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 clavis
sp. nov.
Figs 66a–e
,
67a–j
,
86f
,
89h
,
92h
Psechrus torvus
—
Kayashima 1962: 9
, figs 1–4 (Description of
♀
, illustration of
♀
, misidentified).
Psechrus
sp.
—
Yoshida 1978: 24
, fig. 2 (Illustration of
♂
).
Psechrus sinensis
—
Chen 1996: 134
(Listed as fauna element of
Taiwan
, misidentified).
Chen 1999: 426
, 427, 431, misidentified.
Chen 2001: 243–244
, figs integrated in the text (Photos of dorsal and ventral habitus of
♂
, misidentified).
Psechrus taiwanensis
—
Ono 2009: 140
, figs 2.2.24.1–3 (Description of
♀
, illustration of
♀
, misidentified).
Yoshida 2009: 7
, figs 1–7 (Description of
♂
and
♀
, illustration of
♂
and
♀
, misidentified).
Type material.
Holotype
♀
(
SB 1021
),
TAIWAN
:
Taichung
county:
Dong-Shi
(Dongshih),
N 24°15'04''
,
E 120°51'03''
, ca.
450 m
, secondary forest;
R.C. Cheng
leg.
XI.2010
;
SMF
.
Paratypes
(
2 ♂♂
,
7 ♀♀
, 4 s.a.
♀♀
):
1
♀
(
SB 276
),
3 s.a.
♀♀
(
SB 1018
,
1024
,
1027
)
,
with same data as for holotype;
SMF
;
1 s.a
.
♀
(
SB 276
)
,
TAIWAN
:
Taichung
county:
Wushihkeng
,
N 24°16'30''
,
E 120°56'56''
,
950–1000 m
, mixture of broadleaf forest and plantation forest, edge of a trail;
R.C. Cheng
leg.
IX.2009
;
SMF
;
1
♀
(
SB 614
)
,
TAIWAN
:
Taoyuan county
:
Ssuleng
,
N 24°37'
,
E 121°23'
, ca.
1300 m
, mountainous forest, bush on rocky surface (roadside);
H. Ono
leg. 030.
X.2003
; NSMT 8507
;
1
♂
(
SB 616
)
,
1
♀
(
SB 617
)
,
TAIWAN
:
Nantou county
:
Penpuchi
, ca.
N 24°00'
,
E 121°05'
, ca.
800 m
;
H. Yoshida
leg.
02.
IV
.1979
; NSMT 8379
;
1
♂
(
SB 1008
)
,
1
♀
(
SB 1010
)
,
TAIWAN
:
Nantou county
:
Yuchih (Yu-Chi) township
, Lian-Hua-Chih,
N 23°55'07''
,
E 120°53'02''
, ca.
700 m
, secondary forest;
R.C. Cheng
leg.
II
.2011
;
SMF
;
2
♀♀
(
SB 793
,
879
)
,
TAIWAN
:
Nantou county
:
Chitou Forest Recreation Area
, ca.
N 23°42'
,
E 120°48'
, ca.
1600 m
;
J. Haupt
leg.
08.
IV
.2004
; ZMB (
SB793
)
;
H. Yoshida
leg.
20.VII.1977
; YPM (
SB 879
, at N 23°41')
;
1
♀
(
SB 831
)
,
TAIWAN
:
Chiayi county
:
Alishan
;
H. Yoshida
leg.
11.VII.1977
; NSMT 8380
.
Additional material examined
(
1 ♂
,
4 ♀♀
, 6 s.a.
♂♂
,
1 p.
s.a.
♂
,
1 p.
s.a.
♀
, 2 juvs).
TAIWAN
:
Taipei
City
:
Yangmingshan
;
H. Yoshida
leg.
07.
IV
.1979
;
2 ♀♀
(
SB 877–878
), YPM.
Miaoli county
:
Kuan-Wu,
N 24°24'20''
,
E 120°58'32''
, ca.
1200 m
, secondary forest
;
R.C. Cheng
leg.
XI.2009
; 1 s.a.
♂
(
SB 1011
),
1 p.
s.a.
♂
(
SB 1012
),
SMF
.
Taichung
county:
Wushihkeng
,
N 24°16'30''
,
E 120°56'56''
,
950–1000 m
, mixture of broadleaf forest and plantation forest, edge of a trail
;
R.C. Cheng
leg.
IX.2009
; 2 juvs (
SB 277–278
),
SMF
. Dong-Shi (Dongshih),
N 24°15'04''
,
E 120°51'03''
, ca.
450 m
, secondary forest;
R.C. Cheng
leg.
XI.2010
; 4 s.a.
♂♂
(
SB 1019
,
1022–1023
,
1026
),
1 p.
s.a.
♀
(
SB 1020
),
SMF
.
Nantou county
:
Tsuifeng
, ca.
N 24°06'
,
E 121°12'
, ca.
2200 m
;
H. Yoshida
leg.
