Dresserus

Miller, Jeremy A., Griswold, Charles E., Scharff, Nikolaj, Řezac, Milan, Szűts, Tamas & Marhabaie, Mohammad, 2012, The velvet spiders: an atlas of the Eresidae (Arachnida, Araneae), ZooKeys 195, pp. 1-144 : 35-39

Dresserus sp. Figs 1D4B8 I–L12G–I 16C, F33-39

Description.

Male (Manga Forest Reserve, Tanzania, ZMUC): Carapace with few white setae, mostly in thoracic region; cephalic region subrectangular, wider than long, moderately raised; AME distinctly smaller than PME (AME/PME 0.71), median eyes overlapping on horizontal axis, separated on vertical axis; ALE placed on pointed apophyses, PER slightly wider than AER (PER/AER 1.04), PLE position on carapace 0.27, clypeal hood forms obtuse angle, fovea deep. Chelicerae slightly excavated mesally, with lateral boss. Legs with white setae, with row of distal ventral macrosetae on metatarsus II–IV. Abdomen dark gray, nearly encircled by a band of white setae (Figs 8I, J, 33 A–D).

Male palp with dorsal-ventral axis; tegulum disc-shaped; conductor arises on broad membranous stalk from center of tegulum, with arching distal and proximal arms covering much of mesal portion of palpal bulb, distal arm larger than proximal, fringe absent (Fig. 34D); embolus makes slightly more than one loop, long and flexible, fits into groove originating on prolateral arm of conductor; cymbium without distinct macrosetae (Figs 12 G–I, 33 I–K, 34 A–D).

Female (Mazumbai, Tanzania, CASENT 9025747, CAS): Carapace without conspicuous white setae; cephalic region subrectangular, about as wide as long, moderately raised; AME distinctly smaller than PME (AME/PME 0.41), median eyes overlapping on horizontal axis, separated on vertical axis; ALE tubercles absent; PER as wide as AER (PER/AER 1.04), PLE position on carapace 0.27; clypeal hood forms obtuse angle, fovea deep. Chelicerae contiguous mesally, with lateral boss (Fig. 35E, F). Legs with white setae, with row of distal ventral macrosetae on metatarsus II–IV. Abdomen without conspicuous white setae (Figs 8K, L, 33 E–H).

Epigynum with pair of longer-than-wide atria on posterior margin separated by hirsute cuticle (Figs 16C, 37D). Vulva with copulatory ducts making one loop leading to anterior complex of spermatheca and spermathecal head. Fertilization duct runs posteriorly through the copulatory duct loop (Figs 16F, 37E).

Spinneret spigot morphology

(Mazumbai, Tanzania, CASENT 9025746, CAS and CASENT 9025747, CAS). Female ALS with at least 4 MAP within and 4-6 along inner edge of spinning field of more than 40 PI (Figs 36B, 37A); male with 4 MAP within and 3-5 along inner edge of spinning field of about 35 PI spigots (Fig. 39 B). Female PMS longitudinally elongate, transversely bilobed, with 2 anterior mAP, between these 2-3 AC, posterior to this on anterior and posterior lobes a dense field of more than 105 short, squat, conical CY spigots (Figs 36C, D, 37B, C); male PMS small, oval, with 2 anterior mAP and 3 AC (Fig. 39C). Female PLS with anterobasal MS without accompanying spigot and distal field of 9 AC (Fig. 36E); male same (Fig. 39D, E). Male cribellar plate with no sign of spigots; epiandrous gland spigots present (Fig. 39F).