Calagrassor mathiasi Kovács, Leél-Őssy & Vicián, 2023

Harzhauser, Mathias & Landau, Bernard M., 2024, The Colubrariidae, Eosiphonidae, Melongenidae, Pisaniidae, Prodotiidae and Tudiclidae (Gastropoda, Buccinoidea) of the Miocene Paratethys Sea, Zootaxa 5427 (1), pp. 1-110 : 23-24

Calagrassor mathiasi Kovács, Leél-Őssy & Vicián, 2023

Figs 9A 1 –A 2

* Calagrassor mathiasi n. sp. —Kovács et al. 2023: 29, figs 73–76.

Type material. Holotype: PAL 2022.53 .1, SL: 21 mm, MD: 8 mm, Lower Ottnangian , Parádfürdő , Ilona Valley ( Hungary), illustrated in Kovács et al. (2023: figs 73–75) . Paratype: stored in the private collection of Zoltán Vicián, SL: 25.4 mm, MD: 10.5 mm, Lower Ottnangian , Parádfürdő , Ilona Valley ( Hungary), illustrated in Kovács et al. (2023: fig. 76) .

Revised description. Medium-sized, fusiform shell of six teleoconch whorls; apical angle ~38º. Protoconch poorly preserved, paucispiral. Early teleoconch whorls slightly gradate, weakly convex with broad axial ribs, overrun by six broad, rounded spiral cords. Sculpture cancellate on first two teleoconch whorls. Axial sculpture fades rapidly on third teleoconch whorl. Suture moderately incised. Last whorl moderately convex, attaining ~65% of total height, with 15 prominent spiral cords; base moderately constricted; fasciole indistinct, broad, with prominent spiral cords. Aperture elongate-ovate, filled by sediment. Siphonal canal moderately short, moderately wide, weakly notched.

Discussion. The Middle Miocene Calagrassor viciani nov. sp. and Gailleagrassor paratethyca nov. sp. differ from C. mathiasi in their more prominent axial sculpture that persists longer. Among the modern congeners Calagrassor poppei ( Fraussen, 2001) , from the Philippines, is most similar but differs in its more convex spire whorls and wider aperture (see Fraussen & Stahlschmidt 2016b: figs 96–98). The extant Calagrassor analogus Fraussen, Chino & Stahlschmidt, 2017 , from Japan, differs in its shorter spire and greater number of spiral cords on the spire whorls (see Fraussen et al. 2017: figs 1–4). The extant Calagrassor pidginoides Fraussen, Chino & Stahlschmidt, 2017 , from Vanuatu, is broader and has flat spiral cords on the last whorl (see Fraussen et al. 2017: figs 10–11).

Paleoenvironment. The assemblage from Parádfürdő ( Hungary), as described by Kovács et al. (2023), points to shallow marine environments, which is in contradiction to the deeper water environments of modern Calagrassor species.

Distribution in Central Paratethys. Ottnangian (Early Miocene): Mátra Mountains: Parádfürdő, llona Valley Section ( Hungary) (Kovács et al. 2023).

Figures

FIGURE 1. Measurements for shell morphology; AA: apical angle, SL: shell length, MD: maximum diameter, LWH: last whorl height, AH: aperture height, AL: aperture length, AW: aperture width.

FIGURE 2. Colubraria subobscura (Hoernes & Auinger, 1884). A1–A3. NHMW 1854/0035/0170, paralectotype, Lăpugiu de Sus (Romania). B1–B2. NHMW 1859/0037/0018a, paralectotype, Lăpugiu de Sus (Romania). C1–C3. NHMW 1865/0001/0183, paralectotype, Lăpugiu de Sus (Romania). D1–D2. NHMW 1859/0037/0018b, paralectotype, Lăpugiu de Sus (Romania). E1–E3. NHMW 1874/0025/0021, lectotype, Lăpugiu de Sus (Romania). F1–F2. NHMW 2023/0338/0001, paralectotype, Lăpugiu de Sus (Romania).

FIGURE 9. A1–A2. Calagrassor mathiasi Kovács, Leél-Őssy & Vicián, 2023, holotype, PAL 2022.53, Parádfürdő, Ilona Valley (Hungary). B. Calagrassor sp., NHMW 2014/0379/0042, Allerding (Austria). C. Calagrassor sp., NHMW 2014/0379/0043, Allerding (Austria).