23.VII.1977
;
1 ♂
(
SB 876
), YPM.
Yuchih (Yu-Chi) township
, Lian-Hua-Chih,
N 23°55'07''
,
E 120°53'02''
, ca.
700 m
, secondary forest
;
R.C. Cheng
leg.
II
.2011
;
1 s.a.
♂
(
SB 1009
),
SMF
. Meichi;
H. Yoshida
leg.
30.
III
.1979
;
1 ♀
(
SB 619
), NSMT 8377.
Chiayi county
:
Alishan
;
H. Yoshida
leg.
11.VII.1977
;
1 ♀
(
SB 880
), YPM
.
Etymology.
The specific name refers to the similarity of the epigynal median septum of the female
type
specimens with a keyhole (Latin “clavis” means “key, lock, keyhole”); term (noun) in apposition.
Diagnosis
(see also diagnosis for
sinensis
-group above).
Males with relatively simple embolus base (EB), without apophyses or special structures, except a few ridges (
Fig. 66c
). Tegulum (T) protruding baso-retrolaterally (
Fig. 66b
). Palpal femur only with very indistinct ventral modification (
Fig. 66d
), almost not recognisable as such. Epigyne of females similar to
P. senoculatus
in having elongated median septum (MS) broadest in anterior half. Distinguished by the shorter MS (at most 1.5x longer than broad) (
Fig.67a
). Vulva with initial section of copulatory duct (CD) already included in kidney-shaped bulbous section (
Fig. 67b
). The latter clearly longer than broad and not in direct contact with the spermathecae.
Description.
Male:
Body and eye measurements. Carapace length 6.3–10.2, carapace width 4.3–7.0, anterior width of carapace 2.7–3.9, opisthosoma length 7.7–11.6, opisthosoma width 4.6–6.1. Eyes: AME 0.31–0.41, ALE 0.38–0.49, PME 0.39–0.51, PLE 0.38–0.51, AME–AME 0.18–0.27, AME–ALE 0.08–0.11, PME–PME 0.28–0.37, PME–PLE 0.39–0.44, AME–PME 0.60–0.76, ALE–PLE 0.43–0.57, clypeus height at AME 0.87–1.20, clypeus height at ALE 0.79–1.15.
Cheliceral furrow with three promarginal and four retromarginal teeth.
Measurements of palp and legs. Leg formula: 1243. Palp: 7.4–11.5 [2.7–3.9, 1.2–1.9, 1.1–1.8, 2.4–3.9]; Legs: I 49.2–70.0 [12.7–17.8, 3.0–4.7, 14.1–19.3, 13.5–19.9, 5.9–8.3], II 38.9–52.8 [10.6–14.6, 2.7–4.2, 10.4–13.5, 10.4–14.5, 4.8–6.0], III 27.7–37.6 [8.0–10.7, 2.2–3.3, 6.8–9.4, 7.2–9.8, 3.5–4.4], IV 38.8–52.6 [10.4–14.7, 2.4–3.6, 10.0–13.8, 11.0–14.3, 5.0–6.2].
Spination. Palp: 131 (121), 110(prolateral one small), 1101(all spines small); legs: femur I 546 (546,525), II 546 (546,526) III 545 (545,525,565), IV 544 (544,524); patella I–IV 000; tibia I–II 3038,
III 2034
(2034,3034), IV 3036 (3036,3034); metatarsus I–III 3035, IV 3035 (3035,3036).
Copulatory organ (see also diagnosis and general description for
sinensis
-group). Embolus slightly serrated ventrally (
Fig. 66b
). Conductor apically with folding and dorsally with small spines (
Figs 66a–b
). Sperm duct with transversal section in retrolateral half of T and with distinct loop in prolateral half. Palpal tibia short (
Figs 66a–c
).
FIGURES 66a–e.
Psechrus clavis
sp. nov.
a–d ♂ paratype SB 616 from Taiwan, Nantou County. e s.a. ♂ SB 1026 from Taiwan, Taichung County. a–c ♂ palp (a prolateral, b ventral, c retrolateral view). d ♂ left palpal femur, retrolateral view. e Left cheliceral furrow, orthogonal view.
Female
(Measurements of
holotype
first, those of
paratype
females as range in parentheses).
Body and eye measurements. Carapace length 8.2 (7.2–8.5), carapace width 5.7 (4.7–6.0), anterior width of carapace 3.8 (3.3–3.9), opisthosoma length 9.7 (7.3–11.6), opisthosoma width 3.9 (3.6–6.8). Eyes: AME 0.41 (0.37–0.44), ALE 0.50 (0.46–0.51), PME 0.51 (0.47–0.51), PLE 0.49 (0.46–0.50), AME–AME 0.22 (0.17–0.24), AME–ALE 0.06 (0.05–0.06), PME–PME 0.31 (0.29–0.36), PME–PLE 0.43 (0.40–0.48), AME–PME 0.66 (0.63–0.73), ALE–PLE 0.48 (0.51–0.61), clypeus height at AME 1.03 (0.91–1.05), clypeus height at ALE 1.03 (0.85–1.03).
