Proislandiana beroni, Dimitrov, 2020

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), Zootaxa 4743 (2), pp. 247-256 : 248-252

publication ID	https://doi.org/ 10.11646/zootaxa.4743.2.7
publication LSID	lsid:zoobank.org:pub:F4FF78DB-1568-457B-9A95-0B8915FE879C
DOI	https://doi.org/10.5281/zenodo.3688020
persistent identifier	https://treatment.plazi.org/id/03955567-FFB8-C71E-13E1-3BE0FDB2FE07
treatment provided by	Plazi
scientific name	Proislandiana beroni
status	sp. nov.

Treatment

Proislandiana beroni View in CoL new species

Figs 1–16 View FIGURES 1–4 View FIGURES 5–8 View FIGURES 9–12 View FIGURES 13–16

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 View FIGURES 1–4 , 5 View FIGURES 5–8 ), not bulged as in P. pallida ( Fig 17 View FIGURES 17–20 ), as well as by the shape of the characteristically twisted embolic membrane ( Figs 2 View FIGURES 1–4 , 6 View FIGURES 5–8 ) and the more curved prolateral tibial apophyse ( Figs 4 View FIGURES 1–4 , 8 View FIGURES 5–8 ), than in P. pallida ( Fig 20 View FIGURES 17–20 ). The females differ from those of P. pallida by the shorter and broader epigynal scape ( Figs 9, 11 View FIGURES 9–12 , 13, 15 View FIGURES 13–16 ). Seen from lateral view, the scape of P. beroni n. sp. looks like semi-ring ( Figs 10 View FIGURES 9–12 , 14 View FIGURES 13–16 ), unlike those of P. pallida which makes a full ring ( Fig 22 View FIGURES 21–24 ).

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 View FIGURES 1–4 View FIGURES 5–8 ). Tibia with two apophyses, one prolateral and another retrolateral ( Figs 4 View FIGURES 1–4 , 8 View FIGURES 5–8 ). 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 View FIGURES 1–4 , 5 View FIGURES 5–8 ). Embolus long, thin, curved out apically ( Figs 2–3 View FIGURES 1–4 , 6–7 View FIGURES 5–8 ). Ventral part of the embolic division small, semi-transparent. Embolic membrane large, coiled spirally ( Figs 2 View FIGURES 1–4 , 6 View FIGURES 5–8 ).

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 View FIGURES 9–12 View FIGURES 13–16 ). Scape simple, short and broad, with an upturned distal part, shaped as semi ring ( Figs 9–11 View FIGURES 9–12 , 13–15 View FIGURES 13–16 ). The dorsal median plate rectangular, notched ( Figs 12 View FIGURES 9–12 , 16 View FIGURES 13–16 ). Receptacles oval, ducts simple and strait ( Figs 12 View FIGURES 9–12 , 16 View FIGURES 13–16 ). The genital openings are on the dorsal side, near the tip.