Two new genera of small, six-eyed pholcid spiders from West Africa, and first record of Spermophorides for mainland Africa (Araneae: Pholcidae)
Author
Huber, Bernhard A.
text
Zootaxa
2007
1635
23
43
journal article
10.5281/zenodo.179534
8078a54c-e67b-4e6f-aaf2-78c18c7d1821
1175-5326
179534
Spermophorides
Wunderlich, 1992
Spermophorides
Wunderlich, 1992
: 324
–325
Diagnosis.
A diagnosis that reliably covers all known representatives of this genus is beyond the scope of this paper and must await a revision or at least a large comparative study of the genus. The original diagnosis of the genus does not allow a distinction from several other small six-eyed pholcids, like
Spermophora
,
Buitinga
,
Quamtana
(part),
Belisana
, and others. The only character visible using untreated specimens and light microscopy that seems to reliably identify most
Spermophorides
species is the peculiar attachment site of the procursus to the cymbium, i.e. rather distal than proximal (see e.g., figs.
228, 243 in
Wunderlich 1987
; figure
229 in
Wunderlich 1992
; figs. 3, 11, 19, 27, 35, 41 in
Senglet 1972
; fig.
3 in
Senglet 1973
).
FIGURES 57–61.
Anansus debakkeri
n. sp.
57, 58.
Left palp, prolateral and retrolateral views.
59.
Left procursus, retrolateral view.
60, 61.
Cleared female genitalia, ventral and dorsal views. b, genital bulb; e, embolus; ep, epigynal pocket; p, procursus; pp, pore plate. Scale lines: 0.2 mm.
A further character that is easily accessible and that seems to separate most
Spermophorides
species from most other pholcids, is the relationship between tibia 1 length and metatarsus 1 length.
Figure 75
shows that in most pholcids with comparable tibia 1 lengths (~
2.5–5.5 mm
) the metatarsus 1 is significantly longer than the tibia 1. In
Spermophorides
, both leg segments are approximately the same length. Only a few species of the South American genus
Chibchea
fall among the
Spermophorides
species in the scatter in
Figure 75
. Remarkably, the
Seychelles
species (
S. lascars
) does not group with the other
Spermophorides
species (measurements according to fig.
64 in
Saaristo 2001
: tibia 1: 1,8; metatarsus 1: 2,2).
A distinctive character that seems to unite the Mediterranean, at least some Canary Island, and the Tanzanian species below requires clearing or SEM study of the epigynum: the pockets on the posterior epigynal plates.
Senglet (1972)
emphasized the importance of these pockets (his “alvéoles d’ancrage de la lèvre postérieure de l’épigyne”) for the identification of Mediterranean
“
Spermophora
”
(now
Spermophorides
) species. They have not been described or illustrated for Canary Island species, but were found to be present in
S. mercedes
(Wunderlich)
and an unidentified species from Lanzarote checked for this character (B. A. Huber, unpublished data).
Finally, the absence of male epiandrous spigots is very rare in pholcines (outside
Spermophorides
only known in
Nyikoa limbe
, see above), and has been verified in one Mediterranean species (
S. mediterranea
[Senglet]), two Canary Island species (
S. cuneata
[Wunderlich],
S. mercedes
), and the Tanzanian species below (Figs. 68–70).
Relationships.
As in previous analyses (e.g.,
Huber 2005
),
Spermophorides
falls in a group of African genera including
Buitinga
(East Africa) and
Paramicromerys
(
Madagascar
)
, as well as some species tentatively assigned to
Spermophora
(East Africa,
Madagascar
,
Comoros
). All these taxa (clade
5 in
Fig. 1
A) share the loss of the “piriform gland spigots” on the ALS (Figs. 67, 73). More important than these intergeneric relationships are, in the present context, the data that support inclusion of the Tanzanian species below in a genus that was previously known only from the Canary Islands, the Mediterranean, and one species from the
Seychelles
. Three characters support this assignment: pair of pockets on the posterior epigynal plate (
Figs. 65, 66
; unique in pholcids), loss of epiandrous spigots (Fig. 68; in pholcines otherwise only known in
Nyikoa limbe
), and the peculiar attachment site of the procursus to the cymbium (rather distal than proximal, similar only in
Spermophora sangarawe
, see fig.
235 in
Huber 2003b
). Whether the
Seychelles
species (
S. lascars
Saaristo
) shares any of these characters is unknown.
Distribution.
The genus was previously known from the Canary Islands (plus the Salvage Islands), southwestern Europe (
Spain
,
France
,
Corsica
, Sardinia,
Italy
), and one uncertain species from the
Seychelles
. The new species below extends the known distribution to include mainland Africa.