Plagigeyeria listicaensis, Grego, 2020

Grego, Jozef, 2020, Revision of the stygobiont gastropod genera Plagigeyeria Tomlin, 1930 and Travunijana Grego & Glöer, 2019 (Mollusca; Gastropoda; Moitessieriidae and Hydrobiidae) in Hercegovina and adjacent regions, European Journal of Taxonomy 691, pp. 1-56 : 29-31

Plagigeyeria listicaensis , sp. nov.

urn:lsid:zoobank.org:act:BBEACB84-641D-4E59-B97A-C748FF43816F

Figs 7 E–F, 8B

Type material

Holotype

BOSNIA AND HERCEGOVINA • 1 shell; Bosnian Federation , West Herzegovina Canton , Široki Brijeg, Vrelo Lištica 2 (BiloVrilo) 1 km north of the city ( Fig. 4B ); 43.396392° N, 17.596437° E; 319 m a.s.l.; 2 Apr. 2018; J. Grego, D. Angyal, G. Jakab and M. Olšavský leg.; HNHM-MOLL-104168.

Paratypes

BOSNIA AND HERCEGOVINA • 37 shells; same data as for holotype; HNHM-MOLL-104169/1, SBMNH 626250 /4, coll. Grego /31, coll. Glöer /1 .

Dimensions

Holotype: H 2.00 mm; W 1.30 mm; BH 1.23 mm; BW 1.03 mm; AH 0.91 mm; AW 0.81 mm.

Paratype: H 2.21 mm; W 1.47 mm; BH 1.28 mm; BW 1.09 mm; AH 0.98 mm; AW 0.88 mm.

Etymology

Named after the type locality in the springs of Lištica River in the vicinity of Široki Brijeg.

Description

Solid elongate-conical shell, 2.0 mm high, apex blunt, slightly elevated protoconch, with four convex whorls and deep suture. Shell colour is translucent-whitish. Teleoconch surface covered by fine axial ribs and fine, close-set spiral cords forming a distinct cancellate structure. With dominating axial ribs. Nepionic whorl covered by 25 wavy granulose close-set spiral ribs connected by granulose irregular structures fusing at malleate apex. Open umbilicus, partly obscured by reflexed columellar margin. The elongate-oval reflexed aperture attached to body whorl by a narrow sulcus. Peristome reflexed along the aperture outline. Outer lip weakly sinuous, straight at its columellar side and slightly protruded adapically. Columellar lip with straight lateral profile. Aperture at basal view stepwise protruded against body whorl.

Differentiating features

Compared to P. olsavskyi sp. nov., differs by its broader, more conical shell, less blunt protoconch, a proportionally larger aperture, more closed umbilicus and more coarsely sculptured protoconch. Shell morphometry comparison with the related species is presented in the Table 2.

Habitat

The type locality consists of two large karst spring risings at Lištica valley 1 km north of Široki Brijeg at 319 m a.s.l. The southern spring is captured for a water supply, while the northern one has a deep spring lake with free outflows through old water mill ruins, where the sandy sediment samples were taken. The spring is most likely getting its water through karst conduits from Rakitno Polje (890 m a.s.l.) and from the sinkholes around the upper Ugrovača River.

Distribution

The species is known only known from the type locality.

Figures

Fig. 7 (next page). A. Plagigeyeria mostarensis, Kuščer 1933, holotype, from Kuščer 1933, assigned to Izvor Buna in Blagaj but rather represents the form from near spring Bunica in Hodbina. B. P. mostarensis, hypotype of Schütt, 1970, from spring Bunica (SMF 221236). C. P. mostarensis, likely topotype from spring Bunica (JG F1146). D–E. P. mostarensis var., from spring of Buna assigned as type locality (JG F0536). Fa–Fb. Paladilhiopsis (Costellina) turrita (Kuščer, 1933) paratype and holotype from Kuščer 1933, spring Izvor in valley of river Jadro near Split. G. P. pseudocostellina sp. nov., left bank side spring of river Buna 400 m from main spring (holotype HNHM-MOLL-104164). H. P. pseudocostellina sp. nov., left bank side spring of river Buna 200 m from main spring (paratype JG F1140). I. Travunijana ovalis (Kuščer, 1933), holotype from Kuščer, assigned to Izvor Buna in Blagaj but not found in assigned locality, only in spring Bunica in Hodbina. J–K. T. ovalis (Kuščer, 1933), spring Bunica near Hodbina (JG F1145). L. T. robusta (Schütt, 1959), Trebinje district, Tučevac spring at right bank of Trebišnjica River (JG F1163). M. T. robusta, Trebinje district, Gorica, cave Vruljak 1 (JG F0831). N. T. robusta asculpta (Schütt, 1972), spring Ombla (Dubrovačka Rijeka) at Komolac near Dubrovnik (JG F1080).

Fig. 4. Photos of studied localities in Hercegovina. A. Studenci, Vrilo Guljevina (LT of Plagigeyeria jakabi sp. nov.). B. Široki Brijeg, Bijelo Vrelo – Lištica 2 (LT of P. listicaensis sp. nov.) C. Donji Prolog, spring Mali Prokop (P. olsavskyi sp. nov.). Photos: Jozef Grego, Dorottya Angyal and Mário Olšavský.