Lobizon otamendi Piacentini & Grismado, 2009, sp. nov.
Creators: name: Piacentini, Luis N.
name: Grismado, Cristian J.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Lycosidae
Lobizon
Lobizon otamendi

description: Lobizon otamendi sp. nov.
(Figs 59–68, 86)
Type material. Male holotype (MACN-Ar 16309) and female paratype (MACN-Ar 16307) from Argentina: Buenos Aires Province, Department of Campana, Reserva Natural Otamendi, ca. 34°13'S, 58°54'W, pitfall in dense “chilcal” (Baccharis sp.), 9.I.1998, B. Fuentes & O. Di Iorio coll.
Other material examined. ARGENTINA: Buenos Aires: Reserva Natural Otamendi, Estación Río Luján, halophilous grassland of “pelo de chancho” (Distichlis sp.), pitfall trap, 34°16´43.4"S, 58°53´16.2"W, alt. 6m, 3–17.XI.2007, Grismado C., Damer L., López N., Trivero S. & Grismado A., 1 female (MACN-Ar 12123); Caseros, ca. 34°36’S, 58°33’W, 6.XII.1946, Partridge W. 1 female (MACN-Ar 16308).
Diagnosis. Lobizon otamendi sp. nov. is in the morphology of the male genitalia very similar to L. humilis, but differs by the larger peaked protrusion on the retrolateral tegular lobe and by the curved profile of the cymbium in retrolateral view (Figs 67–68). The retrolateral patch of setae on the palpal femur is much less dense than in the other Lobizon species. The epigyne is similar to that of L. corondaensis in the shape of the polygonal median field, but the copulatory ducts are shorter, the base of spermathecae is larger and the vulval chambers are elongated, laterally directed (Figs 65–66). This species is the smallest in the genus, and shows a contrasting dichromatic pattern on the opisthosoma (grey dorsally, pale yellowish ventrally) and proportionately reduced eyes (Figs 59–64).
Description. Male (holotype). Dorsal shield of prosoma brown with grey radial pattern, broad pale brown marginal bands. Dorsal shield of prosoma covered with short brown setae, median band with few long black bristles from the fovea to the PLE; four long black bristles on the clypeal condyle in front to AER. Sternum yellow; sparsely covered with brown bristles, more abundant on the margins. Labium dark grey. Chelicerae darker than labium, reddish-brown; covered with brown bristles. Dorsum of opisthosoma with dark olive-grey central band with sparse light patches; sides and venter yellow; spinnerets yellow. Leg femora yellow, all other segments brown, without annulations. Leg formula IV> I> III> II. Spination of leg I: femur, three dorsal, one apico-prolateral, three ventral pairs, two prolaterals (one in the middle, the other apical); metatarsus, three ventral pairs. Palp with a patch of sparse bristles on venter of femur, cymbium with two strong macrosetae. Cymbium with sinuous outline in lateral view; short embolus of apico-prolateral origin; tegulum subdivided, the retrolateral tegular lobe has a very conspicuous peaked projection (Figs 67–68); terminal apophysis short with the terminal part slightly curved retrodorsally; median apophysis small and laminar, oriented longitudinally. The sperm duct runs ventrally from retrolateral to prolateral, and makes a loop in the retroventral side of the tegulum.
Female (paratype). Colouration and setae arrangement as in male. Leg formula IV> I> III> II. Spination of leg I: femur, three dorsal, one apico-prolateral; tibia, two ventral pairs; metatarsus, three ventral pairs. Epigyne with a polygonal median field, short copulatory ducts; base of spermathecae large, vulval chambers elongated, directed laterally (Figs 65–66).
Measurements. Female, paratype (male, holotype): TL 3.97 (2.87), PL 1.90 (1.47), PW 1.33 (2.07), PH 0.63 (0.43), OL 2.07 (1.40). Eyes: AME 0.08 (0.06), ALE 0.06 (0.04), PME 0.12 (0.11), PLE 0.09 (0.07). Row of eyes: AM 0.39 (0.28), PME 0.38 (0.30), PLE 0.50 (0.40). Sternum (length/width) 0.97/0.77 (0.80/ 0.63). Labium (length/width) 0.22/0.29 (0.18/0.21). Legs: length of segments (femur + patella/tibia + metatarsus + tarsus = total length): Pedipalp 0.63 + 0.43 + - + 0.47 = 1.53, I 1.27 + 1.67 + 0.97 + 0.53 = 4.44, II 1.30 + 1.50 + 1.00 + 0.57 = 4.37, III 1.27 + 1.50 + 1.03 + 0.50 = 4.30, IV 1.70 + 2.20 + 1.77 + 0.83 = 6.50 (Pedipalp 0.47 + 0.23 + - + 0.40 = 1.10, I 0.97 + 1.33 + 0.80 + 0.57 = 3.67, II 0.97 + 1.20 + 0.63 + 0.50 = 3.30, III 0.90 + 1.17 + 0.83 + 0.43 = 3.33, IV 1.17 + 1.60 + 1.30 + 0.63 = 4.70.
Variation. Females (males) (range, mean±s.d.): TL 1.63 – 3.97, 3.72±0.36; CL 1.83 – 1.90, 1.87±0.05; CW 1.33 – 1.37, 1.35±0.03; n = 2 (TL 2.87 – 3.43, 3.15±0.40; CL 1.47 – 1.83, 1.65±0.25; CW 1.07 – 1.50, 1.29±0.31; n = 2).
Etymology. The specific epithet is a noun in apposition referring to the type locality.
Natural history. The specimens from the type locality were caught in pitfall traps in grassland and in “chilcal” of Baccharis sp. (Asteraceae).
Distribution. Only known from two localities in northeastern Buenos Aires: the Reserva Natural Otamendi and Caseros (Buenos Aires metropolitan area) (Fig. 86).
description: Published as part of Piacentini, Luis N. & Grismado, Cristian J., 2009, Lobizon and Navira, two new genera of wolf spiders from Argentina (Araneae: Lycosidae), pp. 1-33 in Zootaxa 2195 on pages 21-24, DOI: 10.5281/zenodo.189469