Mediothele lagos, 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 : 47-49

Mediothele lagos sp. nov.

Figures 59–64

Type. Female Holotype (6813 MNHN) from Los Lagos , 6 km. E. Niebla [39°52'16"S 73°19'30"W], Valdivia , Chile. 16 Feb 1992 (P. Goloboff–N. Platnick–M. Ramírez).

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

Diagnosis. Females of M. lagos can be distinguished from those of all other species of the genus by the more elongated sternum, and from all other species except M. nahuelbuta , by the larger number of spines on metatarsi I and the straighter and more elongated spermathecae. It also differs from M. nahuelbuta by the slightly more elongated labium and the stronger, more numerous prolateral spines on metatarsi I.

Female (Holotype). Total body length 10.44. Cephalothorax length 3.96, width 3.00 Cephalic region length 2.64, width 2.40. ALE larger than rest, anterior ocular row straight, posterior recurved, with 8 thick setae before and 5 thick setae behind OQ. Fovea procurved, dorsal midline of cephalothorax with series of 11 setae reaching fovea. Chelicerae with rastellum-like thick setae on anterior edge; with 7 promarginal teeth and about 18 denticles irregularly placed in basal part of fang furrow. Palpal coxae with 3 cuspules. Labium length 0.40, width 0.76, without cuspules. Sternum length 2.24, width 1.88; with three pairs of small sigilla. Opisthosoma length 4.32 light brown, with transverse bands forming chevron interrupted in middle. PLS with basal: medial: apical articles of lengths 0.72: 0.36: 0.60; PMS monoarticulate, length 0.52; ALS biarticulate, basal article 0.20 long, apical short, of length 0.12, with 7–8 spigots. Tarsi I length 0.92, width 0.32, metatarsi I 1.40 long. Chaetotaxy: Patellae and tibiae III–IV, and metatarsi III, with many small spine like setae from P edge to dorsal midline; such setae less numerous on metatarsi IV. Femora, all with 1–1–1–1–1–1 d; palp, 1 p sup. Patellae: I–II and IV, 0; III, 0–1–2 P; palp, 1 P INF. Tibiae: I, 1–1– 1 V POST; II, 1–1– 1 V POST; III, 1 R A, 1 D B, 1 V A ANT, 1 V A POST (thin), 1–1–0 P SUP, 0– 1–1 P INF; IV, 1–1– 1 V ANT (thin); palp, 1–1– 2 V ANT, 1–1– 2 V POST, 1 P M. Metatarsi: I, 1–1–1– 1 V ANT, 1– 1– 1 V POST, 1–1–0–1 P SUP, 1–0–0– 1 V, with apical preening comb (of 2 bristles); II, 0–1– 1 V ANT, 1–0–0– 1 V, 1–1– 2 V POST, with 2 apical preening combs (of 3–5 bristles); III, 1–1– 1 V ANT, 0–1– 1 V POST, 1–1–1 P SUP, 0–1–0–1 R SUP, with 3 apical preening combs (of 5–2–4 bristles); IV, 0–1–0–1 R SUP, 1–1–0–1 P, 0–1–1–1– 1 V ANT, 1 V B, 1 V A POST, with 2 apical preening combs (of 3–5 bristles). Tarsi: I, 1 P B INF, 1–1–1–0 V POST; II, 1 P M INF, 1–1–0 R INF; III–IV, 0; palp, 1–1–1–1 P, 1–1–1–1 R, 1 V M. Trichobothria: Tarsi I, II, IV with 5, III with 3; metatarsi I–III with 6, IV with 9; all tibiae with two rows of 4.

Male. Unknown.

Distribution. Known only from the type locality.

Other specimens examined. Chile: Región X (los Lagos ): Valdivia : 6 km, E. Niebla [39°52'16"S 73°19'30"W], 16 Feb 1992 (P. Goloboff – N. Platnick – M. Ramírez) 2 Ƥ, 1 juv ( MACN).

Figures

FIGURES 59 – 64. Mediothele lagos sp. nov., female. 59 – 60. Right leg I, retrolateral and ventral views 61. Sternum and maxillae. 62 – 63. Spinnerets. 64. Spermathecae.