Plagigeyeria reischuetzorum, 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 : 20-22

Plagigeyeria reischuetzorum sp. nov.

urn:lsid:zoobank.org:act:A15894D4-DED0-4678-938A-FE39F32E0C51

Figs 8A , 9 G–J

Type material

Holotype

BOSNIA AND HERCEGOVINA • 1 shell; Republika Srpska , Bileća Municipality , Berkovići , Vrelo “Vrijeka” in Dabarsko Polje NW of Bjeljani ( Fig. 2 B–G); 43.07472222° N, 18.23916667° E; 483 m a.s.l.; Aug. 2009; Alexander Reischütz, Nicole Steiner-Reischütz and Peter L. Reischütz leg.; NHMW 111678 .

Paratypes

BOSNIA AND HERCEGOVINA • 49 shells; same data as for holotype; NHMW 111679 /1, HNHM- MOLL-104165/1, coll. Reischütz /45, coll. Grego /2 • 21 shells; same locality as holotype; Mar. 2010; Alexander Reischütz , Nicole Steiner-Reischütz and Peter L. Reischütz leg.; coll. Reischütz /19, coll. Grego /2 • 3 shells; same locality as holotype; 31 Mar. 2018; J. Grego, D. Angyal, G. Jakaba and M. Olšavský leg.; SBMNH 626404 /1, coll. Grego /2 • 18 shells; same locality as holotype; 22 Apr. 2019; J. Grego, G. Jakab, M. Olšavský and M. Kováčiková leg.; coll. Grego /16 .

Other material

BOSNIA AND HERCEGOVINA • 3 shells; Republika Srpska, Bileća Municipality, Orahovice , Estavela “ Obod ” in Fatničko Polje ; 22 Apr. 2019; J. Grego, G. Jakab, M. Olšavský and M. Kováčiková leg.; 43.018543° N, 18.348643° E; 452 m a.s.l.; coll. Grego/3.

Dimensions

Holotype: H 2.73 mm; W 1.73 mm; BH 1.66 mm; BW 1.19 mm; AH 1.29 mm; AW 1.05 mm.

Paratypes:

H 2.51 mm; W 1.73 mm; BH 1.66 mm; BW 1.19 mm; AH 1.36 mm; AW 1.19 mm. H 2.64 mm; W 1.68 mm; BH 1.64 mm; BW 1.22 mm; AH 1.27 mm; AW 1.15 mm. H 2.42 mm; W 1.69 mm; BH 1.53 mm; BW 1.19 mm; AH 1.16 mm; AW 1.16 mm.

Etymology

Named after the Austrian malacologists Alexander and Peter L. Reischütz with Nicole Steiner-Reischütz, who were the first to collect the species in the type locality.

Description

Shell is narrow-conical, 2.7 mm high with rounded apex and yellowish corneous periostracum, with five convex pagoduline whorls with rather weak suture. Shell surface finely axially ribbed at late whorls of the teleoconch. Faintly cancellate nepionic whorls covered by 25 close-set spiral ribs. Density of spiral ribs apically decreasing at protoconch to 15 and fading out at malleate nucleus. Space among the protoconch ribs is covered by characteristically granulated surface. Umbilicus narrow slit-like and obscured by the strongly reflexed columellar marginal fold. Larger expanding reflexed trumpet-like aperture irregularly oval and attached to body whorl by a parietal callus. Peristome sharp, and strongly outward reflexed along the aperture outline. Outer lip lateral profile and columellar lip profile characteristically sinuous. Expanded aperture conspicuously protruded against shell outline at basal view.

Differentiating features

The shells of P. reischuetzorum sp. nov. differ from the specimens of P. mostarensis known from the spring of the Bunica River near Hodbina ( Fig. 5 A–C) by their more inflated whorls and less sinuated labral and columellar margins, as well by a more prominent and a less declined aperture at the shell lateral outline. Shell morphometry comparison with the related species is presented in the Table 1 .

