Paladilhiopsis (Lanzaia) matejkoi Grego and Glöer, 2019

Grego, Jozef, Glöer, Peter, Falniowski, Andrzej, Hofman, Sebastian & Osikowski, Artur, 2019, New subterranean freshwater gastropod species from Montenegro (Mollusca, Gastropoda, Moitessieriidae, and Hydrobiidae), Ecologica Montenegrina 20 (2019), pp. 71-90 : 77-78

Paladilhiopsis (Lanzaia) matejkoi Grego and Glöer , n. sp.

( Figs. 19–21 )

Type locality

Montenegro, Herceg Novi , left side spring of Nemila rivulet, on turn of Spasića i Masare street, 42.456214°N; 18.538386°E, ( Fig. 1E ) .

Type material

Holotype: Type locality, J. Grego leg., 26.07.201 6 ( HNHM 103043 ) . Paratypes: same data ( NHMW 111666 /2, OSUM 42390 /2, NHMUK 20180025 /2, SMF 349440 /2, CNHM 11480/2; FMNH 384780/2, NMBE 554115/2, MNHN-IM-2014-6894/2, FLMNH UF510442/2, RMNH.MOL.290816/2, MUZSP 138303/2, coll. Glöer /1, coll. Grego /59,) ; same data, Z. P. Erőss and Z. Fehér leg., 17.07.201 7 ( HNHM 103044 /64, col. ZPE/60, coll. Grego /19); 714 JG/24 HNHM 76 .

Other material

A similar but smaller and smoother form had been reported by Schütt 1960 from Risan Velika Špilja cave at NE Bank of Kotor Bay ( SMF 194006), erroneously assigned to Saxurinator montenegrinus , and could possibly represent the subspecies of P. matejkoi n. sp.

Measurements

Holotype: H 2.31 mm; W 1.01 mm; BH 1.17 mm; BW 0.61 mm; AH 0.75 mm; AW 0.65 mm.

Etymology

Named after Matej Grego, who participated on the discovery of new species and is the younger son of the first author.

Description

Solid elongate milky-yellowish conical shell (2.31 mm) with blunt apex and six convex whorls separated by a deep suture. Shell surface smooth and shiny with faint axial ribs. Umbilicus open, slit-like and obscured by reflected columellar margin. Aperture ovoid, attached to body whorl at its upper columellar part. Peristome blunt, reflected at columellar part. Outer lip profile weakly sinuous in lateral view and parallel to the columellar axis. In frontal view labral margin protrudes from body whorl.

Differentiating features

The morphologically and geographically closest species to Paladilhiopsis matejkoi n. sp. is the Saxurinator montenegrinus Schütt, 1959 (Hercegovina, Bileća), from which it differs by its more oval aperture, much less sinuous labral margin, more open umbilicus, and different lateral profile of anterior body whorl (Tab. 2). The geographically close Lanzaia edlaueri Schütt, 1961 (Figs. 25-27) and Lanzaia vjetrenicae Kušĉer, 1933 have more elongate shells with sinuous axial ribs and differently shaped expanded apertures.

Tab. 2 Shell morphometry comparison of Paladilhiopsis matejkoi n. sp. with related species and forms: Anatomy

The penis ( Fig. 9 ) straight, without surface protrusions, with a broad base and long and slender filament, vas deferens easily visible inside. The female reproductive organs typical of the Paladilhiopsis ( Hofman et al. 2018) , not illustrated since the specimen was not well fixed.

Molecular data

Paladilhiopsis matejkoi clearly belongs to the Paladilhiopsis clade based on COI as well as for H3 loci ( Figs. 10 , 11 ), but it is different from all the other species of Paladilhiopsis . It differs from other Paladilhiopsis species at 9.9 – 12.5% for COI and 1.6 – 6.2% for H3.

Distribution

Known only from the type locality and a spring 300 m E of type locality, where it occurs syntopically with more scarce S. hercegnoviensi s n. sp.

The type locality is a small spring on the right bank of the Nemila rivulet. The no longer-used stony water reservoir indicates its historical importance, but even now the active well is used as a water supply to the adjacent houses. The spring zone is covered by dense vegetation and is inhabited by Litthabitella chilodia (Westerlund, 1886) . The new stygobiont species was also found in another spring situated near the left bank of Nemila about 300 m downstream from the type locality and likely inhabits the groundwater aquifers of the whole Nemila tributary upstream to the large seasonal springs at the northern end of its valley.

Figures

Figure 1. Type localities (LT) of the new species (red dots) and faunistical records mentioned in this paper (blue dots): 1. Herceg Novi, Nemila (LT of Paladilhiopsis matejkoi n. sp.); 2. Herceg Novi- Meljine Hospital (LT of Stygobium hercegnoviensis n. sp. and Plagigeyeria feheri n. sp.); 3. Herceg Novi, Zelenika - Kuti (S. hercegnoviensis n. sp. and LT of Paladilhiopsis cattaroensis n. sp.); 4. Herceg Novi, Trebesinj (S. hercegnoviensis n. sp.); 5. Herceg Novi, Sušćepan (S. hercegnoviensis n. sp.); 6. Vitoja (LT of Bosnidilhia vitojaensis n. sp.); 7: Bileĉa, Trebinjĉica, (LT of Saxurinator montenegrinus); 8. Risan, Velika Špilja (Paladilhiopsis cf. matejkoi and LT of Plagigeyeria pageti forma minor).

Figure 10. Maximum likelihood tree of the selected Hydrobiidae and Moitessieriidae compared to P. matejkoi n. sp. and Stygobium hercegnoviensis n. sp., computed for H3; bootstrap supports given if>50% and Bayesian probabilities if>50

Figure 11. Maximum likelihood tree of the selected Hydrobiidae and Moitessieriidae compared to P. matejkoi n., computed for COI; bootstrap supports given if>50% and Bayesian probabilities if>50.

Figures 12–24. Discussed species of the genus Saxurinator (= Paladilhiopsis) and Lanzaia: 12-15 Saxurinator montenegrinus Schütt, 1959 = Paladilhiopsis (Lanzaia) montenegrinus comb. nov. (SMF 162035); 16–18 Paladilhiopsis (Lanzaia) cf. matejkoi n. sp. from cave Velika Špilja, Risan (SMF 194006); 19–21 Paladilhiopsis (Lanzaia) matejkoi n. sp. (Holotype HNHM 103043); 22–24 Holotype of Saxurinator schlickumi Schütt, 1960 = Paladilhiopsis schlickumi comb. nov. (SMF 163504); 26–28 Lazaia edlaueri Schütt, 1961= Paladilhiopsis (Lanzaia) edlaueri comb. nov. (Holotype SMF 164353); 28-30 Paladilhiopsis (Lanzaia) cf. montenegrinus from spring Ĉepo in Bileća (SMF 194005); (photos: Sigrid Hof, Peter Glöer, Jozef Grego).

Fig. 9. The penis of Paladilhiopsis (Lanzaia) matejkoi n. sp.