Lobizon corondaensis Mello-Leitao 1941, comb. 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 corondaensis

description: Lobizon corondaensis (Mello-Leitão, 1941) comb. nov.
(Figs 2, 3–5, 9–10, 15–32, 83)
Pardosa corondaensis Mello-Leitão 1941: 209, fig. 10; female holotype from Argentina, Santa Fe, Coronda, M. Birabén, in MLP 15092, examined.
Pardosella corondaensis.- Roewer 1955: 196.
Alopecosa anomala Mello-Leitão 1945: 246, fig. 29; female holotype from Argentina, Misiones, San Ignacio, deposited in MLP 16450, examined. New synonymy.
Trochosippa anomala.- Roewer 1955: 303.
Other material examined. ARGENTINA: Jujuy: Parque Nacional Calilegua, Aguas Negras, 1100 m, 5– 7.VIII.1997, Ramírez M. & Compagnucci L., 1 female, 2 immatures (MACN-Ar 16213); same data, 1 female, 3 immatures (MACN-Ar 16215); same locality, 23°45’43.3”S, 64°51’04.7”W (+/- 10 m., WGS84), 605 m, 06–11.XII.2008, Grismado C., Izquierdo M., Labarque F., Rubio G., Burger M., Michalik P., Carrera P., Ojanguren A. & Mattoni C., nocturnal hand collecting, 3 males, 2 females (MACN-Ar 18325); same data, 1 female (MACN-Ar 18326); same locality, Sendero "La Herradura" 23°45’25.6”S, 64°51’04.7”W, 27.I.2009, Izquierdo M., Zapata L. & Akmentins M., diurnal hand collecting, 1 female (MACN-Ar 18327). Salta: Finca Jakulica, 25 km NO Aguas Blancas, ca. 23°12’S, 63°26’W, 15.XI.1994 Ramírez M. & Goloboff P. A., 3 females (MACN-Ar 16217); Aguas Blancas, ca. 23°24’S, 63°18’W, XI.1967 Galiano M. E., 1 female (MACN-Ar 16216). Mendoza: San Rafael: Camping Rayuela, 34°47’41.31”S, 69°27’01.49”W, 04– 11.II.2008, Piacentini L. & Fernandez C., 1 male. Chaco: Parque Nacional Chaco, Laguna Carpincho, 26°47’02.8”S, 59°37’41.2”W, alt. 70 m., Grismado C., Compagnucci L. & Galvani G., 11–13.XI.2007, sifting litter in forest, 5 males, 6 females, 2 inmmatures (MACN-Ar 13618); same locality, 26.II.2004, Grismado C., Ojanguren A., Labarque F. & Compagnucci L., 1 female (MACN-Ar 16235). Misiones: Parque Provincial Urugua-í, Sendero Dr. Rolón, ca. 25°49’S, 54°01’W, 10.XII.1999, Szumik C., Chalup & Winkler, 1 male (MACN-Ar 16229); same locality and collectors, 11.XII.1999, 1 female (MACN-Ar 16228); same locality and collectors, no date, 1 female (MACN-Ar 16230). Corrientes: San Cayetano, Estación Biológica de Corrientes (EBCo), 27°33’03.9”S, 58°40’40.2”W, alt. 48 m, Grismado C., Piacentini L., Izquierdo M., Compagnucci L. & Martínez J., 5–10.XI.2007; forest, under logs; Parque Nacional Mburucuyá (27°58’– 26°05”S, 57°59’– 58°08’W), specimens examined by Rubio et al. (2008, as Trochosippa anomala), 16 males, 7 females; Mburucuyá, ca. 27°29’S, 58°49’W, 15.XII. (year not given); Winkler, 1 female, 1 immature (MACN-Ar 16234). Santa Fe: Las Gamas, 20 km W Vera, ca. 29°25’S, 60°21’W, 27.X.1994, Ramírez M. & Faivovich J., 2 females, 1 immature (MACN-Ar 16218); Colonia Mascías, ca. 30°47’S, 60°01’W, XI.1942, Viana J. M., 2 females (MACN-Ar 16221). Entre Ríos: Arroyo Gualeyán y Ruta Nacional 14, near Gualeguaychú, ca. 33°00’S, 58°36’W, 2.XI.1996, Ramírez M., 1 male (MACN-Ar 16214). Buenos Aires: no precise locality, 1966, Pallares, 1 male (MACN-Ar 16223); Sierras de Olavarría, ca. 36°50’S, 60°13’W, 3– 6.XII.1992, Ramírez M., 1 male (MACN-Ar 16219); Río Luján, ca. 34°16’S, 58°54’W, 30.X.1990, Ramírez M., 1 male (MACN-Ar 16231); Otamendi, ca. 34°13'S, 58°54'W, 14.XII.1997, Fuentes B., 1 male (MACN-Ar 16224); Reserva Natural Otamendi, ca. 34°13’S, 58°54’W, 9.I.1998 Fuentes B. & di Iorio O., 1 male (MACN- Ar 16226), same locality and collectors, 15.XI.1997, 3 males (MACN-Ar 16227); locality and collectors, 25.X.1997, 1 male (MACN-Ar 16225); San Fernando, ca. 34°26'S, 58°33'W, XII.2002, Piacentini L., 3 females, 1 immature (MACN-Ar 16233); same data, 2 males (MACN-Ar 16222); Vuelta de Obligado, ca. 33°35’S, 59°48’W, VI.1974, Cesari C., 1 female (MACN-Ar 16232); Suipacha, ca. 34°46'S, 59°41'W, 23.XI.2003, Piacentini L., 1 male (MACN-Ar 16220).
