Actinopus insignis (Holmberg, 1881)

Ríos-Tamayo, D. & Goloboff, P. A., 2018, Taxonomic Revision And Morphology Of The Trapdoor Spider Genus Actinopus (Mygalomorphae: Actinopodidae) In Argentina, Bulletin of the American Museum of Natural History 2018 (419), pp. 1-84 : 64-66

A. insignis , A. gerschiapelliarum , A. taragui , A. puelche , and A. palmar ).

DESCRIPTION: Holotype male (MACN-Ar 36582, figs. 32A–G): Total length: 17.04. Carapace (fig. 32A): length 5.58, width 5.40, semirounded. Cephalic region : length 3.24, width 3.96; clypeus small with 1 large bristle and 27 small ones on both sides, 8 bristles between AME-ALE, 29 bristles between PME and 10 behind each PME-PLE dyad, 4 small bristles on row to fovea, 5 on each side of the OQ. Fovea : length 0.72, width 1.92, subsquare. Eyes , diameters and interdistances: AME 0.24 (large), ALE 0.44, PME 0.24, PLE 0.36, OQ length 1.12, anterior width 2.96, posterior width 2.72; AME-ALE 0.60, PME-PLE 0.08, AME-PME 0.40, ALE-PLE 0.52, AME-AME 0.44. Chelicerae : Length 3.30, width 1.68, with shallow dorsal grooves; cheliceral apex with 14 recumbent and elongated bristles that cover the base of the fang. Cheliceral prolongation without cusps; furrow with 7 promarginal teeth, 7 retromarginal (a smaller one between 5th-6th and 6th-7th) and 9 denticles, near the promarginal teeth. Labium : length 1.52, width 1.20. Maxillae : anterior length 1.50, posterior length 2.28, width 1.60. Sternum (fig. 32G): Central slight depression; length 4.00, maximum width 3.48, minimum width 1.20. Postlabial sigillum deep, posteriorly reaching the middle of the sternum; posterior sigilla shallow, well defined and distant from the margin. Abdomen : Length 6.84, large, covered dorsally by small and thick bristles. PMS: length 0.56; PLS: length of basal:medial:apical segments 0.80:0.48:0.32. Spigots : 1 large, 28 small on PMS; PLS, numbers of large(small) spigots on basal:medial:apical article 4(48):5(40):2(50). Lengths of legs and palp: I: 6.00, 2.52, 3.60, 3.90, 2.40, 18.42. II: 5.52, 2.52, 3.42, 4.02, 2.40, 17.88. III: 4.80, 2.40, 2.64, 4.38, 2.58, 16.80. IV: 6.00, 2.70, 4.80, 4.80, 3.00, 21.30. Palp: 5.16, 2.46, 4.38, –, 1.38, 13.38.

Chaetotaxy: Palp: 0. All femora: 0. Patella: I-II, 0; III, 22 P SUP-D ANT +8 on the margin, 1 D B, 2-2-3 R (1:3 A) +9 on the margin; IV, 36 P SUP-D ANT. Tibiae: I, 0; II, 20 R INF, 1-1 v post; III, 1 D B, with a crown of 17 thorns, 1-2-3-4-1 R (1:2 A); IV, 3-1-3 v (1:2 A). Metatarsi: I, 1-0-1 V POST, 1-1 V ANT (1:3 A); II, 1-1-1-1-1-2-1-3 R INF, 1-1 V ANT (1:2 A), 1-1 v post; III, 1-2-1- 1-2-1-1-2-5 D POST-R, 1-1-1-1-1-1-1-4 D ANT- P, 1-2-2-2-2-1-1 V POST, 1-2-1-1-3-3-2-2 V ANT-P INF; IV, 2-1-2-3-1-3-2-3-2-2-4 P, 1 D A ANT, 1-1-2-2-3 R INF (1:2 A), 1-1-1-1 V. Tarsi: I, 1-1-1 P INF, 1-1-2-1-1-2 R INF; II, 1-1-1-1-1 P INF, 1-1-1-2-1-1-2 R INF; III, 1-1-2-2-1-2-2 P INF, 1-1-1-1-1-3-2 R INF (2:3 A); IV, 1-2-2-3-3- 3-3-4 P INF, 2-1-3-3-2-2-1-4 R INF (3:4 A). Total number of retrolateral spines on tibiae I and II (fig. 32C): 0 and 20 respectively. Palp: Tibia long and slender (width/length: 0.29±0.01) (fig. 32B). Copulatory bulb (fig. 32D–F) with a wide tegulum. ATA poorly developed, BTA well developed; embolus wide, with MRk and a series of denticles at the base. Pseudoscopula: Tarsi: I sparse (1:2 A, more abundant A); II sparse, distributed throughout the segment (more abundant A); III-IV, dense and uniform (uniformly distributed throughout the segment). Metatarsi: III sparse and apical; IV, sparse 1:2 A. Trichobothria: Tibiae: I 5-4; II 5-7; III 6-7; IV 7-5. Metatarsi: I 11; II 10; III 9; IV 7. Tarsi: I-III 9; IV 7. Color: Carapace reddish brown; cephalic region and chelicerae darker. Abdomen brown, booklungs with light markings. Sternum light reddish brown; labium and maxillae darker. Spinnerets light brown. Legs like carapace; tarsi-metatarsi lighter; palp tibiae light.

