Actinopus princeps 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 : 238-240

Actinopus princeps Chamberlin, 1917

Figs 215–217 , Map 17

Actinopus princeps Chamberlin, 1917: 31 (holotype ♀, Rio de Janeiro, Rio de Janeiro, Brazil, MCZ 5, examined); World Spider Catalog, 2020.

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

Diagnosis. Females of A. princeps are recognized by the following combination of characters: bilobed receptacles, swelling laterally, with internal lobe slightly smaller than external lobe ( Fig. 217 A–D); PME with the same size as PLE; carapace triangular and slightly rounded anteriorly ( Fig. 215 B ).

FEMALE (IBSP 114503): Total length 23.24; Carapace, long 9.21; wide 8.48. Carapace anterior part triangular and posterior part rounded. Anterior eye row procurved, posterior row recurved. Many long and short bristles between AME-clypeus, many widespread bristles in interdistances PME–PME and PLE–PLE. Short bristles between lateral eyes-edge of carapace ( Fig. 215 B ). Sternum with eight sigilla strongly fused medially ( Fig. 215 C ). Rastellum protuberant, rectangular, hirsute, with many short spines covering the dorsal surface of rastellum ( Fig. 215 E–F). Subinguinal sulci with many denticles bordering prolateral row of teeth. Teeth of prolateral row decreasing in distal-proximal way; teeth of retrolateral row with three denticles forming parallel row ( Fig. 215 D ). Patella and tibia III with distal developed crowns of thorns ( Fig. 216 A, B ). Distal part of prolateral and retrolateral surfaces of patellae III with strong spines ( Fig. 216 A ). Tibia III with strong spines along retrolateral surface of article and patellae IV with the same spines at prolaterodorsal surface ( Fig. 216 B–C). Tibia IV without spines on dorsal surface and with long bristles on prolaterodorsal surface ( Fig. 216 D ). Many robust spines on the ventral surface of the tarsi III and IV; And at prolateral and retrolateral surfaces of tarsi and metatarsi I and II. Carapace reddish-brown, with a conspicuous yellowish triangular region in the ocular region ( Fig. 215 B ). Sternum pale orange; chelicerae red-brown; legs with femora reddish-brown and the rest of articles clearest than femora; sternum slightly orange; And abdomen pale beige ( Fig. 215 A ). 18 labial cuspules, 105 on right maxilla and 163 on left. Eyes: Diameters: PME 0.51, PLE 0.47, ALE 0.48,AME 0.46; MOQ:Length 1.68,front width2.89, back width 1.01; Interdistances: PME–PME 2.26, PLE–PME 0.19, AME–AME 0.32, ALE–AME 0.87, ALE–PLE 0.83, AME–PME 0.87. Ocular area: OAL 6.77, OAW 5.35, and IF 3.68. Body: Clypeus: 0.38; Fovea: 3.94; Labium: long 2.48; wide 1.79; Chelicerae: long 5.53; wide 3.09; Sternum: long 6.32; wide 5.25. Abdomen: long 12.46; wide 9.66. Leg measurements: I: Fe 5.15/ Pa 3.15/ Ti 2.3/ Me 2.86/ Ta 1.54/ total 15. II: Fe v0, d0, p0, r0; Pa v0, d0, p0, r0; ti v5-22-23, d0, p0, r0-9-11; Me v0-4-3, d0, p3-5-5, r5-12-5; ta v2-2-3, d0, p2-2-3, r3-5-3. III: Fe v0, d0, p0, r0; Pa v0, d0-4-29, p0-1-0, r0-2-11; ti v2-9-13, d0- 1-15, p0-0-3, r0-9-12; Me v0-10-16, d10-6-5, p0, r0-5-9; ta v19-20-26, d0-0-4, p7-11-9, r1-7-4; IV: Fe v0, d0, p0, r0; Pa v0, d16-13-7, p2-0-0, r0; ti v0, d0, p0-0-1, r0; Me v0-0-3, d0-0-1, p0-1-3, r0; ta v7-9-16, d0-0-2, p7-9-12, r0. Spermathecae: Seminal receptacles longer than wide, with short ducts and a constriction in the middle. Lobes of external receptacles longest than internal lobes. In both receptacles, sclerotized region reaching the receptacles distal half ( Fig. 217 A–D).

