Three new species of the oonopid spider genus Ischnothyreus (Araneae: Oonopidae) from Tioman Island (Malaysia)
Author
Kranz-Baltensperger, Yvonne
text
Zootaxa
2012
2012-01-16
3161
1
37
47
https://biotaxa.org/Zootaxa/article/view/zootaxa.3161.1.3
journal article
45649
10.11646/zootaxa.3161.1.3
60abb5f0-b723-4e84-885c-4676bec0d26f
1175-5326
214142
Ischnothyreus namo
sp. nov.
(
Figs 5–6
,
7
)
Type
material.
Holotype
:
male
(
PBI_OON 00012688
),
MALAYSIA
:
Tioman
Island
(=
Pulau
Tioman
),
Gunung Kajang
,
900–1000m
,
2°46’0”N
,
104°09’4”E
,
29.IV.2005
, leg.
A. Schulz
,
MHNG
.
Paratypes
:
1 female
(
PBI_OON 00032382
), collected with holotype,
MHNG
.
1 female
(
PBI_OON 00015670
),
Tioman
Island
, westside,
2 km
SE of
Kampung Genting
,
100m
,
2°47’N
,
104°8’E
,
27.VI.2001
, leg.
A. Schulz
&
K. Vock
,
MHNG
.
1 male
(
PBI_OON 00012604
),
Tioman
Island
,
Gunung Kajang
,
500–600m
,
2°46’0”N
,
104°09’4”E
,
25.IV.2005
, leg.
A.Schulz
,
MHNG
.
2 females
(
PBI_OON 00012646
), same data as holotype, but
27.IV.2005
,
MHNG
.
1 female
(
PBI_OON 00032352
),
Tioman
Island
, path from
Kampung Paya
to
Gunung Kajang
,
200–600m
,
02°46’84”N
,
104°07’63”E
,
6.–7.VI.2007
. leg.
A. Schulz
,
MHNG
.
1 female
(
PBI_OON 00032353
),
Tioman
Island
, westside of
Gunung Kajang
,
2 km
E of
Kampung Genting
,
400m
,
2°47’N
,
104°8’E
,
2.VII.2001
, leg.
A. Schulz
&
K. Vock
,
MHNG
.
1 female
(
PBI_OON 00015672
), same data as PBI_OON 0 0 0 32353, but
300–400m
,
3.VII.2001
,
MHNG
.
FIGURE 5.
Ischnothyreus namo
sp. nov.
male. A, habitus, dorsal view; B, habitus, ventral view; C, carapace, frontal view; D, left chelicera, anterior view; E, right palp, retrolateral view; F, right palp, prolateral view. Stp, strong tooth-like projection; vp, ventral projection; r, ribbed; l, lobe; mo, membranous outgrowth; e, embolus. Scale bars A, B = 0.5 mm; C = 0.25 mm; D, E, F = 0.1 mm.
FIGURE 6.
Ischnothyreus namo
sp. nov.
female. A, habitus, dorsal view; B, habitus, ventral view; C, abdomen, ventral view; D, genital area, ventral view; E, genital area, dorsal view. Wt, winding tube; a, apodemes; tr, transverse ridge. Scale bars A, B = 0.5 mm; C = 0.25 mm; D, E = 0.1 mm.
Etymology.
The specific name is an arbitrary combination of letters.
Diagnosis.
The male of
I. namo
can be distinguished from males of
I. tioman
and
I. tekek
by the lack of the cheliceral apophyses and the simple palp.
I. namo
resembles
I. aculeatus
(
Simon 1893
)
from Sumatra and the
Philippines
but can be distinguished from this species by the abdominal scuta, which cover almost the whole abdomen (
Fig. 5
A–F), while they are short in
I. aculeatus
. The female of
I. namo
shows a very distinct epigastric conformation with strongly sclerotized apodemes and a strongly winding tube (
Fig. 6
C–E).
Description.
Male. Total length
1.49 mm
.
Carapace
: slightly elevated in lateral view, fovea present, lateral margin rebordered.
Eyes
: ALE separated by less than their radius.
Mouthparts
: Chelicerae slightly divergent, base of fang slightly enlarged, ridges (r) and three trichobothria-like setae present on the anterior face of the paturon (arrows) (
Fig. 5
D). Anterior margin of labium indented at middle. Anteromedian tip of endites with one strong, tooth-like projection (stp) (
Fig. 5
B).
Abdomen
: Scutum extending far dorsal of pedicel. Dorsal scutum covering more than 3/4 of abdomen, more than 1/2 to most of abdomen width, not fused to epigastric scutum.
Legs
: spine formula: femora: I p0-1-1; II p0-0-1; tibiae: I, II p2-1-1; r2-1-1; metatarsi: I, II p1-1-0; r1-1-0. Trichobothria not examined.
Genitalia
: Trochanter with small ventral projection (vp) (
Fig. 5
B); tibia with three trichobothria, distal part of bulb simple, with small prolateral membrane (mo) and retrolateral lobe (l), embolus (e) thin and short, directed backwards (
Fig. 5
E–F).
FIGURE 7.
A. Overview map of Southeast Asia. B. Detailed map of
Tioman
Island with localities of
Ischnothyreus
species treated in the present study.
Female: Total length
1.39 mm
. As in male except as noted.
Carapace
: without any pattern, broadly oval in dorsal view, pars cephalica strongly elevated in lateral view, fovea absent.
Eyes
: ALE separated from edge of carapace by less than their radius. ALE touching.
Mouthparts
: Labium not fused to sternum, anterior margin not indented at middle. Anteromedian tip of endites unmodified. Palpal femur with four spines, palpal tibia with three trichobothria.
Abdomen
: Pedicel scutum not extending far dorsal of pedicel. Dorsal scutum covering less than 1/2 of abdomen, between 1/4 and 1/2 abdomen width. Epigastric scutum slightly protruding. Postepigastric scutum widely hexagonal, only around epigastric furrow, not fused to epigastric scutum, with short posteriorly directed lateral apodemes. Dense patch of setae anterior to spinnerets present.
Legs
: spine formula: femora: I p0-1-1; r0-1-0; II p0- 0-1; r0-0-1; tibiae: I, II p2-1-1; r2-1-1; metatarsi: I, II p1-1-0; r1-1-0.
Genitalia
: The posterior margin of the epigastric scutum is lined with numerous needle-like setae. Postepigastric scutum with strongly sclerotized apodemes (a), connected by transverse ridge (tr). Dark, winding tube running posteriorly (wt) (
Fig. 6
D–F).
Distribution.
Tioman
Island.