Actinopus palmar, 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 : 53-55

Actinopus palmar , sp. nov.

Figures 26A–G, 45

TYPE MATERIAL: HOLOTYPE ♂ (MACN-Ar

19826): Entre Ríos: Parque Nacional “El Palmar”

[31°51′ S 58°19′ W], 12–16 Feb. 1980, P. Grosso and P. Goloboff, 1♂.

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

DIAGNOSIS: Males of Actinopus palmar can be distinguished from those of all other Argentinian species by their copulatory bulb with a welldeveloped paraembolic apophysis (fig. 26D–F).

Female: Unknown

DESCRIPTION: Holotype male (MACN-Ar 19826, fig. 26A–G): Total length: 8.40. Carapace (fig. 26A): length 4.20, width 3.72. Cephalic region: length 2.40, width 2.76; clypeus short with a large central bristle and numerous to the sides; 9 bristles between PME and 3–4 behind each PME-PLE dyad; 6 bristles to the sides of the OQ, a central larger. Fovea: length 1.28, width 0.68. Eyes, diameters and interdistances: AME 0.16, ALE 0.24, PME 0.16, PLE 0.16, OQ length 0.60, anterior width 1.72, posterior width 1.52; AME- ALE 0.40, PME-PLE 0.08, AME-PME 0.20, ALE- PLE 0.28, AME-AME 0.16. Chelicerae: Length 2.40, width 1.00; cheliceral apex with 10 recumbent and elongated bristles which cover the base of the fang. Rastellum with 8 marginal, blunt cusps, and 2–3 small dorsal ones; fang groove with 3/4 large promarginal teeth and 5 retromarginal and 8 denticles, near the promarginal teeth. Labium: length 0.64, width 0.80. Maxillae: superior length 1.00, inferior length 1.68, width 1.08. Sternum (fig. 26G): Center flat; length 2.88, maximum width 2.16, minimum width 0.80. Postlabial sigillum shallow, posterior sigilla poorly defined. Abdomen: Length 4.44, median with dark bristles, larger on dorsum. PMS: length 1.08; PLS: length of basal:medial:apical segments 1.56:1.08:0.48. Spigots: 1 large, 18 small on PMS; PLS, numbers of large(small) spigots on basal:medial:apical article 2(23):4(33):2(39). Lengths of legs and palp: I: 2.52, 1.04, 1.44, 1.88, 1.08, 7.96. II: 2.40, 1.00, 1.44, 1.88, 1.08, 7.80. III: 1.80, 1.00, 1.00, 1.76, 1.12, 6.68. IV: 2.40, 1.04, 1.80, 1.92, 1.16, 8.32. Palp: 2.88, 1.16, 2.64, –, 0.64, 7.32.

Chaetotaxy: Femora: I-II-IV, 0; III, 1-2-2-1-2- 2-2 d. Patellae: I, 0; II, 1 V POST; III, 12 P SUP-D ANT, +9 on the margin, 2 R A +7 on the margin; IV, 38 P SUP-D ANT +3 near the edge. Tibiae: I, 1-1-1-1-1-1-1-1-1 R INF, 1-1-2-1-2-4 V; II, 1-1-1- 2-2-2-1-2-3 R INF, 1-2-1-2-1-1-4 V; III, 1 D B, 2-1- 1-3 V, with an apical crown of 14 thorns; IV, 2-2-2-4 V. Metatarsi: I, 1-2-1-2-1-2-1-2-3-1-2 R INF, 1-1-1- 1-1-2-2-2 V; II, 1-1-2-2-2-1-1-3-2 R INF, 2-2-2-1- 1-3 V; III, 1-1-1-1-1 D ANT, 1-1-1-4 on row D POST—R, 1-1-2-3 V; IV, 1-1-2-2-2 P, 2 V A. Tarsi: I, 1-1-1-1 P INF, 1-2-1-2-2-3-2-1-2-6 R INF, 1-1-2- 1-1 V; II, 1-1-1-2-1-2 P INF, 1-2-3-2-3-4-3-4-5 R INF, 1-1-2-1-2 V; III, 1-1-2-1-4 P INF, 1-2-2 R INF; IV, 2-2-3-3-2-2 P INF, 1-1-1-1-1 R INF. Total number of retrolateral spines on tibiae I and II (fig. 26B): 9 and 15 respectively. Palp: tibia long and slender (width/length: 0.29±0.01) (fig. 26C); copulatory bulb (fig. 26D-F) with ATA and BTA well developed, embolus with small MRk and a series of denticles at the base, with well-developed PA. Pseudoscopula: Tarsi: I-II sparse (3:4 A); III-IV, dense and uniform; Metatarsi: without pseudoscopula. Trichobothria: Tibiae: I 4-4; II 4-5; III 4-7; IV 5-6. Metatarsi: I-II 7; III 5; IV 6. Tarsi: I 9; II-IV 6. Color: Carapace reddish brown, abdomen dark brown, booklungs with dark markings. Spinnerets yellowish. Legs like carapace with tarsi-metatarsi-tibiae lighter; palp tibia light.

DISTRIBUTION: Only from the type locality.

ADDITIONAL MATERIAL EXAMINED: None.