Porrhomma oblitum ( O. Pickard-Cambridge, 1871 )

Růžička, Vlastimil, 2018, A review of the spider genus Porrhomma (Araneae, Linyphiidae), Zootaxa 4481 (1), pp. 1-75 : 48

publication ID	https://doi.org/10.11646/zootaxa.4481.1.1
publication LSID	lsid:zoobank.org:pub:BFC4982D-BB84-4141-BDFD-203F23CD1585
DOI	https://doi.org/10.5281/zenodo.5963998
persistent identifier	https://treatment.plazi.org/id/03C6A93B-FFF9-FFFA-FF7C-FDC582713E4D
treatment provided by	Plazi (2018-10-10 13:35:00, last updated 2024-11-29 11:22:35)
scientific name	Porrhomma oblitum ( O. Pickard-Cambridge, 1871 )
status

Treatment

Porrhomma oblitum ( O. Pickard-Cambridge, 1871) View in CoL

Figs. 41A–F View FIGURE 41 .

Linyphia oblita O. Pickard-Cambridge, 1871 — O. Pickard-Cambridge (1871): p. 432 (descr. ♂); examined and transferred by Jackson (1913).

Neriene pallipes O. Pickard-Cambridge, 1871 View in CoL — O. Pickard-Cambridge (1871): p. 437 (descr. ♂); examined and synonymised by Jackson (1913).

Porrhomma oblitum View in CoL — Jackson (1913): p. 39, Pl. II, Figs. 23 View FIGURE 23 , 33 View FIGURE 33 (♂ ♀); synonymy.

P. oblitum — Merrett (1994): p. 318, Figs. 5–6 View FIGURE 5 View FIGURE 6 (♀).

Material examined. CZECHIA: Lovosice, Lovoš Hill , 25 May –14 Jun 1980, 1 ♂; Lanžhot , Ranšpurk Reserve , 5 Jun 1996, 1 ♀; Sedlec , Lednické Rybníky Ponds Reserve , 16 Jul 1996, 1 ♀, leg. V. Růžička ( IECA). Šumava Mts. , Mrtvý Luh Reserve, 22 May 1980, 1 ♀, leg. A. Kůrka (CAK). Lanžhot, Soutok Reserve, 1996–1997, 5 Ƌ 5 ♀, leg. et coll. L. Kubcová . RUSSIA: Orenburskaya (= Orenburg) Area, Aytuar , 22 May 1997, leg. S.L. Esyunin, 4 Ƌ 6 ♀ ( PSU, No. 2840).

Diagnosis. Small species (CW <0.60 mm), Fe I–II without dorsal spines, AP has the form of a bird head, Sshaped ascending parts of copulatory ducts. It is closely similar to P. cambridgei , but it can be distinguished by pigmented body and normal eyes ( Fig. 41A View FIGURE 41 ).

Description. ♀ (from Lanžhot, Czechia, 1 Oct 1996). Carapace brown, 0.57 mm wide, eyes normal, PME– PME = 0.8 ( Fig. 41A View FIGURE 41 ). Abdomen gray. Fe without dorsal spines, Fe I with one prolateral spine. Ti I with one prolateral spine, Ti I–II with one retrolateral spine. Tm Mt I = 0.44, Mt I/CW = 0.72.

Ascending parts of the ducts are S-shaped. Spermathecae are formed behind the ascending part of the ducts. Long appendices can be seen on the epigynum ( Fig. 41C View FIGURE 41 ) and vulva ( Figs. 41D–F View FIGURE 41 ).

Ƌ (together with female). Embolus of middle length with a narrow velum. ARP has the form of a bird head ( Fig. 41B View FIGURE 41 ).

Variation. Ƌ ♀. Carapace 0.53–0.61 mm wide. Tm Mt I = 0.37–0.45, Mt I/CW = 0.68–0.79 (n = 14).

Ecology. The species lives in wet open and forest habitats and is abundant in litter and under tree bark in floodplain forests ( Kubcová & Schlaghamerský 2002).

Global distribution. Europe after Helsdingen (2017) and this article. See Fig. 42 View FIGURE 42 .

Figures

FIGURE 5. A–C, female vulva, lateral view. A, Porrhomma pygmaeum. B, Porrhomma microcavense. C, Porrhomma microps. Scale bars, 0.1 mm.

FIGURE 6. A–F, Porrhomma altaica new species from Altai Mts., Azutau Ridge. A, ♂ carapace, frontal view. B, embolic section. C, epigynum. D–F, vulva, ventral, caudal and dorsal. Abbreviations: A, appendix; AP, anterior process of the embolic plate; E, embolus; MS, main sack; PA, posterior apex of the embolic plate; V, velum. Scale bars, 0.1 mm.

FIGURE 23. A–F, Porrhomma errans from Chrast, Czechia. A, ♀ carapace, frontal view. B, embolic section. C, epigynum. D– F, vulva, ventral, caudal and dorsal. Scale bars, 0.1 mm.

FIGURE 33. A–C, tip of the embolus. A, Porrhomma microphthalmum from České Budějovice, Czechia. B, Porrhomma profundum from Domica Cave, Slovakia. C, Porrhomma microps from Horka nad Moravou, Czechia. Scale bars, 0.1 mm.

FIGURE 41. A–F, Porrhomma oblitum from Lanžhot, Czechia. A, ♀ carapace, frontal view. B, embolic section. C, epigynum. D–F, vulva, ventral, caudal and dorsal. Scale bars, 0.1 mm.