Actinopus indiamuerta, Ríos-Tamayo & Goloboff, 2018

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 : 43-45

Actinopus indiamuerta , sp. nov.

Figures 20A–D, 44

TYPE MATERIAL: HOLOTYPE ♀ (MACN-Ar 36626): Tucumán : Río India Muerta, Ruta 9 [26°32′ S 65°15′ W], Sep. 1994, P. Goloboff, 1♀.

ETYMOLOGY: The specific name is a noun in apposition that refers to the type locality.

DIAGNOSIS: Females of A. indiamuerta can be distinguished by their short spermathecae with an external lobe projected perpendicularly to the base (fig. 20D), and the wide labium, semicircular with few cuspules (fig. 20B). It also differs from all other species (except A. gerschiapelliarum ) by the lower number of retrolateral spines on tibia II (fig. 20C).

Male: Unknown.

DESCRIPTION: Holotype female (MACN-Ar 36626, fig. 20A–D): Total length: 17.64. Carapace (fig. 20A): length 5.40, width 4.74, 25 bristles on each posterior margin. Cephalic region: length 2.70, width 4.38, clypeus with 35 small bristles and a large central one; chilum with 35 small bristles, 6–8 between AME-ALE, 12 bristles between PME; numerous bristles behind each PME-PLE and on each side of the OQ. Fovea: length 1.02, width 2.52. Eyes, diameters and interdistances: AME 0.16, ALE 0.36, PME 0.24, PLE 0.24, AME-ALE 0.84, PME-PLE 0.08, AME-PME 0.48, ALE-PLE 0.60, AME-AME 0.28, OQ length 1.28, anterior width 3.68, 3.56 posterior width. Chelicerae: Length 2.70; width 1.98; cheliceral apex with 15 recumbent and elongated bristles that cover the base of the fang. Rastellum with 9 marginal, blunt cusps, and 12 small dorsal ones; cheliceral furrow with 6 promarginal teeth; 6 retromarginal (a small one between 5th-6th) and 9 denticles, near the promarginal teeth. Labium: length 0.96, width 1.14, semicircular with 5 anterior cuspules. Maxillae: anterior length 1.50, posterior length 1.98, width 1.38, with +120 cuspules 1:3 V ANT, extending to the anterior face. Sternum (fig. 20B): Center flat; length 3.84, maximum width 3.00, minimum width 1.14. Postlabial sigillum deep, posterior sigilla shallow and well defined. Abdomen: Length 9.12, globose, covered with small bristles. PMS: length 0.72; PLS: length of basal:medial:apical segments 0.96:0.44:0.36. Spigots: 3 large, 16 small on PMS; PLS, numbers of large(small) spigots on basal:medial:apical article 5(18):6(25):4(45). Lengths of legs and palp: I: 3.00, 1.92, 1.32, 1.68, 0.90, 8.82. II: 3.00, 1.92, 1.32, 1.80, 0.84, 8.88. III: 2.70, 2.22, 0.90, 1.92, 0.72, 8.46. IV: 3.60, 2.40, 2.16, 0.78, 11.10. Palp: 2.70, 1.92, 1.98, –, 2.04, 8.64.

Chaetotaxy: Femora: 0. Patellae: I-II, 0; III, 1 P A, +8 on the margin, 12 R (1:2 A) +11 on the margin; IV, 64 P SUP-D ANT, palp, 1- 1 P. Tibiae : I, 1-1-2 R INF ; 1-1 V POST; II, 36 R (3:4 A), 1-1- 1-1 V POST; III, 1 D BAS, 26 R (3:4 A), with an apical crown of 19 thorns; IV, 0; palp, 7 P, 14 R INF. Metatarsi : I, 17 P INF, 16 R INF, 1-1-2 V POST ; II, 9 P INF, 14 R INF, 1-1-2 V POST; III, 36 on row D POST-R (more abundant R Al), 19 D ANT, 1 V A ; IV, 1-3-2-3 R INF, 1 D A ANT. Tarsi : I, 10 P INF, 20 R INF, 3 V A ; II, 12 P INF, 26 R INF (more abundant A), 2 V A; III, 27 R, 38 V-P; IV, 44 V-P; palp, 10 P INF, 20 R INF, 3 V A. Total number of retrolateral spines on tibiae I and II (fig. 20C): 4 and 36 respectively. Trichobothria: Tibiae: I 5-5 ; II 4-6 ; III 3-5 ; IV 7-7 . Metatarsi : I 11 ; II 10 ; III-IV 8. Tarsi: I 9; II-III 8; IV 7 . Color: Carapace light reddish brown, chelicerae light with two dorsal light bands and a mottled of dark spots. Abdomen brown ; booklungs with light markings. Sternum light reddish brown, labium and maxillae darker. Spinnerets yellowish. Legs like carapace .

DISTRIBUTION: Only the type locality.

OTHER MATERIAL EXAMINED: Same data and collector, 1 immature (MACN-Ar 36627).