SAC SPIDERS OF BANGLADESH-II: GENERA CASTIANElRA KEYSERLING, SPHINGIUS THORELL AND TRACHELAS KOCH (ARANEAE: CLUBIONIDAE)
Author
Biswas
Author
Raychaudhuri
text
Records of the Zoological Survey of India
2000
98
2
131
139
journal article
10.5281/zenodo.556082
b0c3c201-4426-4512-8505-cb0a70e6ca65
556082
3.
Trachelas devi
n. sp.
(
Figs. 15-21
)
General:
Cephalothorax brown; legs yellow; abdomen black. Total body length 3.00 mm. Carapace length
1.10 mm
. Carapace width 1.00 mm; abdominal length
1.90 mm
; abdominal width
1.20 mm
. Legs as in Table-I.
Cephalothorax
: Longer than wide, anteriorly narrowing, posteriorly overlapped by abdomen; cephalic region raised; cervical furrows weakly distinct; posteromedially with a fovea; radial furrows deeply distinct. Eyes pearly-white, based with black band, unequal in size, anterolaterals largest; anterior row of eyes strongly recurved and posterior row nearly straight; anteromedian eyes close while posteromedians distantly placed; laterals closely placed; ocular quad longer than wide. Chelicerae brown, strong, both inner and outer margins with 2 teeth (
Figs. 17
). Maxillae and labium brown, maxillae broad, longer than wide (
Figs. 18
); labium broad, as long as wide (
Figs. 18
); both maxillae and labium anteriorly scopulate. Sternum dark brown, broad, nearly heartshaped (
Figs. 19
). Legs long and slender, each of tibia and metatarsi I and 11 with 3 ventral spines; tarsi with 2 claws; leg formula 4132 and the measurements (in mm) as in Table-I
Abdomen:
Oval, dorsum submarginally with serially arranged black patches leaving the white longitudinal mid-dorsal area (
Figs. 15
) Epigyne and internal genitalia as in figs. 20 and 21.
.
Table-I
: Measurments (in mm) of different parts of legs of
Trachelas devi
n. sp.
| Leg |
Femur |
Patella |
Tibia |
Metatarsi |
Tarsus |
Total |
| I |
0.7/0.7 |
0.2/0.2 |
0.3/0.3 |
0.9/0.9 |
0.3/0.3 |
3.0/3.0 |
| II |
0.6/0.6 |
0.3/0.3 |
0.5/0.5 |
1.011.0 |
0.4/0.4 |
1.18/1.18 |
| III |
0.5/0.5 |
0.8/0.8 |
0.7/0.7 |
0.2/0.2 |
0.6/0.6 |
2.8/2.8 |
| IV |
0.7/0.7 |
. 0.3/0.3 |
1.1/1.1 |
1.1/1.1 |
0.7/0.7 |
3.9/3.9 |
Male:
Unknown.
Holotype
:
Female
in spirit.
Types
are at present in the Depa~tment of Zoology, Government
P.
C.
College
, Bagerhat and will be deposited to the Museum of the Department of Zoology, University of
Dhaka
,
Bangladesh
, in due course of time.
Figs
, 1-7:
Castianeira zetes
Simon
- Fig. I: Whole body (Dorsal view); Fig. 2: Chelicera; Fig. 3: Maxillae and Labium; Fig. 4: Sternum; Fig. 5: Epigynum; Fig. 6: Internal genitalia; Fig. 7: Male palp (retrolateral view)
Figs. 8
-14:
Sphingius barkudaensis
Gravely
- Fig. 8: Whole body (Dorsal view); Fig. 9: Chelicera; Fig. 10: Maxillae and Labium; Fig. 11: Sternum; fig. 12: Epigynum; Fig. 13: Internal genitalia; Fig. 14: Male palp (lateral view)
Figs. 15-21
:
Trachelas
devi
n. sp.
- Fig. 15: Whole body (Dorsal view); Fig. 16: Clypeus showing chelicerae and frontal eyes; Fig. 17: Chelicera: Fig. 18: Maxillae and Labium; Fig. 19: Sternum; Fig. 20: Epigynum; Fig. 21: Internal genitalia
Etymology: The species
is named after
the
famous Philosopher Dr.
G.
C.
Dev of
Dhaka University
, Bangladesh.
Type-locality:
BANGLADESH: Dhaka, date
24.ii.
I992, Coil. Biswas.
Diagnosis: The Indian
Trachelas
species (
Majumder &
Tikader,
1991
)
do not
seem
to be
related
to the
present species
T. devi
n. sp.
because
the
latter is
with abdomen broad at
anterior 1 1/3rd region, without
any
sigilla,
cephalic region not
constricted, contiguous anteromedian
and
lateral
eyes and
typical epigynum.
These
sufficiently justify
the erection
of
the
new species. Abdominal
shape
of
the
present species even
though
may
be
related
to the
T. taiwanicus (Hayashi &
Yoshida
, 1993
)
but stands
distinct because of
the
characters indicated above.
The
species
even
show
too many
structural differences, though it
has
a similarity in
the
general appearance
with that
of
T. japonicus
(
Shinkai & Takano, 1984
)
.
Therefore,
the species
is described as new
to
science.