Plagigeyeria reischuetzorum Grego 2020, sp. nov.
Creators: name: Grego, Jozef
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Littorinimorpha
Hydrobiidae
Plagigeyeria
Plagigeyeria reischuetzorum

description: 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.
description: Published as part of 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, pp. 1-56 in European Journal of Taxonomy 691 on pages 20-22, DOI: 10.5852/ejt.2020.691, http://zenodo.org/record/3961840