VARIATION

FEMALES (n=6): Eyes: Diameters: PME 0.24–0.51, PLE 0.32–0.52, ALE 0.29–0.6, AME 0.19–0.46; MOQ: Length 1.11–1.68, front width 0.73–3.05, back width 1.01–3.43; Interdistances: PME–PME 1.59–2.64, PLE–PME 0.19–0.23, AME–AME 0.15–0.45, ALE–AME 0.53–1.24, ALE–PLE 0.54–0.92, AME–PME 0.68–0.89. Ocular area: OAL 4.91–7.9, OAW 3.66–5.92, and IF 2.26–3.81. Body: Total length: 12.52–29.32; Carapace: Length 6.29–10.09; wide 5.99–10.27; Clypeus: 0.19– 0.53; Fovea: 2.42–4.24; Labium: Length 1.88–3.09; wide 1.41–2.16; Chelicerae: Length 3.91–6.69; wide 2.11–3.69; Sternum: Length 4.95–7.25; wide 4.1–6.16. Abdomen: Length 6.58–16.19; wide 5.72–12.07. Legs: I: Fe 2.19–6.08/ Pa 1.62–4.09/ Ti 1.25–2.53/ Me 1.1–3.62/ Ta 0.88–1.93/ total 7.04–18.21. II: 2.52–6.2/ 1.65–4.15/ 1.11–2.73/ 1.57–3.87/ 0.82–2.02/ 7.67–18.51. III: 3.29– 5.63/ 2.72–4.77/ 1.35–1.77/ 1.98–3.77/ 0.78–1.51/ 10.14– 17.17. IV: 4.63–7.69/ 2.86–4.92/ 2.57–4.47/ 2.86–4.72/ 1.2–2.13/ 14.09–23.56. Spermathecae: External lobes on each receptacle fluctuate in size than longer than internal lobes to the same size. The constriction in the middle of the receptacles can be pronounced ( Fig. 217 A, D ) or discrete ( Fig. 217 B, C ).

Distribution. BRASIL. Rio de Janeiro: Rio de Janeiro, Nova Friburgo, Itatiaia, Resende, Barra do Piraí, Piraí ( Map 17 ).

Examined material. BRAZIL: Rio de Janeiro: [22º 54’ S 43º 12’ W] , 3♀, viii.1986 ( IBSP 114503 , 123248 , 123249 ); Nova Friburgo, [22° 17’ 13.5594” S 42° 32’ 0.9594” W] , 1♀, ii.1981, P. Mix leg. ( IBSP 104607 ); Itatiaia and Resende, [22º 19’– 22º 45’ S 44º 15’– 44º 50’ W], Parque Nacional de Itatiaia , 1♀, 02.iv.1995, C. Late leg. ( IBSP 108889 ); Barra do Piraí , [22º 28’ S 43º 49’ W] , 3♀ ( AMNH); Piraí, Bairro Varjão, [22º 37’ 46” S 43º 53’ 53” W] , 1♀, 15.iv.2005, A. B. Vargas and R. P. Indicatti leg. ( IBSP 114470 ) .

Figures

MAP 17. Distribution map of Actinopus princeps Chamberlin, 1917.

FIGURE 215. Actinopus princeps Chamberlin, 1917, female: A–F IBSP 14503: A. Abdomen, dorsal; B. Carapace, dorsal; C. Sternum, ventral; D. Cheliceral teeth, ventral; E. Rastellum, dorsal; F. Rastellum, ventral. Scales lines: B: 0.5 mm, D: 1 mm.

FIGURE 216. Actinopus princeps Chamberlin, 1917, female: A–D IBSP 14503: A. Patella III, dorsal; B. Tibia III, dorsal; C. Patella IV, dorsal; D. Tibia IV, dorsal. Scales lines A–C: 0.5 mm.

FIGURE 217. Actinopus princeps Chamberlin, 1917, holotype, female: A MCZ 5: A. Spermathecae, dorsal view. Photo: R. Saturnino. B IBSP 114503, C IBSP 114470 and D IBSP 108889: B–D Spermathecae, dorsal view. Arrows: Receptacle swellings. Scales lines: 0.5 mm.