Cheliceral furrow with three promarginal and four retromarginal teeth.
Measurements of palp and legs. Leg formula: 1243 (1243,1423). Palp: 9.4 (9.0–10.2) [3.3 (3.1–3.3), 1.3 (1.2–1.6), 1.7 (1.7–1.9), 3.1 (3.0–3.4)]; Legs: I 48.3 (42.9–48.7) [13.2 (11.7–13.2), 3.6 (3.0–3.6), 13.8 (11.9–13.7), 12.3 (11.1–12.7), 5.4 (5.2–5.7)], II 38.7 (32.6–39.0) [11.3 (9.4–10.8), 3.3 (2.7–3.3), 10.3 (9.2–10.5), 9.4 (8.2–9.8), 4.4 (3.1–4.6)], III 27.2 (24.3–28.1) [8.3 (7.3–8.3), 2.4 (2.2–2.6), 6.6 (6.0–6.9), 6.7 (5.9–7.1), 3.2 (2.9–3.2)], IV 38.3 (34.3–38.9) [11.4 (9.9–11.2), 2.8 (2.3–2.9), 10.1 (9.1–10.2), 9.5 (8.6–9.9), 4.5 (4.3–4.7)].
Palpal claw with 15 (13–15) teeth.
FIGURES 67a–j.
Psechrus clavis
sp. nov.
, ♀ adult and primordial copulatory organ. a–c ♀ holotype SB 1021, d–e s.a. ♀ paratype SB276, both from Taiwan, Taichung County. g–h ♀ paratype SB 793, i–j ♀ SB 619, both from Taiwan, Nantou County. f ♀ SB 877 from Taiwan, Taipei County. a, h, j Epigyne, ventral view. b, f–g, i Vulva, dorsal view. c Schematic course of internal duct system. d Pre-epigyne, ventral view. e Pre-vulva, dorsal view.
Spination. Palp: 131 (131), 110 (110), 1101 (1101), 1014 (1014); legs (—except for patella— variable, only most common states noted): femur I 546 (536,526),
II 546
(546,436,636)
III 545
(555,536,445),
IV 544
(554,544,434); patella I–II, IV 000 (000), III 000{100} (000); tibia I 3038 (3038),
II 3038
(3038,3037),
III 2036
{2024} (2036,2035,2026),
IV 2036
(3036,2036,3027); metatarsus I 3035 (3035),
II 3035
(3035,3037),
III 3035
(3035),
IV 3035
(3035,3025,3036).
Copulatory organ (see also diagnosis and general description of
sinensis
-group). Margins of MS at least slightly S-shaped. Slit sense organs outside and epigynal muscle sigilla within epigynal field (
Fig. 67a
). Bulbous parts of CD (
Figs 67b,i
) laterally convex, medially concav, separated from receptacula by a gap.
Primordial copulatory organ. Pre-epigyne: Similar to
P. senoculatus
in shape of pre-MS. The latter (at least slightly) longer than broad and with (almost) parallel margins (
Fig. 67d
). Distinguished by the shorter pre-MS whose margins anteriorly bordered by transversal edges (
Fig. 67d
).
Pre-vulva: Similar to
P. senoculatus
.
Distinguished by the shorter pre-CD (
Fig. 67e
).
Colouration of male and female (see also description for
sinensis
-group and
Psechrus
). Median bands on carapace slightly serrated. Lateral bands very narrow (at most 0.7 diameter of PME) and not serrated. Light longitudinal line ventrally on opisthosoma may be broken subdistally or strongly constricted subdistally and broad. If measured centrally on opisthosoma, its width is ca. 0.7–1.2 times the width of one half of the cribellum. Distal part (patch) mostly broader than main section.
Variation of copulatory organs.
In males T may be a bit shorter and the spines on C may be more indistinct (not illustrated) than in
SB 616
(
Figs 66a–c
). In females MS may be slightly narrower (
Fig. 67h
) or broader (
Fig. 67j
,
89h
) than in
holotype
. Posterior part of MS straight in
holotype
(
Fig. 67a
) and very slightly concave medially in
SB 793
from Chitou,
Nantou County
(
Fig. 67h
). In vulvae the shapes of bulbous section of CD may be broader (
Fig. 67f
) or narrower (
Fig. 67i
) than in
holotype
(
Fig. 67b
) or in
SB 793
from Chitou (
Fig.
67g
). Spermathecal head in some specimens with additional, small outgrowth (
Fig.
67g
).
Remarks:
Ono (2009)
and
Yoshida (2009)
regarded this species as
P. taiwanensis
. However, a comparison of the females of this new species examined in the present study with the female
P. taiwanensis
holotype
, showed that their copulatory organs are clearly different.
Distribution.
Taiwan
(
Fig. 97
).