Jocquestus, a new genus of trachelid sac spiders from the Afrotropical Region (Arachnida: Araneae) Author Lyle, Robin Author Haddad, Charles R. text Zootaxa 2018 2018-09-05 4471 2 309 333 journal article 29478 10.11646/zootaxa.4471.2.4 05d2a4ba-f50f-4645-bbb3-05cd83dcbd7e 1175-5326 1439724 691AD8B9-27BB-40E6-A3D8-C3D17DA38B0B Jocquestus obliquus sp. nov. urn:lsid:zoobank.org:act:67CA925C-D192-4CF2-AD2D-C29C16B2E6CA Figs 15, 16 , 56–60 Etymology. This species name is derived from the Latin for “oblique”, referring to the slanting, 45° angle of the epigynal ridges of the female epigyne. Diagnosis. Males of J. obliquus sp. nov. can be easily recognized by the uniquely coiled embolus ( Fig. 57 ), which is linear in all other Jocquestus species. The female can be recognised by the comma-shaped ST II that are narrower at their base than anteriorly, resulting in a clear median space separating their proximal parts ( Fig. 59 ). Further, the ducts linking ST I and II are placed halfway between the midline and lateral margins of the ST ( Fig. 60 ), as opposed to medially in congeners. Male ( paratype , Mkomazi Game Reserve, OUMNH) . Measurements: CL 1.56, CW 1.13, AL 1.71, AW 1.15, TL 3.24, FL 0.06, SL 0.78, SW 0.63, AME–AME 0.03, AME–ALE 0.02, ALE–ALE 0.22, PME–PME 0.07, PME–PLE 0.06, PLE–PLE 0.39. Length of leg segments (sequence from femur to tarsus, and total): I 0.94 + 0.44 + 0.65 + 0.52 + 0.40 = 2.95; II 0.87 + 0.42 + 0.63 + 0.56 + 0.38 = 2.86; III 0.70 + 0.38 + 0.48 + 0.56 + 0.27 = 2.39; IV 0.82 + 0.44 + 0.63 + 0.74 + 0.30 = 2.93. Carapace orange-brown, with faint black mottling ( Fig. 15 ); surface finely wrinkled, with sparse short, fine setae; fovea short, broad, slightly darker than carapace, at two thirds CL. All eyes surrounded by black rings; AER procurved; AME slightly smaller than ALE; clypeus height slightly greater than AME diameter; AME separated by distance slightly less than half their diameter; AME separated from ALE by distance equal to one-quarter AME diameter; PER recurved, PLE slightly larger than PME; PME separated by distance slightly less than their diameter; PME separated from PLE by distance slightly less than PME diameter. Chelicerae orange-brown, anterior surface with scattered long, fine setae; two promarginal teeth, distal tooth largest; two smaller retromarginal teeth, proximal tooth largest. Sternum yellow-brown, with faint black mottling, darker along border; surface smooth, with scattered short, fine setae. Abdomen dark grey, with two paired cream markings, first subtriangular pair anteriorly, second transverse pair anterior to midpoint ( Fig. 15 ); two pairs of yellow-brown sigilla, first pair at one-third abdomen length, second pair at midpoint of abdomen; surface sparsely covered with short, fine setae. Legs I to IV with femora orange-brown, paler proximally, with grey mottling dorsally and laterally; patellae to metatarsi I–IV yellow-brown, with faint grey mottling; tarsi uniform orange-brown; all segments covered with short, fine setae; relatively dense ventral scopulae on distal metatarsi and tarsi legs III and IV; leg spination: tibiae: I plv 8 rlv 3 cusps; metatarsi: I plv 8 cusps; tarsi: I plv 1 cusp ( Fig. 56 ). Palp orange-brown; RPA subquadrangular in retrolateral view, ventral end slightly pointed; tibia with small rounded retrolateral-dorsal RTA, with small sharp projection on its dorsal surface; embolus originating prolaterally on tegulum, parallel-sided long its length, distal half forming broad coil ending near cymbium tip; embolus associated with narrow membranous conductor, originating prolaterally on tegulum near embolus base ( Figs 57, 58 ). Female ( holotype , Mkomazi Game Reserve, MRAC 211323) . Measurements: CL 1.47–1.55, CW 1.14– 1.15, AL 1.49–1.90, AW 1.08–1.25, TL 2.96–3.60, FL 0.04–0.05, SL 0.78–0.85, SW 0.61–0.68, AME–AME 0.03, AME–ALE 0.03, ALE–ALE 0.25, PME–PME 0.08, PME–PLE 0.08, PLE–PLE 0.43. Length of leg segments (sequence from femur to tarsus, and total): I 0.97 + 0.43 + 0.70 + 0.55 + 0.48 = 3.13; II 0.93 + 0.43 + 0.65 + 0.60 + 0.43 = 3.04; III 0.73 + 0.40 + 0.45 + 0.58 + 0.30 = 2.46; IV 0.90 + 0.43 + 0.70 + 0.78 + 0.35 = 3.16. Carapace reddish-brown ( Fig. 16 ); surface finely granulate, covered with short fine setae; fovea short, indistinct, slightly darker than carapace, at two thirds CL; ocular region brown; AER slightly recurved, almost straight; AME and ALE equal in size; clypeus height approximately equal to AME diameter; AME separated by distance equal to 0.7 their diameter; AME separated from ALE by distance equal to 0.4 AME diameter; PER recurved, PLE slightly larger than PME; PME separated by distance slightly larger than their diameter; PME separated from PLE by distance equal to 1.4 PME diameter. Chelicerae brown, anterior surface with sparse long, fine setae; two promarginal teeth, distal tooth largest; two retromarginal teeth, proximal tooth largest. Sternum pale brown, darker towards borders; surface smooth, with scattered short, fine setae. Abdomen dark grey, with two pairs of pale yellow sigilla, anterior and posterior to midpoint of abdomen ( Fig. 16 ). Legs I to IV uniform brown, femora darker than other segments; relatively dense ventral scopulae on metatarsi and tarsi of all legs, more prominent on legs III and IV; regular leg spines, cusps absent. Other characters as for male. Epigyne weakly sclerotised; epigynal ridges and CO at 45° angle to epigastric fold, CO situated laterally; large ST II connected with lateral entrance ducts, with folded median ducts connecting ST I and ST II; ST I bilobed when examined dorsally ( Figs 59, 60 ). Type material. Holotype : ♀ : TANZANIA : Mkomazi Game Reserve , near Dindira Dam , 04°00'S , 38°00'E , leg. A. Russell-Smith , 25.I.1996 (in gall on Acacia drepanolobium ) ( MRAC 211323 ). Paratypes : TANZANIA : Mkomazi Game Reserve , 03°55'S , 37°48'E , leg. G.C. Mc Gavin , 9.IV.1995 (canopy fogging 2/28, Combretum molle ), 1♀ ( OUMNH ) ; same data but canopy fogging 2/30, Combretum molle , 1♂ ( OUMNH ) . Distribution. Known only from the type locality ( Fig. 70 ). Habitat and biology. An arboreal species collected from Vachellia drepanolobium and Combretum molle in savanna habitats in northern Tanzania .