Habitat

The type specimens were found in sediments washed out from the cave spring “Sušica Pećina” and its side permanent spring Vrelo “Vrijeka” (483 m a.s.l.) situated 100 m eastward from the cave and rising from debris under the road to Fatnica. It is a part of northern Bregava Basin, likely draining the karst waters from Lukavačko Polje (895 m a.s.l.) into Dabarsko Polje (472 m a.s.l.). During the sampling in March 2018 the adjacent parts of Dabarsko Polje were flooded by large spring outlets creating a vast lake.

Distribution

The new species is so-far known only from the type locality.

Figures

Fig. 8. A. Plagigeyeria reischuetzorum sp. nov., Bjeljani, Dabarsko Polje, Vrelo Vruljak, paratype (SBMNH 632724). B. P. pseudocostellina sp. nov., Blagaj, side spring of Buna at left bank, paratype (SBMNH 626414). C. P. mostarensis Kuščer, 1933, Blagaj Izvor Bune (SBMNH 626411). D. P. mostarensis Kuščer, 1933, Hodbina, Izvor Bunice (SBMNH 626405). Scale bars = 1 mm (SEM SBMNH Vanessa Delnavaz).

Fig. 9 (next page). A. Plagigeyeria erossi sp. nov., Mostar district, Komadinovo Vrelo at right bank of Neretva below Donja Jablanica, holotype (HNHM-MOLL- 104166). B–C. P. erossi sp. nov., type locality, paratypes (JG F0518, JG F1122). D. P. lewarnei sp. nov., Trebinje district, Gorica, cave Vruljak, holotype (HNHM-MOLL-104176). E. P. listicaensis sp. nov., Široki Brijeg, Bilo Vrelo (Lištica 2), holotype (HNHM-MOLL-104168). F. P. listicaensis sp. nov., type locality, paratype (JG F1250). G–H. P. reischuetzorum sp. nov., Dabarsko Polje, Vrelo Vrijeka. G. Paratype (HNHM-MOLL-104165). H. Paratype (JG F1173). I. P. reischuetzorum sp. nov., type locality, holotype (NHMW 111678). J. P. reischuetzorum sp. nov., type locality, paratype (JG F1158). K–L. Travunijana gloeri sp. nov., Dabarsko Polje, Vrelo Vrijeka. K. Holotype (HNHM-MOLL-104418). L. Paratype (JG F1340).

Fig. 2. Photos of studied localities in Hercegovina. A. Konjic. Ljuta spring (LT of Plagigeyeria ljutaensis sp. nov.). B. Blagaj, spring Buna (P. mostarensis var.). C. Konjic, spring at left bank of Ljuta Rivulet (LT of P. konjicensis sp. nov.). D. Donja Jablanica, Komadinovo Vrelo (LT of P. erossi sp. nov.). E. Vučija, Sušicka Jama (P. cf. lewarnei sp. nov.). F. Trebinje, Gorica, spring Vruljak 1 (P. robusta and P. lewarnei sp. nov.). Photos: Jozef Grego, Dorottya Angyal and Mário Olšavský.

Fig. 5 (next page). A. Plagigeyeria plagiostoma (A. J. Wagner, 1914), from Vrelo Bosne in Ilidža, (topotype JG F1116). B. Travunijana vruljakensis Grego & Glöer, 2019, Gorica near Trebinje, spring Studenac (holotype HNHM-MOLL-104416). C. P. inflata (A. J. Wagner, 1928), from Vrelo Bosne in Ilidža (topotype JG F1117). D. P. ljutaensis sp. nov., Konjic district, spring of River Ljuta (holotype HNHM-MOLL-104180). E. P. konjicensis sp. nov., small spring at left bank of Ljuta River, 600 m downstream of the main spring (holotype HNHM-MOLL-104174); F–G. P. olsavskyi sp. nov., Studenci, spring Kajtazovina F. Holotype (HNHM-MOLL-104178). G. Paratype (JG F1192). H–I. P. olsavskyi sp. nov., Ljubuški district, Donji Proložac, spring Mali Prokop (JG F1209).