A New Species of the Tracheline Genus Fuchibotulus Haddad & Lyle, 2008 (Araneae: Corinnidae)

ABSTRACT A new species of the tracheline genus Fuchibotulus Haddad & Lyle, 2008 (Araneae: Corinnidae) is described. Fuchibotulus haddadi sp. n. is only known from the type locality in the Eastern Cape Province, South Africa. An updated diagnostic key to all known species of the genus is provided.


INTRODUCTION
Fuchibotulus Haddad & Lyle, 2008 is one of several recently described tracheline sac spider genera (Araneae: Corinnidae) from the Afrotropical Region (Haddad 2006;Haddad & Lyle 2008;Lyle & Haddad 2009, 2010. The genus originally included only two species, F. bicornis Haddad & Lyle, 2008 (type species) and F. kigelia Haddad & Lyle, 2008. Both species were described on the basis of males and females. The new spe cies described herein, F. haddadi sp. n., is known only from females. With the inclusion of the new species, the range of the genus is expanded to include the Eastern Cape Province of South Africa.
In the subfamily Trachelinae, Fuchibotulus is similar in appearance to Fuchiba Haddad & Lyle, 2008, sharing a number of morphological characters. Both are robust trachelines lacking any cusps and spines on the legs with (Haddad & Lyle 2008).
However, the two genera differ from each other in abdominal characteristics. Mem bers of Fuchiba have dorsal scutum present in males and absent in females, while Fu chibotulus only has dorsal sigilla with several pairs of minute intermediate sclerites be tween them ( Fig. 3) in both sexes. In F. haddadi sp. n., the sigilla are absent in some in dividuals in the type series. Members of Fuchiba have a finely granulated carapace sur face texture, while in Fuchibotulus the surface texture is strongly tuberculated. The ge nitalia are also genus-specific. The palp of Fuchiba males have a short, coiled embolus si tuated dis tally on the tegulum with a simple single retrolateral tibial apophysis. In Fu chi botulus, the embolus is needle-like associated with a small membranous conductor and a ret rolateral tibial apophysis that is either single or bifid with a small tooth-like apo physis. The Fuchiba females have copulatory openings laterally situated in a large cir cular de pression with large circular spermathecae, while those of Fuchibotulus have smaller co pulatory openings with sausage-like spermathecae and tightly twisted en trance ducts.

MATERIAL AND METHODS
Specimens were prepared following the method used by Haddad and Lyle (2008). Digital habitus photographs were taken using a high resolution microscopy camera AxioCam MRc5 mounted on a Zeiss Axio Zoom V16 microscope. Extended focal ranges were stacked using the ZEN module Z-stack software.
Body measurements were taken of the largest and smallest specimens to determine a size range. Eye and leg measurements were taken from the second largest specimen. All measurements are given in millimetres (mm).
The type series is deposited in the Ditsong National Museum of Natural History (for merly Transvaal Museum), South Africa (TMSA Carapace: Bright to deep orange; slightly rounded with steep decline in last fifth of ca rapace, highest point at approx. 0.4 carapace length; surface finely granulate with short, fine setae; fovea small, distinct, at 0.8 carapace length; clypeus height equal to AME diameter. Eyes: Black rings around eyes; AER very slightly recurved; lateral eyes slightly larger than median eyes; AME separated by distance slightly larger than their diameter, AME separated from ALE by 0.25 AME diameter; PER strongly recurved; PME separated by their diameter, PME separated from PLE by nearly double PME diameter. Chelicerae: Pale to deep orange; surface granulated with scattered, short and long setae; cheliceral furrow with three promarginal teeth, largest tooth medially; three ret romarginal teeth, largest tooth situated proximally to fang, smallest distally. Sternum: Shield-shaped; pale orange to orange, surface texture smooth, covered in short, fine setae; length 1.5× width. Abdomen: Pale to mottled grey with yellow undertones; heartshaped with distinct notch anteriorly, tapering posteriorly; dorsal scutum absent; paired brown sigilla and intermediate sclerites present, varying between specimens, sometimes absent (Figs 1, 3); ventral sclerites on either side of epigyne; surface texture smooth, covered in short, fine setae. Legs: Light brown to orange; all segments covered with short, fine setae; dense scopulae on tarsi and distal part of metatarsi III and IV. Epigyne: Small median hood present, triangular; copulatory openings situated medially in short, inverted U-shaped ridges that are as long as broad (Figs 2, 4); entrance ducts twisted an teriorly before entering sausage-like ST II, extending posteriorly to approx. ⅔ of epigynal length (Fig. 4); ST I comprises two lateral bilobed receptacles linked to narrow fertilisation ducts (Fig. 5).
Distribution: Known only from type locality (Fig. 6).  short, very strongly curved U-shaped ridges, nearly as long as broad (Fig. 4) (Haddad & Lyle 2008) (Fig. 6). The record of the new species in the Eastern Cape Province highlights insufficient knowledge on this genus, as well as the need for more intensive sampling for elusive genera like Fuchibotulus.

Key to species of
The recent advance of knowledge on tracheline spiders in the Afrotropical fauna has exposed the largely undescribed diversity of the subfamily (Haddad 2006;Lyle & Haddad 2006, 2009, 2010Haddad & Lyle 2008;Lyle 2008Lyle , 2011Haddad et al. 2011). A large degree of variation in important morphological traits among various genera has strengthened the need to resolve the taxonomy of the subfamily. Once the taxonomy is resolved and all taxa are clearly defined, a phylogenetic study can be undertaken to determine relationships between the genera.