The lace-sheet-weavers — a long story (Araneae: Psechridae: Psechrus)
Author
Bayer, Steffen
text
Zootaxa
2012
2012-07-04
3379
1
1
170
https://biotaxa.org/Zootaxa/article/view/zootaxa.3379.1.1
journal article
20740
10.11646/zootaxa.3379.1.1
8ea1bd82-21db-4726-8d2a-be5866734ea0
11755334
6039832
Psechrus fuscai
sp. nov.
Figs 59a–c
,
82d
,
89e
,
92e
Type material.
Holotype
♀
(
SB 954
),
CHINA
:
Yunnan Province
:
Gongshan Co.
,
Bingzhongluo Township
,
trail between Niwaluo and Fuscai
,
N 28°01'24''
,
E 98°32'59''
,
2345 m
;
J.A. Miller
leg.
16.VIII.2006
; field no.
JM 06081601
, |
GLGS06-006
|;
CAS 9032230
.
Etymology.
The specific name refers to the
type
locality; term (name of village) in apposition.
Diagnosis
(see also diagnosis for
sinensis
-group above).
Female similar to
P. tingpingensis
in having median septum (MS), not longer than broad (
Fig. 59a
) but minimally broader than long, and twisted copulatory ducts (CD) with their initial sections running more or less transversally medially (
Fig. 59b
). Distinguished by the sack-like MS, the peculiar, flattened, glossy fields in the areas of copulatory openings (CO) (
Fig. 59a
,
89e
) and the clearly broader distal sections (in comparison with the proximal sections) of copulatory ducts (CD) (
Fig. 59b
).
FIGURES 59a–c.
Psechrus fuscai
sp. nov.
, ♀ holotype SB 954 from China, Yunnan Prov. a Epigyne, ventral view. b Vulva, dorsal view. c Schematic course of internal duct system. The asterisk indicates the peculiar, flattened, glossy field anterior to copulatory openings.
Description.
Male: unknown.
Female:
Body and eye measurements. Carapace length 10.0, carapace width 6.9, anterior width of carapace 4.3, opisthosoma length 12.5, opisthosoma width 6.6. Eyes: AME 0.46, ALE 0.51, PME 0.51, PLE 0.51, AME–AME 0.29, AME–ALE 0.09, PME–PME 0.42, PME–PLE 0.50, AME–PME 0.83, ALE–PLE 0.70, clypeus height at AME 1.22, clypeus height at ALE 1.18.
Cheliceral furrow with three promarginal and four retromarginal teeth.
Measurements of palp and legs. Leg formula: 1243. Palp: 12.5 [4.3, 1.8, 2.2, 4.2]; Legs: I 56.9 [16.3, 4.2, 15.5, 14.7, 6.2], II 45.6 [13.2, 3.8, 12.3, 11.4, 4.9], III 32.6 [9.9, 3.0, 8.1, 7.9, 3.7], IV 43.8 [12.7, 3.4, 11.5, 11.4, 4.8].
Palpal claw with 14 teeth.
Spination. Palp: 131, 110, 1101, 1014; legs: femur I–
II 516
,
III 435
,
IV 434
; patella I–IV 000; tibia I 3036,
II 3036
{3035}
III 2034
,
IV 2035
; metatarsus I–
IV 3035
.
Copulatory organ (see also diagnosis and general description of
sinensis
-group). Slit sense organs and epigynal muscle sigilla outside epigynal field (
Fig. 59a
). Spermathecal heads upon short stalks. Entire vulva irregularly shaped, right CD distinctly larger than left one (
Fig. 59b
).
Colouration (see also description for
sinensis
-group and
Psechrus
). Median bands on carapace hardly serrated (
Fig. 82d
). Lateral bands very narrow (at most 0.3 diameter of PME) and —if at all— slightly serrated (
Fig. 82d
). Light longitudinal line ventrally on opisthosoma constricted subdistally and medium sized to broad. If measured centrally on opisthosoma, its width is ca. 0.7 of one half of the cribellum. Distal part of longitudinal line slightly broader than main section.
Remarks:
At present it cannot be clarified if the irregular shape of the vulva is a species-specific character or if it should be regarded as malformation of this particular female. The latter seems more likely because in all other
Psechrus
species
, the female copulatory organ is bilaterally symmetrical.
Distribution.
China
(
Fig. 96
).