Psechrus aluco, Bayer, 2012

Bayer, Steffen, 2012, The lace-sheet-weavers — a long story (Araneae: Psechridae: Psechrus), Zootaxa 3379 (1), pp. 1-170 : 33-34

publication ID 10.11646/zootaxa.3379.1.1


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scientific name

Psechrus aluco

sp. nov.

Psechrus aluco View in CoL sp. nov.

Figs 13a–c View FIGURES 13 , 87f View FIGURES 87 , 90f View FIGURES 90

Type material: Holotype ♀ ( SB 123 ), INDONESIA: Java, Jawa Barat Province: Cibodas, Gunung Gedeh Nature Reserve , 1450 m; S. Djojosudharmo leg. 06.XII.1986; Deeleman Coll. in RMNH.

Etymology. The specific name refers to the copulatory openings including the surrounding area, which are reminiscent of the eyes of the tawny owl ( Strix aluco Linnaeus ); term “aluco” in apposition.

Diagnosis (see also diagnosis for annulatus -group above). Females similar to P. annulatus in having rounded copulatory ducts (CD). Distinguished by the distinctly smaller CD and by the spermathecal heads (SH), which are located posteriorly at spermathecae ( Fig. 13b View FIGURES 13 ). Moreover, median septum (MS) protruding more strongly ( Fig. 13a View FIGURES 13 ).

Description. Male: unknown.

Female (Note: both legs IV missing):

Body and eye measurements. Carapace length 5.1, carapace width 3.4, anterior width of carapace 2.2, opisthosoma length 7.3, opisthosoma width 3.8. Eyes: AME 0.32, ALE 0.37, PME 0.37, PLE 0.36, AME–AME 0.22, AME–ALE 0.06, PME–PME 0.21, PME–PLE 0.33, AME–PME 0.43, ALE–PLE 0.37, clypeus height at AME 0.75, clypeus height at ALE 0.55.

Cheliceral furrow with three promarginal and four retromarginal teeth.

Measurements of palp and legs. Leg formula:—. Palp: 6.2 [2.1, 0.8, 1.2, 2.1]; Legs: I 34.3 [9.5, 1.9, 9.5, 8.6, 4.8], II 27.0 [7.7, 1.7, 7.2, 6.6, 3.8], III 18.7 [5.7, 1.3, 4.4, 4.7, 2.6].

Palpal claw with 14 teeth.

Spination. Palp: 131, 110, 1101, 1013; legs: femur I 556, II 546 III 545; patella I–III 000; tibia I–II 3038, III 3124; metatarsus I–III 3035.

Copulatory organ (see also diagnosis and general description of annulatus -group). MS very large in comparison to epigynal field (EF), posteriorly ca. 1.5x broader than between the two copulatory openings (CO) ( Fig. 13a View FIGURES 13 ). Slit sense organs and epigynal muscle sigilla outside EF. SH upon relatively short stalks ( Fig. 13b View FIGURES 13 ).

Note: It can not be excluded, that the dark parts at or in CO ( Figs 13a View FIGURES 13 , 87f View FIGURES 87 ) are mating plugs. I carefully tried to remove them, but they were very rigid. In order to avoid damage of epigynal structures I did not try harder. However, equally possible that these structures are part of the copulatory organ.

Colouration (see also description for annulatus -group and Psechrus ). Width of lateral bands medium-sized (ca. 1.3x diameter of PME) and not serrated.

Distribution. Indonesia [Java] ( Fig. 100 View FIGURE 100 ).













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