A survey of the Sumatran Ctenidae (Araneae). 1. Two new Acantheis species
Author
Fomichev, Alexander A.
Altai State University, Lenina Pr., 61, Barnaul, RF- 656049, Russia & Tomsk State University, Lenina Pr., 36, Tomsk, RF- 634050, Russia
Author
Omelko, Mikhail M.
Federal Scientific Center of East Asia Terrestrial Biodiversity, Far Eastern Branch, Russian Academy of Sciences, Vladivostok 690022, Russia
Author
Marusik, Yuri M.
Altai State University, Lenina Pr., 61, Barnaul, RF- 656049, Russia & Department of Zoology & Entomology, University of the Free State, Bloemfontein 9300, South Africa & Institute for Biological Problems of the North, Magadan 685000, Russia
text
Zootaxa
2023
2023-10-09
5353
2
117
130
http://dx.doi.org/10.11646/zootaxa.5353.2.2
journal article
10.11646/zootaxa.5353.2.2
1175-5326
8427062
7A24DCBF-BC93-4B25-BB8A-DEAE75167DB4
Acantheis dimidiatus
(
Thorell, 1890
)
Figs 36–48
Acanthoctenus dimidiatus
Thorell, 1890: 134
(♁).
Acantheis dimidiatus
—
Simon 1897: 117
.
Material examined.
1♁ (
holotype
) (
MSNG
),
INDONESIA
:
Sumatra
Island:
Singalong, O
. Beccari. Examined by photo
.
Diagnosis.
The species is similar to
A. laetus
from
Kalimantan
and to
A. sergeimishenini
sp. n.
and
A. andreimishenini
sp. n.
from
Sumatra
in having the slender embolus (
Em
), the medially located tegular apophysis (
TA
) and the elongated cymbial tip. The male of
A. dimidiatus
differs from that of
A. laetus
by by the strongly curved embolus (
vs
. smoothly rounded, cf.
Fig 43
and
Lehtinen 1967
: fig. 410).The male of
A. dimidiatus
can be distinguished from that of
A. sergeimishenini
sp. n.
by the non-bifurcated retrolateral tibial apophsis (
RTA
) (
vs
. bifurcated, cf.
Figs 41
and
15
), the triangular tegular apophysis (
vs
. comma-shaped, cf.
Figs 43
and
23
), and the ventral embolic branch twice thinner than dorsal one (
vs
. ventral embolic branch twice wider than dorsal one, cf.
Figs 41
and
30
). From the males of
A. andreimishenini
sp. n.
those of
A. dimidiatus
differs by the dorsal surface of opisthosoma with a thin stripe reaching spinnerets (
vs
. wide cardiac mark reaching middle part of opisthosoma, cf.
Figs 36
and
3
), the median band on the carapace as wide as distance between PME (
vs
. as wide as the distance between PLE), the triangular tegular apophysis (
TA
) (
vs
. circular, cf.
Figs 43
and
27
), and the ventral embolic branch twice thinner than dorsal one (
vs
. dorsal and ventral embolic branches equal in size, cf.
Figs 41
and
31
). For a complete list of the differences between the males of
A. dimidiatus
,
A. sergeimishenini
sp. n.
and
A. andreimeshenini
sp. n.
see
Table 7
.
Description.
Male palp as shown in
Figs 37–43
. Tibia ca. 4.6 longer than wide, 4 very long spines, longest ca. 0.7 of tibia length. Retrolateral tibial apophysis small, non-bifurcated. Cymbial tip about 0.42 of its length, slightly shorter than bulb. Sperm duct clearly visible only in retrolateral view. Tegular apophysis triangular. Embolus strongly curved. Ventral branch of embolus twice thinner than dorsal one.
Female. Unknown.
Distribution.
Only known from the
type
locality (
Figs 46–48
).