Diagnosis. Males of L. corondaensis resemble those of L. ojangureni sp. nov. by the relatively broad palp with very long embolus arising apically, but differ by the less excavated tegulum, and by the embolus that is shorter than in L. ojangureni sp. nov. (Figs 23, 25, 26). The epigyne of females has an approximately quadrangular field (similar to that of L. otamendi sp. nov.), with a shallow septum (only evident in the SEM images, see Fig. 9) and sclerotised lateral margins, parallel or convergent anteriorly (see variability in Figs 21, 27–31). Internally, L. corondaensis vulvae also resemble those of L. ojangureni sp. nov., but the copulatory ducts are less convoluted (Figs 10, 22, 24).
Description. Female (MACN-Ar 13618).
Dorsal shield of prosoma brown with grey radial pattern, light median band narrowing posteriorly and pale submarginal 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 anterior of 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. Opisthosoma dark olive grey; light yellow lanceolate mark on the cardiac area, followed and flanked by a series of light patches, more abundant in the posterior half; venter yellow with some dusk patches; spinnerets yellow. Legs brown with dark annulations; leg formula IV> I> II> III. Spination of leg I: femur: three dorsal, one apico-prolateral; tibia: three ventral pairs; metatarsus: three ventral pairs. Epigyne with an approximately quadrangular median field with a shallow septum, only evident in the SEM images (Fig. 9) and more or less parallel, lateral, sclerotised margins, straight or convergent in the centre (see variability in Figs 21, 27–31). Internally with rounded median spermathecae, vulval chambers developed, same dimensions as spermathecae, copulatory ducts long, running ectally to the spermathecae (Figs 10, 22, 24).
Male (MACN-Ar 13618).
Colouration and setae arrangement as in female. Leg formula IV> I> II> III. Spination of leg I, femur: three dorsal, one apico-prolateral; tibia: three ventral pairs and one prolateral; metatarsus: three ventral pairs and two prolateral spines (one in the middle and one distal). Palp with a dense patch of retrolateral bristles on the femur. Bulb with a very long embolus with apical origin, tegulum subdivided, terminal apophysis long with apex strongly curved retrodorsally, median apophysis laminar and longitudinally oriented. The sperm duct runs ventrally from the retrolateral to prolateral, describing a loop in the ventral side of the tegulum (Figs 25–26).
Measurements. Female, MACN-AR 13618 (male,MACN-Ar 13618): TL 4.76 (3.63), PL 2.83 (2.00), PW 1.33 (1.47), PH 0.73 (0.70), OL 1.93 (1.63). Eyes: AME 0.09 (0.08), ALE 0.08 (0.06), PME 0.24 (0.31), PLE 0.18 (0.16). Row of eyes: AM 0.40 (0.38), PME 0.54 (0.54), PLE 0.64 (0.66). Sternum (length/width) 0.92/0.82 (0.97/0.83). Labium (length/width) 0.22/0.24 (0.67/0.77). Legs: length of segments (femur + patella/tibia + metatarsus + tarsus = total length): Pedipalp 0.70 + 0.60 + - + 0.53 = 1.83, I 1.23 + 1.70 + 0.93 + 0.63 = 4.49, II 1.23 + 1.57 + 0.93 + 0.57 = 4.30, III 1.20 + 1.40 + 1.00 + 0.60 = 4.20, IV 1.67 + 2.03 + 1.70 + 0.70 = 6.10 (Pedipalp 0.67 + 0.43 + - + 0.30 = 1.40, I 1.25 + 1.67 + 1.05 + 0.58 = 4.55, II 1.20 + 1.48 + 1.00 + 0.58 = 4.26, III 1.13 + 1.38 + 1.15 + 0.50 = 4.16, IV 1.63 + 2.17 + 1.78 + 0.75 = 6.33).
Variation. Female (male) (range, mean ±s.d.): TL 3.70 – 5.03, 4.36±0.46; CL 1.93 – 2.83, 2.32±0.32; CW 1.33 – 2.13, 1.63±0.27; n = 10 (TL 3.34 – 4.17, 3.75 ±0.27; CL 1.87 – 2.37, 2.05±0.15; CW 1.27 – 1.68, 1.44±0.11; n = 10). This species shows great variability in some genitalic and somatic characters. The lateral margins of the epigyne may be parallel, anteriorly convergent, or slightly curved, and the posterior lip may be conspicuous or shallow. This variability does not seem to be correlated to geographic distribution, because it occurs between specimens collected together in the same patch of leaf litter (Figs 27–31). Several males from Buenos Aires province have a conspicuous band of white setae on the anterior part of carapace (Fig. 32) and on the antero-dorsal section of the opisthosoma. These males have a less pronounced curvature in the ventral part of the sperm duct, visible by transparence in ventral view of the tegulum.
Synonymy. The types of P. corondaensis and A. anomala were compared and show no significant morphological differences.
Distribution. North-Central Argentina (Jujuy, Salta, Chaco, Misiones, Corrientes, Santa Fe, Entre Ríos, Mendoza and Buenos Aires Provinces) (Fig. 83).
Natural history. Most of the specimens recently collected by us in Chaco National Park and also in Corrientes were found sifting leaf litter in forests typical of the Wet Chaco biome. We also collected many specimens with the same method in the lower parts of Calilegua National Park. In the Yungas of the higher parts of Calilegua this species is replaced by L. ojangureni sp. nov. (see below). Rubio et al. (2008) reported that in the Mburucuyá National Park, Corrientes, this species (as Trochosippa anomala) is more abundant in the hygrophilous woodlands than in the neighboring grasslands.
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 6-12, DOI: 10.5281/zenodo.189469