Actinopus xenus Chamberlin, 1917

Miglio, Laura Tavares, Pérez-Miles, Fernando & Bonaldo, Alexandre B., 2020, Taxonomic Revision of the Spider Genus Actinopus Perty, 1833 (Araneae, Mygalomorphae, Actinopodidae), Megataxa 2 (1), pp. 1-256 : 235-238

Actinopus xenus Chamberlin, 1917

Figs 213–214

Actinopus xenus Chamberlin, 1917: 29 (holotype ♀, South America, MCZ 3, examined); World Spider Catalog, 2020.

Note. The redescriptions below was based on images and measurements of the holotype, taken by R. Saturnino .

Diagnosis. Females of A. xenus are characterized by the following combination of characters: unilobed seminal receptacles, which are subquadrate in shape and parallel to each other; apical external edge of each receptacle longer than internal edge ( Fig. 214 A ). Smooth corrugated area on inner surface of Chelicerae less evident than in A. echinus ( Fig. 210 B ).

FEMALE (Holotype): Total length 15.38; Carapace , long 9.14; wide 8.9. Carapace anterior part square and posterior part triangular. Anterior eye row procurved, posterior row slightly recurved. Many short and long bristles between AME-clypeus, one long bristle between PLE–ALE, short and long bristles between posterior eyes-fovea and short bristles between lateral eyes-edge of carapace ( Fig. 213 A ). Sternum with eight sigilla strongly fused medially ( Fig. 213 B ). Rastellum protuberant, digitiform, hirsute, with a row of short spines on the edge of rastellum and many short spines covering the dorsal rastellum ( Fig. 213 D ). Chelicerae with denticles along prolateral row of teeth. Prolateral row with four megateeth and two teeth, decreasing in distal-proximal way. Retrolateral row with five megateeth and two teeth between three basal megateeth ( Fig. 213 C ). Patella III with distal interrupted crown of developed thorns and tibia III with distal crown of thorns ( Fig. 213 E–F). Patella IV with prolaterodorsal short spines along extension of article ( Fig. 213 G ). Tibiae IV without spines and with long bristles on prolaterodorsal surface; Metatarsus with few thorns on basal part of dorsal surface and along prolateral surface; tarsus with thorns on prolateral and retrolateral surfaces ( Fig. 213 H ). Carapace , chelicerae, sternum, coxae, trochantera, femora, patellae, Tibia , metatarsi, Tarsi and palp orangish-brown; And abdomen pale brown. Eyes : Diameters : MOQ: Length 1.51, front width 4.07, back width 3.83; Ocular area : OAL 8.22, OAW 5.50, and IF 3.42. Body : Fovea : 1.77. Abdomen : long 6.23; wide 3.97. Leg measurements: I: Fe 5.73. II: 3.63. III: 2.50. IV: 3.45. Formula 4123. Spermathecae : Subquadrates seminal receptacles, one parallel to each other, as long as wide, with short duct. Left receptacle with sclerotized region reaching the half of the receptacle. Right receptacle without sclerotized area in the basal region ( Fig. 214 A ) .

Distribution. South America (exact location unknown).

Examined material. Only the types.

Figures

FIGURE 210. Actinopus echinus Mello-Leit„o, 1949, female: A–F IBSP 102907: A. Abdomen, dorsal; B. Carapace, dorsal; C. Sternum, ventral; D. Cheliceral teeth, ventral; E. Rastellum, dorsal; F. Rastellum, ventral. Scales lines B–C: 0.5 mm, D: 1 mm.

FIGURE 213. Actinopus xenus Chamberlin, 1917, holotype, female:A–H MCZ 3: A. Carapace and chelicerae, dorsal; B. Sternum, ventral; C. Cheliceral teeth, ventral; D. Rastellum, dorsal; E. Patella III, dorsal; F. Tibia III, dorsal; G. Patella IV, dorsal; H. Tibia, metatarsos and tarsus IV, dorsal. Photos: R. Saturnino.

FIGURE 214 A. Actinopus xenus Chamberlin, 1917, holotype, female: A MCZ 03: A. Spermathecae, dorsal view. Photo: R. Saturnino.