Cirsotrema cf. fontannesi Cossmann & Peyrot, 1922

Harzhauser, Mathias & Landau, Bernard M., 2025, The Epitoniidae (Gastropoda, Epitonioidea) of the Miocene Central Paratethys Sea-an overwhelming diversity, Zootaxa 5630 (1), pp. 1-142 : 42

publication ID	https://doi.org/10.11646/zootaxa.5630.1.1
publication LSID	lsid:zoobank.org:pub:89462472-D932-4255-880F-C6EF15220A31
persistent identifier	https://treatment.plazi.org/id/03D787A4-FFCC-FFCD-FF3F-FD36FF5C910F
treatment provided by	Plazi
scientific name	Cirsotrema cf. fontannesi Cossmann & Peyrot, 1922
status

Treatment

Figs 14F View FIGURE 14

* Cirsotrema Fontannesi de Boury View in CoL mss. in sch[edis].— Cossmann & Peyrot 1922: 145, pl. 4, fig. 66.

? Cirsotrema fontannesi de Boury — Kochansky-Devidé 1956: 40.

cf. Scala (Cirsotrema) fontannesi de Bourry [sic]— Csepreghy-Meznerics 1969a: 22, pl. 4, fig. 7.

cf. Scala (Cirsotrema) fontannesi de Bourry [sic]— Csepreghy-Meznerics 1969b: 74, pl. 2, fig. 5.

Type material. Holotype, MD: 10.5 mm, Saubrigues ( France), illustrated in Cossmann & Peyrot (1922: pl. 4, fig. 66).

Illustrated material. M.70.412, SL: 26.0 mm, MD: 18 mm, Balaton ( Hungary), illustrated in Csepreghy-Meznerics (1969a; pl. 4, fig. 7), Figs 14F View FIGURE 14 1 –F View FIGURE 1 2 View FIGURE 2 .

Description. Fragment of a large solid shell comprising penultimate whorl and last whorl. Whorls convex with weakly convex subsutural ramp and periphery placed mid-whorl. Sculpture of prominent, broad, internally densely lamellose, prosocline varices separated by interspaces of about equal width. Varices obliquely aligned axially, fused across suture (?:16: 15). Spiral sculpture of one weak cord on subsutural ramp and three very prominent cords along periphery, forming elongate nodes on crests of varices. Sharp basal angulation with weak peribasal cord. Basal disk flat with broad varices. Aperture subcircular. Columellar and parietal callus continuous, forming narrow, adherent rim. Peristome duplex. No umbilicus.

Discussion. Cirsotrema fontannesi Cossmann & Peyrot, 1922 was based on a fragmentary specimen and remains a poorly understood species. The illustration in Cossmann & Peyrot (1922) is indeed reminiscent of the specimen from the Middle Miocene of Hungary, which was identified as the French species by Csepreghy-Meznerics (1969a, b). We tentatively follow Csepreghy-Meznerics (1969a, 1969b) and consider the Paratethyan shell probably conspecific with the French specimen. The available specimen is strikingly similar to Cirsotrema crassicostanomalum ( Sacco, 1891) and attains an identical size but has narrower varices, which lack a lamellose internal.

Cirsotrema pedemontanum ( Sacco 1891) (= Cirsotrema rotundicosta ( Sacco, 1891) , from the Early or Middle Miocene of Italy, differs in its broader, nearly orthocline varices and less prominent spiral cords ( Sacco 1891: pl. 2, figs 14–15). Cirsotrema subaspromontanum ( Sacco 1891) , from the Tortonian (Late Miocene) of Italy, agrees in the prominent spiral cords, but differs in its subcylindrical whorls and the strongly angled base ( Sacco 1891: pl. 2, fig. 18).

Distribution in Central Paratethys. Badenian (Middle Miocene): Bükk Mountains: Balaton ( Hungary) ( Csepreghy-Meznerics 1969a). This species was also mentioned by Kochansky-Devidé (1956) from Zagreb ( Croatia) but this record will need verification

Northeastern Atlantic. Tortonian (Late Miocene): Aquitaine Basin: Saubrigues ( France) ( Cossmann & Peyrot 1922).