Psechrus steineri Bayer & Jäger, 2010

Bayer, Steffen, 2012, The lace-sheet-weavers — a long story (Araneae: Psechridae: Psechrus), Zootaxa 3379 (1), pp. 1-170 : 62-64

publication ID

https://doi.org/ 10.11646/zootaxa.3379.1.1

DOI

https://doi.org/10.5281/zenodo.5255916

persistent identifier

https://treatment.plazi.org/id/D0272654-FFBD-587C-FF20-2AD9FDD6450D

treatment provided by

Felipe

scientific name

Psechrus steineri Bayer & Jäger, 2010
status

 

Psechrus steineri Bayer & Jäger, 2010 View in CoL

Figs 30a–g View FIGURES 30 , 85f View FIGURES 85 , 88f View FIGURES 88 , 91f View FIGURES 91

Psechrus steineri Bayer and Jäger 2010: 59 View in CoL , figs 1–9, 54, 57 ( Description   GoogleMaps of ♂ and ♀, illustration of ♂ and ♀). [Holotype ♀ ( SB 65 ) from LAOS: Khammouan Province: Ban Nong Ping, Xe Bangfai cave system, Tham Pha Leusi, N 17°22'23.4'', E 105°50'28.4'', ca. 300 m, inside cave; H. Steiner leg. 15.II.2007; SMF; Paratype: 1 ♂ ( SB 64 ), same data as for holotype; SMF; all type material examined].

Additional material examined. LAOS: Khammouan Province: Ban Nong Ping, Xe Bangfai cave system, Tham Pha Leusi , N 17°22'23.4'', E 105°50'28.4'', ca. 300 m, inside cave; H. Steiner leg. 15. II.2007; 1 juv. ( SB 66 ), SMF GoogleMaps .

Revised diagnosis (see also diagnosis for ancoralis -group above). Males similar to P. khammouan in having bulky tegulum (T) and narrow conductor (C). Distinguished by the shorter embolus (E) and C, the even more bulky and larger T ( Figs 30a–c View FIGURES 30 ), the differently shaped embolus base (EB) and the median ridge distally on conductor ( Fig. 30b View FIGURES 30 ). Females similar to P. khammouan in having median septum (MS) with lateral margins diverging ( Figs 29e View FIGURES 29 , 30e View FIGURES 30 ), initial sections of copulatory ducts (CD) running transversally and spermathecal heads clearly separated from spermathecae ( Figs 29b View FIGURES 29 , 30f View FIGURES 30 ). Distinguished by the strongly diverging margins of MS causing anterior sections running almost parallel with epigastric furrow ( Fig. 30e View FIGURES 30 ). Moreover, CD distinctly shorter ( Fig. 30f View FIGURES 30 ).

Description. Male:

Body and eye measurements. Carapace length 8.4, carapace width 5.8, anterior width of carapace 3.1, opisthosoma length 9.6, opisthosoma width 3.8. Eyes: AME 0.42, ALE 0.48, PME 0.52, PLE 0.49, AME–AME 0.22, AME–ALE 0.06, PME–PME 0.35, PME–PLE 0.39, AME–PME 0.62, ALE–PLE 0.43, clypeus height at AME 1.04, clypeus height at ALE 0.95.

Cheliceral furrow with three promarginal and four retromarginal teeth.

Measurements of palp and legs. Leg formula: 1423. Palp: 9.8 [3.6, 1.8, 1.6, 2.8]; Legs: I 65.9 [16.9, 3.9, 18.5, 19.5, 7.1], II 49.0 [13.0, 3.6, 13.5, 13.2, 5.7], III 33.9 [9.8, 2.8, 8.3, 9.1, 3.9], IV 50.6 [13.5, 3.0, 13.0, 14.7, 6.4].

Spination. Palp: 131, 010, 0100; legs: femur I 666, II 566, III 656{555}, IV 565; patella I–IV 000; tibia I 3037{3038}, II 3038, III–IV 3035; metatarsus I–III 3035, IV 3034.

Palpal femur not very slim, without modification ( Fig. 30d View FIGURES 30 ).

Copulatory organ (see also diagnosis and general description for ancoralis -group). Conductor (C) distally folded ventrad ( Figs 30b–c View FIGURES 30 ). Tegulum with rounded “corner” ( Fig. 30b View FIGURES 30 ) close to the arising point of E. Palpal tibia ( Figs 30a–c View FIGURES 30 ) relatively short and bulky ( Figs 30a–c View FIGURES 30 ).

Female:

Body and eye measurements. Carapace length 8.2, carapace width 5.5, anterior width of carapace 3.4, opisthosoma length 10.2, opisthosoma width 4.6. Eyes: AME 0.47, ALE 0.50, PME 0.50, PLE 0.49, AME–AME 0.18, AME–ALE 0.02, PME–PME 0.29, PME–PLE 0.48, AME–PME 0.65, ALE–PLE 0.50, clypeus height at AME 1.19, clypeus height at ALE 1.04.

Cheliceral furrow with three promarginal and four (five, right) retromarginal teeth.

Measurements of palp and legs. Leg formula: 1423. Palp: 9.5 [3.3, 1.5, 1.9, 2.8]; Legs: I 50.1 [13.9, 3.4, 14.2, 13.0, 5.6], II 40.0 [11.4, 3.2, 10.8, 10.2, 4.4], III 27.6 [8.3, 2.3, 6.8, 7.1, 5.1], IV 41.1 [11.8, 2.8, 10.6, 10.8, 5.1].

Palpal claw with 13 teeth.

Spination. Palp: 131{141}, 110, 1101, 1014; legs: femur I–II 556, III 555, IV 554; patella I–IV 000; tibia I–II 3038, III 3134(dorsal one small), IV 3135(dorsal one small); metatarsus I–IV 3035.

Copulatory organ (see also diagnosis and general description of ancoralis -group). Epigynal muscle sigilla and slit sense organs outside epigynal field ( Fig. 30e View FIGURES 30 ). Spermathecal heads located anterio-medially. Spermatheca irregularly shaped ( Fig. 30f View FIGURES 30 , 91f View FIGURES 91 ).

Colouration of male and female (see also description for ancoralis -group and Psechrus ). Median bands on carapace not serrated. Lateral bands extremely narrow or not even recognisable (at most 1/4 diameter of PME), not serrated. Light longitudinal line ventrally on opisthosoma continuous and narrow. If measured centrally on opisthosoma, its width is ca. 1/2 the width of one half of the cribellum.

Distribution. Laos ( Fig. 98 View FIGURE 98 ).

SMF

Forschungsinstitut und Natur-Museum Senckenberg

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Psechridae

Genus

Psechrus

Loc

Psechrus steineri Bayer & Jäger, 2010

Bayer, Steffen 2012
2012
Loc

Psechrus steineri Bayer and Jäger 2010: 59

Bayer, S. & Jager, P. 2010: 59
2010
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