Porrhomma campbelli F. O. Pickard-Cambridge, 1894

Růžička, Vlastimil, 2018, A review of the spider genus Porrhomma (Araneae, Linyphiidae), Zootaxa 4481 (1), pp. 1-75 : 20-21

Porrhomma campbelli F. O. Pickard-Cambridge, 1894

Figs. 15A–F .

Porrhomma campbelli F. O. Pickard-Cambridge, 1894 — F. O. Pickard-Cambridge (1894): p. 105 (descr. ♀), Pl. II, Fig. 5 (cephalothorax); examined by Jackson (1913).

P. campbelli — Jackson (1913): p. 44, Pl. II, Fig. 15 (♀ epigynum).

P. campbelli — Jackson (1916): p. 362 (descr. ♂).

P. campbelli — Fage (1933): p. 56, Fig. 2 (♂ palp).

P. campbelli — Miller & Kratochvíl (1940): p. 180, Figs. 7-1 , 8 (♂ ♀).

P. fagei Miller & Kratochvíl, 1940 — Miller & Kratochvíl (1940): p. 180, Figs. 7-2 , 9 (descr. ♂ ♀); synonymised by Thaler (1968).

P. campbelli — Thaler (1968): p. 375, Figs. 2d , 7a–e , 8a–b (♂ ♀); synonymy.

Material examined. CZECHIA: Lánov, 8 Jun 2004, 1 ♀; Stožec-Dobrá , 1 Jul 1980, 1 ♀, leg. A. Kůrka ( NMP). Stožec-Dobrá , 15 Jun 2012, 1 ♀, leg. V. Růžička. Harrachov , 6 Sep 1989, 1 Ƌ, 2 Aug 1990, 1 Ƌ, leg. J. Vaněk (IECA). SLOVAKIA: Vihorlat Mts., Vyšná Hurka Cave , 12 Jun 2001, 1 ♀, leg. A. Mock ( WSM) . UNITED KINGDOM, Berkshire, Cot Hill, 23 May 1968, 1 Ƌ ( AMNH) . ROMANIA: Bihor Mts., canyon Cheile Somesului Cald , 16 Jul 2001, 1 ♀, leg. M. Řezáč ( IECA) . RUSSIA: Sverdlovsk Area, Jul 2005, 2 ♀, leg. S.L. Esyunin ( PSU, No. 6207).

Diagnosis. Males of P. campbelli ( Fig. 15B ) are similar to those of P. montanum in having the AP short and curved upwards, but can be distinguished by presence of dorsal spines on Fe I–II. Females, having the simplest vulva (spermathecae are formed immediately behind the side loop), are similar to those of P. egeria and P. pallidum , from which it can be distinguished by details in vulva structure: appendices are oriented to the median line ( Figs. 15C, F ) and main sacks reach inside the abdomen, their tops are directed oblique laterally ( Fig. 15E ).

Description. ♀ (from Stožec-Dobrá, Czechia, 1 Jul 1980). Carapace yellow-brown, 0.77 mm wide, eyes reduced, PME–PME = 1.8 ( Fig. 15A ). Abdomen greyish-yellow. Fe I–II with one dorsal spine, Fe I with one prolateral spine. Ti I with one prolateral spine, Ti I–II with one retrolateral spine. Tm Mt I = 0.32, Mt I/CW = 0.88.

Aperture longer in comparison with P. egeria , translucent appendices oriented to the median line ( Fig. 15C ). Spermathecae start on the ascending part of copulatory ducts. In caudal view, main sacks reach inside the abdomen; their tops are directed oblique laterally. They are curved around appendices ( Figs. 15D–F ).

Ƌ (from Harrachov, Czechia, 6 Sep 1989). Embolus short with a broad velum, AP curved upwards ( Fig. 15B ).

Variation. Ƌ ♀. Carapace 0.75–0.79 mm wide, eyes sometimes very reduced, PME–PME> 1.8.Tm Mt I = 0.31–0.34, Mt I/CW = 0.77–1.01 (n = 6).

Ecology. Among moss in wet habitats, such as peat bogs, spruce forests, brook and pond margins.

Global distribution. Euroasia after Helsdingen (2017), Naumova et al. (2016), Mikhailov (in litt.), Otto (2017) and this article. See Fig. 16 .

Figures

FIGURE 2. A–B, Porrhomma pygmaeum, male palp. A, retrolateral view. B, prolateral view. Abbreviations: AP, anterior process of the embolic plate; DSA, distal suprategular apophysis; E, embolus; EM, embolic membrane; EP, embolic plate; PA, posterior apex of the embolic plate; PT-OP, protegulum, outer process; PT-IM, protegulum, inner membrane; ST, subtegulum; T, tegulum. Scale bar, 50 µm.

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

FIGURE 7. Porrhomma altaica new species from Altai Mts., Gor’ky Belok Mt. Ridge, male palp. Scale bar, 0.1 mm.

FIGURE 8. Global distribution of Porrhomma altaica new species.

FIGURE 15. A–F, Porrhomma campbelli from Stožec-Dobrá, Czechia; except B, Harrachov, Czechia. A, ♀ carapace, frontal view. B, embolic section. C, epigynum. D–F, vulva, ventral, caudal and dorsal. Scale bars, 0.1 mm.

FIGURE 16. Global distribution of Porrhomma campbelli.