Granosolarium semilaevis (Sacco, 1892)

Harzhauser, Mathias & Landau, Bernard, 2023, The Architectonicidae and Mathildidae (Gastropoda, Heterobranchia) of the Miocene Paratethys Sea-victims of the Miocene Climatic Transition, Zootaxa 5370 (1), pp. 1-74 : 25-27

publication ID	https://doi.org/ 10.11646/zootaxa.5370.1.1
publication LSID	lsid:zoobank.org:pub:48903495-7C6C-46E4-9B1B-D6A2F2781873
DOI	https://doi.org/10.5281/zenodo.10580791
persistent identifier	https://treatment.plazi.org/id/03BEE17B-FFD9-C07E-FF0E-FAE47D643678
treatment provided by	Plazi
scientific name	Granosolarium semilaevis (Sacco, 1892)
status

Treatment

Granosolarium semilaevis (Sacco, 1892) View in CoL

Figs 4K View FIGURE 4 , 13A–D View FIGURE 13

Solarium millegranum Lam. View in CoL — Ĥrnes 1848: 22 [non Granosolarium millegranum ( Lamarck, 1822) View in CoL ].

Solarium millegranum Lam. View in CoL —Ĥrnes 1856: 465, pl. 46, figs 4a–c [non Granosolarium millegranum ( Lamarck, 1822) View in CoL ].

Solarium millegranum Lam. View in CoL —Neugeboren 1856: 194 [non Granosolarium millegranum ( Lamarck, 1822) View in CoL ].

* [ Solarium (Granosolarium) millegranum] var. semilaevis Sacc. View in CoL —Sacco 1892: 61.

Solarium (Granosolarium) millegranum Lmk. View in CoL —Boettger 1907: 135 [non Granosolarium millegranum ( Lamarck, 1822) View in CoL ].

Solarium millegranum Lmk. View in CoL —Montanaro Gallitelli & Tacoli 1951: 177, pl. 2, fig. 5 [non Granosolarium millegranum ( Lamarck, 1822) View in CoL ].

Architectonica (A [rchitectonica].) millegranum (Lm.) View in CoL —Sieber 1958: 139 [non Granosolarium millegranum ( Lamarck, 1822) View in CoL ].

Architectonica (Architectonica) millegranum Lamarck — Marinescu 1961: 532, pl. 5, figs 20a–f [non Granosolarium millegranum ( Lamarck, 1822) View in CoL ].

Solarium millegranum Lamarck, 1822 View in CoL —Zelinskaya et al. 1968: 133, pl. 34, figs 9–12 [non Granosolarium millegranum ( Lamarck, 1822) View in CoL ].

semilaevis (Solarium View in CoL ) Sacco, 1892— Bieler & Petit 2005: 62.

non Solarium millegranum Lam. View in CoL (?)— Friedberg 1923: 414, pl. 25, fig. 6 [= Nipteraxis exmoniliferus (Sacco, 1892) ].

non Architectonica (Solariaxis) millegranum Lamk. — Korobkov 1955: plate captions, pl. 13, figs 19a–c [= Niperaxis exmoniliferus (Sacco, 1892) ].

Type material. Holotype: NHMW 1846 View Materials /0037/0428a, SL: 6.9 mm, MD: 15.5 mm, M̂llersdorf ( Austria), illustrated in Ĥrnes (1856, pl. 46, figs 4a–c), Figs 13C View FIGURE 13 1 –C View FIGURE 1 2 View FIGURE 2 .

Illustrated material. NHMW 1846/0037/0428b, SL: 4.3 mm, MD: 11.7 mm, M̂llersdorf ( Austria), Figs 13A View FIGURE 13 1 –A View FIGURE 1 2 View FIGURE 2 . NHMW 2013/0078/0113a, SL: 3.1 mm, MD: 10.4 mm, Baden ( Austria), Figs 13B View FIGURE 13 1 –B View FIGURE 1 2 View FIGURE 2 . NHMW 2013/0078/0113b, SL: 3.0 mm, MD: 9.8 mm, Baden ( Austria), Figs 13D View FIGURE 13 1 –D View FIGURE 1 2 View FIGURE 2 . NHMW 1846/0037/0428d, SL: 3.7 mm, MD: 10.3 mm, M̂llersdorf ( Austria), Fig. 4K View FIGURE 4 .

Additional material. 1 spec. NHMW 1846 View Materials /0037/0428c, M̂llersdorf ( Austria) .

Revised description. Shell small, flattened, discoidal, periphery carinate, with flattened cyrtoconoid spire. Protoconch heterostrophic, large, of 1.2 visible whorls (diameter 1.2 mm). Teleoconch of about 4.5 whorls. SSC, UPC and LPC narrow, beaded. Two or three beaded spiral cords become successively intercalated between peripheral cords; three to four beaded spiral cords appear on mid-field separated by delicately beaded spiral threads. LPC forming sharp crenulated carina, also serving as upper point of whorl attachment. Base weakly concave below carina; laterally three finely beaded spiral cords (including LPC) and up to five delicate beaded spiral threads intercalated; medially three more coarsely beaded spiral cords; UC fine, narrow, sunken into and overhanging umbilicus. Umbilicus very wide (~40–41% of total diameter). Umbilical wall bearing prosocline growth lines. Aperture small, rounded, sharply pointed at peripheral keel; CG and PG absent.

Discussion. This species was considered conspecific with the Late Miocene to Pliocene (Proto-)Mediterranean Granosolarium millegranum ( Lamarck, 1822) by most authors. Only Sacco (1892) recognized that the specimen from the Middle Miocene of the Vienna Basin illustrated by Hörnes (1856) was not conspecific with G. millegranum and introduced the varietal name semilaevis for it. Granosolarium millegranum differs from G. semilaevis in its much larger size (max. diameter 17.5 mm versus 10.4 mm), more sharply carinate periphery, the narrower umbilicus, and the more reduced sculpture of beads on the spiral cords of the dorsal and ventral side (e.g., Cavallo & Repetto 1992: 152, fig. 419; Bogi et al. 2002: 35, figs 21–22; Chirli 2013: 12, pl. 4, figs 4–9).

Paleoecology. All Austrian specimens drive from clays of the Baden Formation, which formed in middle to outer neritic environments with up to 210 m water depth ( Kranner et al. 2021).

Distribution. Only known from the Langhian equivalent of the Badenian of the Central Paratethys Sea.

Central Paratethys Sea. Middle Miocene (Badenian): Alpine-Carpathian Foredeep: Žabčice ( Czech Republic) (Montanaro Gallitelli & Tacoli 1951); Vienna Basin: Baden, M̂llersdorf ( Austria) (Ĥrnes 1856); Făget Basin: Coşteiu de Sus, Lăpugiu de Sus ( Romania) (Boettger 1907), Bahna-Orşova Basin: Racovăţ, Iloviţa ( Romania) ( Marinescu 1961).