Mediothele linares, T, Duniesky Rios & Goloboff, Pablo A., 2012

T, Duniesky Rios & Goloboff, Pablo A., 2012, New species of Chilean Hexathelidae (Araneae, Mygalomorphae), Zootaxa 3422, pp. 32-51 : 44-45

Mediothele linares sp. nov.

Figures 39–46

Type. Female Holotype (6810 MNHN) from El Peñasco, 21 km. E. Linares [36° 1'35"S 71°32'48"W], Linares , Chile, Jan. 1984 (P. Goloboff).

Etymology. The specific name is a noun in apposition taken from the type locality.

Diagnosis. Females of M. linares can be distinguished from those of all other species by the narrower and more elevated pars cephalica, the spermathecae with very short ducts, and the spination of the forelegs. From M. minima , they can also be distinguished by the thinner and more elongated tarsi and metatarsi I. From M. lagos and M. nahuelbuta , they can also be distinguished by the wider sternum.

Female (Holotype). Total body length 6.00; cephalothorax very narrow, and arched; length 2.28, width 1.68. Cephalic region length 1.56; width 1.44. ALE largest, both eye rows recurved, with 5 setae before ocular group and 3 behind. Fovea straight; dorsal midline of cephalothorax with series of 6–7 setae reaching fovea. Both sides of cephalic region with dark elongated S-shaped marks. Chelicerae with rastellum-like thick setae on anterior edge; with 7 large promarginal teeth and ca. 12 denticles irregularly placed in basal part of fang furrow. Palpal coxae with 2–4 cuspules. Labium length 0.24, width 0.52, without cuspules, and ca. 20 bristles on anterior margin. Sternum wide and rounded, 1.40 long, 1.04 wide; with three pairs of small sigilla. Opisthosoma length 3.00; light brown, with transverse bands forming chevron interrupted centrally. PLS with basal: medial: apical articles of lengths 0.40: 0.24: 0.28; PMS monoarticulate, length 0.36; ALS biarticulate, basal article 0.12 long, apical article very small and sharp, 0.04 long, with 2 spigots. Tarsi I long, length 0.52, width 0.20, metatarsi I 0.88 long. Chaetotaxy: All femora with series of dorsal setae along midline. Patellae, tibiae, and metatarsi III with many small thick p and d setae. Patellae: I–II, IV, 0; III, 0–1–3 P; palp, 1 P A INF. Tibiae: I, 1–1– 1 V POST; II, 1–1– 1 V POST; III, 1 R A, 1 D B, 1–1 P, 1 P A INF; IV, 1–1– 1 V ANT (thin); palp, 1–1– 2 V POST; 1–1– 2 V ANT. Metatarsi: I, 0–1– 1 V ANT, 1–1– 2 V POST, with apical preening comb (of 3 bristles); II, 1 V A ANT, 1–1– 1 V POST, with apical preening comb (of 3 bristles); III, 1 V A ANT, 1 V A POST, 0–1–1 P SUP, 0–1–1 R SUP, with 2 apical preening combs (of 5–4 bristles); IV, 0–1–0–1 P SUP, 0–1– 1 V ANT, 1–1 R SUP, with apical preening comb (of 5 bristles). Tarsi: I, 1 R INF; II, 1–1–1 R; III–IV, 0; palp, 0–1–1–1–1 P, 0–1–1–1 R INF. Trichobothria: all tarsi with 4; metatarsi I, II, IV with 4, III with 5; all tibiae with two rows of 4.

Male. Unknown

Distribution. Region VII (del Maule), province of Curicó and Region VIII (del Bio–Bio), province of Ñuble.

Other specimens examined. Chile: Region VII (del Maule). Linares . El Peñasco, 21 km. E. Linares [36° 1'35"S 71°32'48"W], Jan. 1984 (P. Goloboff) 4 Ƥ ( MACN) 1Ƥ ( AMNH). Curicó: Los Queñes, 5 km –O– [35° 0'15"S 70°52'6"W], Jan. 1984, (P. Goloboff), 5 Ƥ ( MACN). Linares : El Peñasco (21 km. SE. Linares ~ 200m) [36° 1'35"S 71°32'48"W], 8 Feb 1992 (P. Goloboff – N. Platnick – M. Ramírez) 1 juv ( MACN). Region VIII (del Bio–Bio): Ñuble: 4,5 km, E. San Fabián (E. San Carlos). 820 m [36°34'8"S 71°30'13"W], 24 Feb 1990, (P. Goloboff – N. Platnick – M. Ramírez) 2 Ƥ ( MACN).

Figures

FIGURES 39 – 46. Mediothele linares sp. nov., female. 39 – 46. Right leg I, retrolateral and ventral views. 41. Sternum and maxillae. 42 – 43. Cephalothorax. 44 – 45. Spinnerets. 46. Spermathecae.