Porrhomma montanum Jackson, 1913

Růžička, Vlastimil, 2018, A review of the spider genus Porrhomma (Araneae, Linyphiidae), Zootaxa 4481 (1), pp. 1-75: 43

publication ID

https://doi.org/10.11646/zootaxa.4481.1.1

publication LSID

lsid:zoobank.org:pub:BFC4982D-BB84-4141-BDFD-203F23CD1585

persistent identifier

http://treatment.plazi.org/id/03C6A93B-FFFC-FFFF-FF7C-FE1C84053EBA

treatment provided by

Plazi

scientific name

Porrhomma montanum Jackson, 1913
status

 

Porrhomma montanum Jackson, 1913  

Figs. 36A –F View FIGURE 36 .

Linyphia hebescens L. Koch, 1879   —L. Koch (1879): p. 35, Pl. 1, Figs. 23, 23a View FIGURE 23 (descr. ♀); examined by Holm (1973: 97) and suppressed for lack of usage.

L. desolata L. Koch, 1879   —L. Koch (1879): p. 38, Pl. 1, Figs. 27, 27a View FIGURE 27 (descr. ♂); examined by Holm (1973: 97) and suppressed for lack of usage.

Erigone formosa L. Koch, 1879   —L. Koch (1879): p. 67, Pl. 2, Figs. 18, 18a View FIGURE 18 (descr. ♀); examined by Holm (1973: 97) and suppressed for lack of usage.

Porrhomma montanum Jackson, 1913   — Jackson (1913): p. 40, Pl. II, Figs. 24 View FIGURE 24 , 34 View FIGURE 34 (descr. ♂ ♀).

P. hakusanensis Oi, 1964   —Oi (1964): p. 29, Pl. I, Figs. 11–12 View FIGURE 11 View FIGURE 12 (descr. ♀); synonymised by Ono et al. (2009).

P. montanum   — Holm (1973): p. 97; synonymy.

P. hebescens   — Eskov & Marusik (1993): p. 67; resurrected older name, but P. montanum   clearly eligible for protection under ICZN Article 23.9 ( World Spider Catalog 2017).

P. hebescens   — Ono et al. (2009): p. 332, Pl. 2-2-41, Figs. 1105–1109 (♂ ♀); synonymy.

Material examined. CZECHIA. Chlum u Třeboně , Novořecké Močály Reserve , 3 Sep 1987 –30 May 1988, 1 ♂; Suchdol nad Lužnicí , Dvory nad Lužnicí , 12–28 May 1986, 1 Ƌ, V. Růžička. Nižbor, Vůznice Reserve, 1–17 May 1993, 3 Ƌ, F. Pojer ( IECA). Šumava Mts., Mrtvý Luh Reserve, 1 Jul 1980, 5 Ƌ, leg. A. Kůrka (CAK). Lanžhot, Ranšpurk Reserve   , 1994–1997, 9 Ƌ 4 ♀, leg. J. Chytil (WSM). RUSSIA: Kurile Islands , Paramushir Island , Severo-Kurilsk env., 50°40'N, 156°06'E, 10 Aug –5 Oct 1996, 2 ♀, leg. Yu. M. Marusik (CYM). GoogleMaps  

Diagnosis. Species of middle size (CW> 0.60 mm), lacking dorsal spines of Fe I –II. It can be distinguished from P. altaica   by AP of the male palp short and curved upwards ( Fig. 36B View FIGURE 36 ), and thick appendices of the vulva, which turn closely around main sacks and are oriented opposite to one another, towards the median plain ( Figs. 36D –F View FIGURE 36 ).

Description. ♀ (from Lanžhot, Czechia, 19 May 1997). Carapace brown, 0.67 mm wide, eyes normal, PME – PME = 0.8 ( Fig. 36A View FIGURE 36 ). Abdomen grey. 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 = 0.33, Mt I/CW = 0.90.

Main sacks and appendices, which are almost in contact, can be seen on the epigynum ( Fig. 36C View FIGURE 36 ). Very compact vulva. Spermathecae start at the midway of the ascending part of the copulatory ducts. Main sacks are oriented oblique upwards. Thick appendices turn closely around main sacks and are oriented opposite to one another, towards the median plain ( Figs. 36D –F View FIGURE 36 ).

Ƌ (together with female). Embolus short, AP short and curved upwards ( Fig. 36B View FIGURE 36 ).

Variation. Ƌ ♀. Carapace 0.60–0.69 mm wide. Tm Mt I = 0.31–0.36, Mt I/CW = 0.81–0.93 (n = 21).

Ecology. In Czechia, the species has been recorded among leaf litter in floodplain forests and in peat bogs ( Buchar & Růžička 2002). In Great Britain, it is typically an upland species occurring beneath rocks on open mountains ( Harvey et al. 2002).

Global distribution. Eurasia after Helsdingen (2017), Mikhailov (2013), this article, Ono et al. (2009) and Namkung et al. (2009). See Fig. 37 View FIGURE 37 .

IECA

Biology Centre of the Academy of Sciences of the Czech Republic, Institute of Entomology

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Linyphiidae

Genus

Porrhomma

Loc

Porrhomma montanum Jackson, 1913

Růžička, Vlastimil 2018
2018
Loc

P. hakusanensis

Oi 1964
1964
Loc

Porrhomma montanum

Jackson 1913
1913
Loc

P. montanum

Jackson 1913
1913
Loc

P. hebescens

L. Koch 1879
1879
Loc

P. hebescens

L. Koch 1879
1879