Vistilia salisburgensis ( Schnetzer, 1934 )

Nützel, Alexander & Karapunar, Baran, 2023, On Triassic Murchisonia-like gastropods-surviving the end-Permian extinction to become extinct in the Late Triassic, Acta Palaeontologica Polonica 68 (3), pp. 539-559 : 546-548

publication ID	https://doi.org/ 10.4202/app.01087.2023
persistent identifier	https://treatment.plazi.org/id/03D34B41-9130-F13F-2065-F916E651FFDF
treatment provided by	Felipe
scientific name	Vistilia salisburgensis ( Schnetzer, 1934 )
status

Treatment

Vistilia salisburgensis ( Schnetzer, 1934)

Fig. 5 View Fig .

1934 Stuorella salisburgensis n. sp.; Schnetzer 1934: 35, pl. 1: 12, 13. 2021 Vistilia salisburgensis ( Schnetzer, 1934) ; Karapunar and Nützel 2021: 6, 60.

Material.—A total of 8 specimens from the Anisian (Middle Triassic), Saalfelden, Salzburg, Austria: SNSB-BSPG AS XXXIV 557, holotype, original of Schnetzer 1934: pl. 1: 12, teleoconch fragment of ca. three whorls, parts of shell preserved; paratypes: SNSB-BSPG AS XXXIV 558 (original of Schnetzer 1934: pl. 1: 12), SNSB-BSPG AS XXXIV 559 (five specimens), SNSB-BSPG AS XXXIV 560 .

Fig. 6. Goniasmatid caenogastropod Trypanocochlea cerithioides ( Koken, 1896) , Carnian, Austria. A. SNSB-BSPG, lectotype, 1878 XI B 478 and → original of Koken (1896: text-fig. 11) and Koken (1897: text-fig. 29), Röthelstein, Aussee, in lateral view (A 1), early whorls in lateral view (A 2), aperture with folds in lateral view (A 3). B. SNSB-BSPG 2011 XXXIX 78d, Feuerkogel, in lateral view (B 1), early whorls in lateral view (B 2). C. NHMW 1858/0047/0088, Feuerkogel, in lateral view (C 1), detail of last preserved whorl in lateral view to show growth lines and selenizone on crest (C 2), middle whorl in lateral view (C 3), detail of last preserved whorl in oblique lateral view to show growth lines and selenizone on crest (C 4).

Description.—Fragments of a high-spired shell; whorls low with strong angulation above abapical suture; adapical whorl face steeply sloping, slightly concave, largely smooth with fine prosocline growth lines, faint spiral striation, and distinct spiral cord below adapical suture; selenizone concave at adapical border, distinctly convex near abapical bor- der, forming periphery, smooth or with faint lunulae; whorl face below selenizone narrow, concave, sharply inclining adaxially, with prosocyrt growth lines; base flat, with opisthocyrt growth lines, only partly preserved.

Remarks.—As previously stated by Karapunar and Nützel 2021), Schnetzer’s (1934) original assignment to Stuorella cannot be maintained because this genus does not have whorl angulation with a convex selenizone. Instead, Stuorella has a selenizone on flat whorl face somewhat above basal edge of the whorls. Vistilia salisburgensis has the characteristic teleoconch morphology of Vistilia with low whorls. However, protoconch and early teleoconch of Vistilia salisburgensis are unknown. Vistilia salisburgensis closely resembles Cheilotomona tristriata ( Münster, 1841) from the lower Carnian St. Cassian Formation ( Karapunar and Nützel 2021: fig. 86) in general whorl morphology, surface ornament and in having a pronounced subsutural spiral cord. The presence of a single subsutural cord is a feature also shared by Cheilotomona ( Fig. 4 View Fig ) and Trypanocochlea Fig. 6). Vistilia salisburgensis is the oldest known Triassic species of this genus. Vistilia last appeared in the Carnian Koken 1896).