Sladkovskaya (2017) placed Trochus anceps Eichwald, 1850 in her new subgenus Kolesnikoviella and discussed its phylogenetic relations with other members of this genus. This species is type species of Anceps Kolesnikov, 1939 and therefore, Kolesnikoviella Sladkovskaya, 2017 is a subjective junior synonym of Anceps Kolesnikov, 1939 . Despite the similar spelling, Kolesnikoviella is not a junior homonym of Kolesnikovella Bykova in Bykova et al., 1958 (Foraminifera) .

= Sarmates Kolesnikov, 1939 †

Type species. Trochus sarmates Eichwald, 1850 , OD ( Kolesnikov 1939: 701), established as section within Calliostoma Swainson, 1840 . Middle-late Miocene (Volhynian, Bessarabian), Eastern Paratethys.

Remarks. Sarmates is an available name according to Article 10.4. of the ICZN ( A uninominal name proposed for a genus-group division of a genus, even if proposed for a secondary (or further) subdivision, is deemed to be a subgeneric name even if the division is denoted by a term such as “section” or “division ”).

The type species is reminiscent of Anceps in its thin and nacreous shell and the tendency to form a basal carina. As first reviser, I give priority to Anceps Kolesnikov, 1939 .

= Microamberleya Anistratenko & Anistratenko, 2007 † nomen nudum

Remarks. Anistratenko & Anistratenko (2007) placed Trochus blainvillei d’Orbigny, 1844 and Trochus subblainvillei Sinzow, 1897 in the genus Microamberleya Anistratenko, 2000. This genus, however, has never been formally described and is a nomen nudum, because “ Anistratenko, 2000 ” refers to an unpublished PhD-thesis (see also Sladkovskaya 2017). Unfortunately, the description and discussion in Anistratenko & Anistratenko (2007) fail to make the name available.

= Kolesnikowiella Iljina, 1998 † nomen nudum

Remarks. Kolesnikowiella is used as subgenus of Gibbula by Iljina (1998: 24) for 8 species including Trochus blainvillei d’Orbigny, 1844 and Trochus subblainvillei Sinzow, 1897 . Iljina (1998) did not designate a type species and did not provide any description or diagnosis. It was impossible to trace this name in other literature and therefore, it seems to be a nomen nudum.