Porrhomma nekolai, Růžička, 2018

Růžička, Vlastimil, 2018, A review of the spider genus Porrhomma (Araneae, Linyphiidae), Zootaxa 4481 (1), pp. 1-75 : 43-45

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.5963996

persistent identifier

https://treatment.plazi.org/id/03C6A93B-FFFC-FFF9-FF7C-F89E82E33FB6

treatment provided by

Plazi

scientific name

Porrhomma nekolai
status

sp. nov.

Porrhomma nekolai View in CoL new species

Figs. 38A–F View FIGURE 38 , 39 View FIGURE 39 .

Male holotype, RUSSIA: Chukotka Autonomous Okrug, Christ Bay, env. of Egvekinot Town , SE slope, under stones, 15 Jul 1988, leg. Yu. M. Marusik ( ZMMU) . Paratypes: 1 ♀, with same data as for holotype ; 1 ♂ 3 ♀, Egvekinot Town , S slope, stony habitats in mountain tundra, 15 Jul 1988, leg. Yu. M. Marusik ; 1 ♀, Chukotka Autonomous Okrug, Amguema River, 67°03'N, 178°58'W, stony habitats, 22 Jul 1988, leg. Yu. M GoogleMaps . Marusik; 1 ♂ 1 ♀, Magadan Area, Duchka River , env. of Magadan, 13 Sep 1986, leg. Yu. M. Marusik ( ZMMU) . ♀, CANADA: Yukon Territory, Kluane Lake, Cultus Bay , 61°11'N, 138°20'W, 1650 m a.s.l., 10–23 Jul 1993, leg. Yu. M. Marusik ( CNC) GoogleMaps . Ƌ, USA, Iowa, Delaware County, Elk River East , ca 7 km WSW of Colesburg, 42.6284°N, 91.9209°W, 13 July 1998, leg. V. Růžička ( NMP, No. P 6A 6384). Ƌ, USA GoogleMaps , Iowa, Delaware County, Backbone Cave, July , 45 yds from end, u. wood ( AMNH) .

Etymology. The species is named after Jeffrey C. Nekola (University of New Mexico, Albuquerque, USA).

Diagnosis. A large group of species is characterised by embolus of middle length and S-shaped ascending parts of copulatory ducts: P. borgesi , P. cambridgei , P. convexum , P. errans , P. nekolai , P. oblitum , P. pygmaeum and P. rosenhaueri . P. nekolai new species can be distinguished from all these species by the following combination of characters: large species (CW> 0.70), eyes reduced (PME–PME 1.7–2.0), legs very long (Mt I/CW> 1.3).

Description. Male holotype (from Chukotka, Christ Bay, Egvekinot Town, 15 Jul 1988). Carapace yellowbrown, 1.10 mm long, 0.77 mm wide, eyes reduced, PME–PME = 1.7 ( Fig. 38A View FIGURE 38 ). Abdomen greyish-yellow. Fe I with one dorsal and one prolateral spine. Ti I with one prolateral spine, Ti I–II with one retrolateral spine. Mt I/CW = 1.43.

Embolus of middle length with a narrow velum. AP has the form of a bird head, it is slender, narrowed ( Fig. 38B View FIGURE 38 ).

Male paratype (from Iowa, Delaware County, Elk River East, 13 July 1998): A palp ( Fig. 39 View FIGURE 39 ).

Female paratype (together with holotype): carapace 0.78 mm wide, PME–PME = 1.8, Tm Mt I = 0.60, Mt I/ CW = 1.31. Ascending parts of the ducts are S-shaped. Spermathecae are formed behind the ascending part of the ducts ( Figs. 38C–F View FIGURE 38 ).

Variation. Ƌ ♀. Carapace 0.71–0.78 mm wide, PME–PME = 1.6–2.0, Tm Mt I = 0.58–0.61, Mt I/CW = 1.31– 1.47 (N = 4).

Comments. I recorded my first male under stones in Iowa, in 1998. I was accompanied by Jeffrey C. Nekola, an author of the concept of algific talus slopes as palaeorefugia ( Nekola 1999). In collections of the AMNH, I found the second male, collected in a cave, also in Iowa. Later, I obtained the material from Yukon Territory and Chukotka Peninsula, collected by Yuri M. Marusik during the research of spiders in stony habitats ( Marusik 2004). I decided to choose a complete pair from Chukotka for the description.

Ecology. Specimens from Chukotka and Yukon Territory were collected in stony habitats. In Iowa, one male was collected in algific talus slope developed in limestone and one in a cave. It is in coincidence with the knowledge that lithobiontic species colonise more cold habitats (such as freezing scree slopes and caves) in warmer parts of their distribution area ( Růžička 1990, 2011; Růžička et al. 2012).

Global distribution. North-East Asia; Nearctic: from Yukon Territory to Iowa. See Fig. 40 View FIGURE 40 .

ZMMU

Zoological Museum, Moscow Lomonosov State University

CNC

Canadian National Collection of Insects, Arachnids, and Nematodes

NMP

Natal Museum

AMNH

American Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Linyphiidae

Genus

Porrhomma

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