Proislandiana beroni Dimitrov 2020, new species
Creators: name: Dimitrov, Dragomir
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Linyphiidae
Proislandiana
Proislandiana beroni

description: Proislandiana beroni new species
Figs 1–16
Type material. Holotype. ♂. Turkey, Ararat Mountain, Agri Dag, 4000–4200 m, 20.08.2010, Boyan Petrov leg (NMNHS). Paratypes. 1 ♂, 1 ♀ with the same data as the holotype (MHNG); 1 ♀ with the same data as the holo- type; 2 ♀. Armenia, Aragats Mountain, 3500–3600 m, 03.08.1988, Petar Beron leg (NMNHS).
Etymology. Named after the well-known Bulgarian arachnologist and biospeleologist Petar Beron who collected part of the paratypes.
Diagnosis. The new species Proislandiana beroni n. sp. is very close to Proislandiana pallida (Kulczyński, 1908). Males can be distinguished by the smaller and unmodified paracymbium (Figs 1, 5), not bulged as in P. pallida (Fig 17), as well as by the shape of the characteristically twisted embolic membrane (Figs 2, 6) and the more curved prolateral tibial apophyse (Figs 4, 8), than in P. pallida (Fig 20). The females differ from those of P. pallida by the shorter and broader epigynal scape (Figs 9, 11, 13, 15). Seen from lateral view, the scape of P. beroni n. sp. looks like semi-ring (Figs 10, 14), unlike those of P. pallida which makes a full ring (Fig 22).
Description. Male. Measurements. Total length 1.92; carapace length 0.80, width 0.58; sternum length 0.47, width 0.40; abdomen length 1.12, width 0.68; clypeus length 0.13; chelicerae length 0.35; eye diameters AME 0.035, ALE 0.050, PME 0.050, PLE 0.050; leg measurements I—2.43 (0.30, 0.61, 0.22, 0.54, 0.40, 0.36), II—2.23 (0.22, 0.61, 0.20, 0.43, 0.42, 0.35), III—1.74 (0.18, 0.32, 0.15, 0.40, 0.37, 32), IV—2.56 (0.25, 0.65, 0.18, 0.60, 0.50, 0.38); palpal cymbium length 0.30.
Carapace unmodified. Chelicerae with four large, sharp promarginal and four small retromarginal teeth. The retromarginal teeth located in the distal part of the chelicerae, near the cheliceral fang.
Coloration. Carapace, chelicerae and legs yellow to pale orange. Sternum a little darker than the carapace. Abdomen whitish-gray, without pattern, covered with small dark hairs.
Dorsal tibial spination 2, 2, 2, 1. The position of TmI—0.44.
Palp (Figs 1–8). Tibia with two apophyses, one prolateral and another retrolateral (Figs 4, 8). The retrolateral one small, curved, narrowing apically. The prolateral one long, thin and curved, shaped as an arc behind the cymbium. Cymbium simple, covered with thin black hairs. Paracymbium curved, the distal part deeply notched on the inner side, forming a hook. The base of paracymbium bears 3 stout spines near the tip (Figs 1, 5). Embolus long, thin, curved out apically (Figs 2–3, 6–7). Ventral part of the embolic division small, semi-transparent. Embolic membrane large, coiled spirally (Figs 2, 6).
Female. Measurements. Total length 2.31; carapace length 0.83, width 0.58; sternum length 0.47, width 0.40; abdomen length 1.48, width 0.90; clypeus length 0.14; chelicerae length 0.36; eye diameters AME 0.036, ALE 0.055, PME 0.55, PLE 0.055; leg measurements I—2.48 (0.32, 0.61, 0.22, 0.54, 0.43, 0.36), II—2.36 (0.32, 0.58, 0.20, 0.50, 0.40, 0.36), III—2.09 (0.24, 0.54, 0.20, 0.40, 0.39, 32), IV—2.81 (0.32, 0.70, 0.22, 0.65, 0.54, 0.38).
Chelicerae with four large teeth on promargin and four small ones on retromargin. The arrangement is the same as in male, but the promarginal teeth are bigger.
Epigynum (Figs 9–16). Scape simple, short and broad, with an upturned distal part, shaped as semi ring (Figs 9–11, 13–15). The dorsal median plate rectangular, notched (Figs 12, 16). Receptacles oval, ducts simple and strait (Figs 12, 16). The genital openings are on the dorsal side, near the tip.
Coloration as in male. Dorsal tibial spination 2, 2, 2, 1. The position of TmI—0.46.
Distribution. Known only from two localities in the high altitude belt (3500–4200 m) of Ararat Mountain (Turkey) and Aragats Mountain (Armenia).
description: Published as part of Dimitrov, Dragomir, 2020, A review of the linyphiid spider genus Proislandiana Tanasevitch, 1985 with description of a new high mountainous species from Turkey and Armenia (Araneae: Linyphiidae), pp. 247-256 in Zootaxa 4743 (2) on pages 248-252, DOI: 10.11646/zootaxa.4743.2.7, http://zenodo.org/record/3687851