Paratype female (MACN-Ar 19830, figs. 33A– E): Total length: 17.40. Carapace (fig. 33A): length 5.64, width 5.16, with 15 bristles on each posterior margin. Cephalic region: Length 3.48, width 4.32; clypeus with 48 bristles, chilum with 22; 3 bristles between AME-ALE, 29 between PME and 10 forming a band anterior to the fovea; 9 bristles behind each PME-PLE dyad, 4 on each side of the OQ. Numerous smaller bristles at the back of the cephalic region, more abundant in the lateral curves of the fovea. Fovea: length 0.72, width 1.92, subsquare. Eyes, diameters and interdistances: AME 0.16, ALE 0.40, PME 0.24, PLE 0.28, OQ length 1.00, anterior width 2.80, posterior width 2.60; AME-ALE 0.80, PME-PLE 0.12, AME-PME 0.44, ALE-PLE 0.48, AME-AME 0.28. Chelicerae: Length 2.70, width 1.80; small bristles on the posterior lateral part with shallow grooves on 1:2 A; cheliceral apex with 15 recumbent and elongated bristles covering the base of the fang. Rastellum with 12 blunt marginal cusps, and 10 smaller dorsal ones. Fang groove with 7 promarginal teeth, 6 retromarginal ones (three small internal ones near the 5th tooth), and 12 denticles in the furrow, near the promargin. Labium: length 1.40, width 1.20, with 15 anterior cuspules. Maxillae: anterior length 1.50, posterior length 2.16, width 1.60, with +110 cuspules 1:3 V ANT, extending to the anterior face. Sternum (fig. 33E): With slight central depression; length 4.00, maximum width 3.48, minimum width 1.20. Postlabial sigillum deep, posterior sigilla shallow and well defined, distant to the margin. Abdomen: Length 8.04, globose, covered by thin bristles. PMS: length 0.60; PLS: length of basal:medial:apical segments 0.80:0.36:0.16. Spigots: 2 large, 25 small on PMS; PLS, numbers of large(small) spigots on basal:medial:apical article 5(28):6(37):2(72). Lengths of legs and palp: I: 3.12, 1.80, 1.44, 1.80, 0.96, 9.12. II: 3.30, 1.80, 1.44, 1.92, 0.96, 9.42. III: 3.12, 2.40, 1.08, 2.10, 0.90, 9.60. IV: 3.90, 2.40, 2.40, 2.70, 0.96, 12.36. Palp: 3.00, 1.80, 1.92, –, 1.92, 8.64.

Chaetotaxy: All femora, 0. Patellae: I, 1 V A POST; II, 0; III, 1-3-3-4 P (1:2 A) +11 on the margin, 21 R A +12 on the margin; IV, 36 P SUP-D ANT; palp, 1-1-1 P, 1 V POST. Tibiae: I, 2-1-1 P, 13 R INF, 1-1 V POST; II, 81 R INF (3:4 A), 1-1-1 V POST; III, 1 D B, with a crown of 21 thorns and 3 apical (at the apex, anterior to the crown), 47 R; IV, 0; palp, 12 P INF, 21 R INF, 1-1 V POST. Metatarsi: I, 19 P INF, 17 R INF, 1-1-2 V POST; II, 22 P INF, 18 R INF, 1-1-2 V POST; III, 3-2-2-1-1-1- 1-1-1-3 D ANT, 52 on row D POST-R (more abundant R A), 1-1-1-2-4 V; IV, 11 P, 1 D A ANT, 1-2-1 V ANT (1:3 A). Tarsi: I, 1-2-2-1-1-1 P INF, 14 R INF, 2 V A; II, 13 P INF, 13 R INF, 1-2-2 V (1:2 A)/2 V A; III, 28 R, 75 V-P; IV, 45 V-P; palp, 16 P INF, 19 R INF, 2 V A. Total number of retrolateral spines on tibiae I and II (fig. 33B): 13 and 81 respectively. Trichobothria: Tibiae: I-II 4-5; III 5-6; IV 5-5. Metatarsi: I-IV 10. Tarsi: I 8; II 9; III 8; IV 7. Color: Carapace and cephalic region reddish brown, fovea dark; a central spot on the OQ lighter. Chelicerae with internal dorsal light bands. Abdomen brown, booklungs with light markings. Spinnerets lighter brown. Sternum light reddish brown; labium and maxillae darker. Legs like carapace.

DISTRIBUTION: Province of Misiones.

OTHER MATERIAL EXAMINED: Misiones. Parque provincial Urugua-í, R.P. 19, Cañadón cerca del Urugua-í [25°41′ S 54°8′ W], 16 Nov. 1992, P. Goloboff, 1♀ (MACN-Ar 27103).Yacupoi a 30 km de Puerto Bemberg, Arroyo Uruguaí [25°55′ S 54°17′ W], 6 Feb. 1951, J. Cranwell (Bachmann, A.), 1♀ (MACN-Ar 3330). Posadas [27°22′ S 55°54′ W], no date of collection, A. García, 2♀ (MACN-Ar 27115). Ruta 7, 3 km O de Aristóbulo del Valle [27°5′ S 54°55′ W], 21 Nov. 1992, P. Goloboff, 1♀ (MACN-Ar 28413).