Perrona floriana
Creators: name: Harzhauser, Mathias
name: Landau, Bernard
name: Janssen, Ronald
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Neogastropoda
Clavatulidae
Perrona
Perrona floriana

description: Perrona floriana (Hilber, 1879)   
 Figs 31E 1 –E 3, 4P, 5, 7   
 * Pleurotoma (Clavatula) Floriana Hilb. — Hilber 1879: 18, pl. 3, figs 4a–d.   
 Pleurotoma (Clavatula) Floriana Hilb. — Hoernes & Auinger 1891: 357, pl. 48, figs 16a–b.   
 ? Clavatula floriana (Hilber) 1879 — Bohn-Havas 1973: 1063.   
 non Perrona floriana (Hilb.) — Sieber 1947: 111 [= Perrona loetschi nov. sp.].   
 non Clavatula (Perrona) floriana Hilber — Švagrovský 1958: 20, pl. 6, fig. 3 [= Perrona vindobonensis (Quenstedt, 1884)]. non Clavatula (Perrona) floriana (Hilber, 1879) — Mikuž 1998: 77, pl. 5, figs 3, 6, 7 [= Perrona ernae (Šuklje, 1929)].   
 non Perrona floriana (Hilber, 1879) — Mikuž 2009: 33, pl.11, fig. 147 [= Perrona ernae (Šuklje, 1929)].   
 Type material. Holotype: NHMW 1858/0020/0012, Guglitz at St. Florian (Austria), SL: 24.5 mm, MD: 10.4 mm, illustrated in Hilber (1879, pl. 3, figs 4a–d) and in Hoernes & Auinger (1891, pl. 48, figs 16a–b); figs 31E 1 –E 3, 4P. Revised description. Shell medium-sized, moderately solid, broad fusiform, with weakly gradate spire; apical angle 34°. Protoconch not preserved. Teleoconch of at least nine whorls. Early teleoconch whorls with two adsutural smooth, narrow spiral cords separated by deep concavity with strongly opisthocline axial riblets. On fifth teleoconch whorl profile subcylindrical, subsutural cord weakens. Subsutural collar broad, flat, not swollen. Whorl profile flat-sided with periphery at abapical suture. Suprasutural cord disappears, surface below collar area covered in fine flattened cords separated by narrow, shallow grooves. Suture narrowly incised, superficial. Last whorl ~65% of total height, broad. Collar and subsutural ramp not sharply delimited. Low-set shoulder inflated and broadly rounded, moderately constricted below, base not delimited. Siphonal fasciole weakly developed. Sculpture of fine spiral cords very weak over subsutural collar, slightly stronger over ramp, subobsolete at mid-whorl, strengthening again with cords of alternate strength over base and fasciole. Aperture moderately wide, pyriform. Outer lip thin, smooth within. Anal sinus wide, moderately deep, asymmetrically U-shaped, with apex just below ramp. Siphonal canal moderately long, wide, slightly deflected, shallowly notched at tip. Columella moderately excavated in upper third, straight below, twisted at fasciole, smooth. Columellar and parietal callus slightly thickened, sharply delimited, forming moderately broad callus rim.   
 Discussion. This species is documented so far by a single specimen, which makes it difficult to evaluate the status of Perrona floriana (Hilber, 1879). However, it is so unlike any of its congeners that it probably represents a good species. It is unique amongst the Paratethyan Perrona species in having the subsutural collar not swollen and completely devoid of tubercles on the last two whorls, on the last whorl the subsutural ramp flat and hardly delimited and the shoulder broadly rounded, and again hardly delimited, and the base is not delimited at all. Perrona floriana lacks a shoulder like P. ilonae nov. nom., has a more conical spire whorls and a much broader last whorl. Perrona floriana differs from Perrona vindobonensis (Quenstedt, 1884) by the rounded shoulder and the absence of any subsutural swelling. The same feature allows a separation from P. lydiae (Hoernes & Auinger, 1891) and P. descendens (Hilber, 1879). The species was listed by Bohn-Havas (1973: 1063) but this identification will need confirmation. All records from the literature, except for the original descriptions by Hilber (1879) and Hoernes & Auinger (1891) represent other species.   
 Paleoenvironment. The assemblage from St. Florian suggests inner neritic, lagoonal environments (own data).   
 Distribution in Central Paratethys. Badenian (middle Miocene): Styrian Basin: St. Florian (Austria) (Hilber 1879).
description: Published as part of Harzhauser, Mathias, Landau, Bernard & Janssen, Ronald, 2022, The Clavatulidae (Gastropoda, Conoidea) of the Miocene Paratethys Sea with considerations on fossil and extant Clavatulidae genera, pp. 1-172 in Zootaxa 5123 (1) on page 106, DOI: 10.11646/zootaxa.5123.1.1, http://zenodo.org/record/6399827