Adiscoacrilla laticostata ( Bałuk, 1975 )

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 : 26-27

publication ID	https://doi.org/10.11646/zootaxa.5630.1.1
publication LSID	lsid:zoobank.org:pub:89462472-D932-4255-880F-C6EF15220A31
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treatment provided by	Plazi
scientific name	Adiscoacrilla laticostata ( Bałuk, 1975 )
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Adiscoacrilla laticostata ( Bałuk, 1975)

Figs 7G View FIGURE 7 , 10B View FIGURE 10 1 –B View FIGURE 1 2 View FIGURE 2

* Acrilla (Acrilla) laticostata sp. n. — Bałuk 1975: 177, pl. 21, fig. 8.

Type material. Holotype, Z.PAL. U.W., BkK-G 35, SL: 5.0 mm, MD: 2.6 mm, Korytnica ( Poland), illustrated in Bałuk (1975: pl. 21, fig. 8), Figs 7G View FIGURE 7 , 10B View FIGURE 10 1 –B View FIGURE 1 2 View FIGURE 2

Revised description. Small, thin-shelled, moderately broad, conical (apical angle 33–35°), gradate, coronate. Protoconch multispiral conical, of about four smooth, slightly convex whorls [fide Bałuk 1975: 177]. Teleoconch of six relatively low, convex whorls with narrow, weakly concave subsutural shelf, marked shoulder angulation, subcylindrical below, with periphery placed mid-whorl. Suture deeply impressed. Sculpture of close-set, moderately raised, prosocline lamellae with short, trigonal spine at shoulder (14/16: ~24: ~33). Crests of lamellae weakly rolled over on later whorls. Interspaces with numerous, delicate spiral threads. Last whorl attaining about 50% of total height, with weak basal angulation bordering flattish base. Lamellae strongly rolled over on base. Aperture ovate, columella weakly concave. Columellar callus forming narrow rim, detached from base; parietal callus narrow. Peristome slightly thickened. Umbilicus reduced to narrow chink.

Discussion. Adiscoacrilla villalvernensis ( Sacco, 1891) , from the Pliocene of the Mediterranean Sea, differs in its wider spaced lamellae and weaker shoulder angulation (see Landau et al. 2006: pl. 13, figs 9–10, pl. 14, fig 1). Superficially similar, Anguloacrilla kimakowiczi ( Boettger, 1896) differs at the same growth stage in its more convex whorls and convex axial ribs. Anguloacrilla karamanensis sp. nov. lacks the distinct subsutural shelf at same growth stage. As well as these differences, Anguloacrilla nov. gen. species have a more strongly developed basal disc.

Paleoenvironment. Unknown.

Distribution in Central Paratethys. Badenian (Middle Miocene): Korytnica Basin: Korytnica ( Poland) ( Bałuk 1975).