Radomaniola filiola ( Westerlund, 1881 )

Jaszczyńska, Aleksandra, Grego, Jozef, Beran, Luboš, Hofman, Sebastian, Falniowski, Andrzej & Osikowski, Artur, 2025, Five new species of Radomaniola Szarowska, 2006 (Truncatelloidea: Hydrobiidae), Zootaxa 5716 (2), pp. 207-233 : 228-229

Radomaniola filiola ( Westerlund, 1881)

mOTU E

Shell ( Fig. 14A–C ) up to 2.28 mm high, ovate-conical, with moderately low spire, with about five whorls, spire height 23–28% of the shell height. Teleoconch whorls moderately convex, evenly rounded, growing regularly in diameter. Aperture ovoid, outer lip simple, parietal lip broad and complete, umbilicus slit-like. Teleoconch moderately thick-walled, its wall translucent, with delicate growth lines, periostracum yellowish. Protoconch ( Fig. 14D ) initially broad, growing abruptly, no sharp border between proto- and teleoconch, no distinct microsculpture. Operculum brownish, smooth on both surfaces.

Soft parts morphology and anatomy Head and mantle intensely pigmented black. Female reproductive organs as described by Delicado & Hauffe (2022). Penis ( Fig. 14E–F ) long and narrow, ribbon-shaped, sharply terminated. On the left side of the medial part of the penis there is double outgrowth, consisted of two delicate extensions, vas deferens well visible inside the penis.

Distribution and habitat Small springs in Greece, found at localities 17–19 ( Table 1, Fig. 1 ).

Figures

FIGURE 1. Studied localities. Colours indicate mOTUs as in Fig. 3. Two-color dots indicate localities where individuals belonging to two mOTUs were found.

FIGURE 14. Radomaniola filiola, locality 21:A–C—shells:A—2B2, B—2B3, C—dissected,bar equals 1 mm; D—protoconch, bar equals 100 µm; E–F—penes, bar equals 200 µm.