Studies in Liocranidae (Araneae): redescriptions and transfers in Apostenus Westring and Brachyanillus Simon, as well as description of a new genus
Author
Bosselaers, Jan
text
Zootaxa
2009
2141
37
55
journal article
10.5281/zenodo.188586
ddfbe6a3-4ba0-477c-82ba-0190603b6c15
1175-5326
188586
Agraecina rutilia
(Simon, 1897)
new combination
Figs. 3 A, B
; 2 E; 8 C.
Apostenus rutilius
Simon, 1897b
: 498
.
Type material.
Holotype
female, "
Ap. rutilius
E.S. Freetown
",
Sierra Leone
[
MNHN
8149]
.
Other material examined.
1 ♀,
Sierra Leone
, Freetown, Mt. Aureol,
September 1976
, D. Olu-Pitt leg. [
MRAC
148.466]
.
Diagnosis.
A. rutilia
differs from the other four
Agraecina
species known by the long, parallel, closely adjacent ID which are curled and connected to small, clearly defined subglobular ST1 and ST2 at their posterior and anterior ends, respectively.
Description.
Male
unknown.
Female (
holotype
). Total length 3.68. Carapace length 1.47,
w 1.10
, pale ochre with dark striae radiating from fovea. Fovea brown, pronounced, length 0.24, anterior end 0.97 from front end of carapace. Both eye rows procurved from front and recurved from above. AER
w 0.32
, PER
w 0.46
, four straight hairs in front of AER. All eyes subequal, except AME whose diameter is 1/3 of diameter of others. AME separated by a distance equal to their diameter, and separated from ALE by 1/2 of AME diameter. PE separated by slightly less than their diameter, PME slightly closer to PLE than to each other. MOQ depth 0.16, anterior
w 0.12
, posterior
w 0.24
. Clypeus slightly larger than diameter of AME, chilum absent. Chelicerae yellow, with three teeth along promarginal cheliceral rim, largest one in the middle and smallest one furthest from fang base, and two teeth on retromarginal rim, smallest one closest to fang base. A large curved seta in front of fang base. Sternum yellow, smooth, shield-shaped, length 0.79,
w 0.71
. No PCT, no ICS, PLB inconspicuous and isolated. Labium slightly wider than long. Endites long, parallel sided, not notched, no apical hair tuft. Serrula present. Abdomen do unicolorous grey, sparsely covered with thin brown hairs, ve pale greyish white. ALS conical, with short terminal article, PMS short, triangular, with three large cylindrical gland spigots, PLS subcylindrical, stout, separated by a distance equal to their length. Trochanters notched, retrocoxal hymen small, hyaline, feathery hairs present on legs. Legs unicolorous yellow, leg formula 4123, leg length I 3.81 II 3.66 III 3.34 IV 4.68. No vt preening brush on mt III or IV. Tarsi without claw tufts or tenent hairs, claws with 5–10 teeth. Leg spination (
Fig. 2 E
) fe: I pl 0-0-1 do 1-1-1; II pl 0-0-1 do 1-1-1; III do 1-1-3; IV do 1-1-3; pa: III dt 1; IV dt 1; ti: I plv 1-1-0 rlv 1-1-0; II rlv 1-1-0; III pl 1-1-0 do 1-1-0 rl 1-1-0 plv 1-1-1 rlv 0-1-1; IV pl 1- 1-0 do 1-0-1 rl 1-1-0 plv 1-1-1 rlv 0-1-1; mt: I plv 1-1-0 rlv 1-1-0; II plv 1-1-0 rlv 1-1-0; III pl 0-2-2 rl 0-2-2 plv 1-1-1 rlv 1-1-1; IV pl 1-2-2 rl 1-2-2 plv 1-1-0 rlv 1-1-0 vts 1.
FIGURE 3 A–B.
Agraecina rutilia
.
C–G.
Cybaeodes liocraninus
, holotype. A, epigyne of holotype; B, vulva MRAC 148.466; C, carapace, do; D, carapace, lat; E, sternum and mouth parts, ve; F, carapace, fr; G, leg IV, tarsal tip. Scale bars: A, B, G: 0.1; C–F: 0.5.
FIGURE 4 A–G.
Cybaeodes testaceus
, holotype. A, carapace, do; B, carapace, lat; C, sternum and mouth parts, ve; D, carapace, fr; E, epigyne; F, leg I, tarsal tip; G, leg III, tarsal tip. Scale bars: A–D: 0.5; E: 0.25; F–G: 0.1.
Epigyne (
Fig. 3 A
) only weakly sclerotised, semitransparent, without a clear median septum. CO anterior. Vulva (
Fig. 3 B
) with anterior CO, long, parallel, closely adjacent ID curled at both ends. Anteriorly, the ID are connected to small, subglobular ST2, posteriorly to almost isodiametric ST1.
Discussion.
Due to its notched trochanters, long and narrow carapace, ti I, mt I and mt II with two ve spine pairs, ti II with only two rlv spines, as well as its vulvar structure and an epigyne without a clear median septum,
A. rutilia
does not belong in
Apostenus
. However, all these characters, especially the leg spination (compare
Figs. 2 E and 2 F
), are compatible with a place in the genus
Agraecina
(
Fig. 8 D
). Based on vulvar structure,
A. rutilia
displays the highest level of vulvar complexity of all known
Agraecina
species. One can hypothesise a series starting with the simple vulva of
A. canariensis
and
A. hodna
, where the wide, divergent ID are gradually merging into inconspicuous ST1 and ST2 at their anterior and posterior ends, respectively, resulting in a dumbbell shape (
Wunderlich 1992
;
Bosmans 1999
), leading over the terminally curled and enlarged combination of ID and ST1-ST
2 in
A. cristiani
and
A. lineata
(
Weiss & Sarbu 1994
;
Bosmans 1999
) to the terminally curled ID connected to clearly defined ST1 and ST2 of
A. rutilia
.
Distribution.
Sierra Leone
.