Ariadna lalen Giroti & Brescovit 2018, new species
Creators: name: Giroti, André Marsola
name: Brescovit, Antonio Domingos
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Segestriidae
Ariadna
Ariadna lalen

description: Ariadna lalen new species
Figures 62‒63, 70
Ariadna araucana — Grismado (2008: 347, figs 7A‒C) (only ♂), misidentification).
Type-material. ♂ holotype from Reserva Nacional Los Ruiles, elev. 174m (35°50'02,6"S; 72°30'35,7"W), Cauquenes, Cauquenes Province, VII Región de Maule, Chile, 17.VII.2010, A. Ojanguren et al. leg., deposited in MACN-Ar 29457. Paratypes: 1♂ from Contulmo Natural Monument [38°01'55"S; 73°04'22"W], Purén, Malleco, IX Región de Araucanía, Chile, 11.XII.1984 ‒ 13.II.1985, S. & J. Peck leg. (AMNH); 1♀ 2imm. from Estación Biológica de Hualpén, 10m, Concepción, VIII Región de Bío-Bío, Chile (36°47'51.2"S; 73°09'29.3"W), 15‒16.VII.2010, A. Ojanguren et al. leg. (MACN-Ar 29456); 3♀ 2imm. same data of the last (MACN-Ar 2 9454).
Notes. One male of this species was illustrated by Grismado (2008: 347, figs 7A‒C) as a male of A. araucana. After the examination of this specimen and comparing it with others from the same region of occurence, we assumed that it represents a new species, similar to A. araucana in the habitus and leg macrosetae pattern, but with differences in the male and female genitalia. Grismado (2008: 353) stated that the vial labeled as “ longipes ” from “Pissis”, anteriorly recognized as one of the types of Dysdera longipes Nicolet, 1849 by Ramírez (1989) (MNHNP- AR 9069, anteriorly 4211), possess a female specimen that differs from the ones of the vial from Valdivia, with one male and two females (MNHNP-AR 9067, anteriorly 4133). Because of that, Grismado (2008: 353) designated the specimen from “Pissis” as a non-type Ariadna araucana, one of his new species. Here we identifiy this female specimen as Ariadna lalen n. sp., due to differences from A. araucana in the female genitalia.
Additional material examined. CHILE: VIII Región de Bío-Bío: Concepción Province: Hualpén [36°47'32"S; 73°05'44"W], 1♀, 11.I.1989, M. Ramírez leg. (MACN-Ar 10089); 1♀, E. Maury leg. (MACN-Ar 21348); Estação Ecológica Hualpén, 10m (36°47'51,2"S; 73°09'29,3"W), 1♀, 15‒16.VII.2010, A. Ojanguren et al. leg. (MACN-Ar 29462); " Pissis ", 1♀ (MNHNP-AR 9069); IX Región de Araucanía: Malleco Province: Monumento Natural Contulmo (38°00'46.8"S; 73°11'15"W), 2♀ 1imm., 19‒21.XII.1998, M. Ramírez et al. leg. (MACN-Ar 10094); 1♂, 10‒11.II.2005, M. Ramírez & F. Labarque leg. (MACN-Ar 10918).
Diagnosis. Ariadna lalen n. sp. is similar to A. araucana due to the presence of reduced mid-portion in the male palp, and females with leg formula II-I-IV-III and absence of the median membranous crack in the interpulmonary fold; males of Ariadna lalen n. sp. differ from those of A. araucana by the presence of a subrectangular bulb, less rounded than A. araucana, with mid-portion and embolus markedly bended and thickened (Fig. 63A‒B); females of A. lalen n. sp. differ from A. araucana by the anterior receptaculum, flattened laterally, with the dorsal region incrassated and rounded (Fig. 63C‒D).
Etymology. The specific name is a noun in apposition taken from the “Mapundungun”, the language spoken by the Mapuche people that live in Araucanía, and other regions of southern Chile and Argentina. It refers to the old legend of the Lalén Kuzé, la “Araña Vieja” (“ancient spider”), a mythological creature that appears to the Mapuche women in their dreams to teach the art of weaving.
Description. Male (Holotype). Carapace and chelicerae dark reddish brown, with cephalic region and chelicerae darker, almost black (Fig. 62A). Endites brown; labium dark brown. Sternum brown with darker margins, and four pairs of fainted dark marginal areas (Fig. 62B). Palps orange (Fig. 63A‒B). Legs brownish orange, with pairs I‒II darker (Fig. 62C‒E). Abdomen grey, lighter ventrally (Fig. 62A‒B). Total length 8.56; carapace 4.4 long, 3.2 wide. Carapace with cephalic region elevated. Carapace and chelicerae with a glazy appearance (Fig. 62A). Palps: tibia slightly incrassated, almost cilindrical, with the dorso-ventral diameter shorter than the bulb; cymbium with a dorsal chemosensory patch; bulb sub-rectangular, mid-portion reduced; embolus long, thickened and with a tubular hook-like tip (Fig. 63A‒B); legs slender, densely coated with setae, and with macrosetae of similar sizes (Fig. 62C‒E); tarsal brush of putative chemosensory setae present on legs I‒IV, but reduced. Leg formula: II-I-IV-III. Leg measurements: I, femur 4.48, patella 1.6, tibia 3.68, metatarsus 4.44, tarsus 1.52, total 15.72; II, 4.24, 1.68, 4.0, 4.48, 1.48, 15.88; III, 3.48, 1.44, 2.72, 3.2, 1.2, 12.04; IV, 3.56, 1.6, 2.96, 2.92, 1.12, 12.16. Macrosetae: I, femur D0-0-0-0-0-1-0, P0-0-0-0-2-0-0; tibia P0-1-0-1-0-1-0, vp1-1/0-1-0-1-0-1, vr1-1- 0-1-0/1-1-0-1, R0/1-1-0-1-0-1-1-0/1; metatarsus p0-1-0-0-0-0-0-0, vp1-0-1-0-1-1/0-1-1, vr1-0-1-0-1-1/0-1-1, r1-1- 0-0-0-0-0-0 (Fig. 62C‒E); II, femur D0-0-0-0-0-1-0, P0-0-0-0-0-1-0; tibia P0-0-0-1-0-1-0, vp0-0-0-0-1-0-1, vr0-1- 0/1-0-1-1-1, R0-1-0-1-0-1-0; metatarsus p1-0-0-1/0-0-0-0, vp0/1-0-0-1-0-1-1, vr1-0-1-0-1-0-1, r1-0-0-0-0-0-0; IV, femur D1-1-1-0-0-0-0; tibia V0-0-0-0-0-0-1, R0-0-0-0-0-1-0; metatarsus vp0-1/0-0-0-1-0-1, vr metatarsal comb with 6-7 macrosetae, the two lateral ones longer.
Female (Paratype—MACN-Ar 29456). Coloration of carapace and chelicerae as in male (Fig. 62F). Endites brownish orange; labium dark brownish orange. Sternum brownish orange, with darker margins, and four pairs of fainted dark marginal areas (Fig. 62G). Palps brownish orange, darkening gradually in distal direction (Fig. 62G). Legs brownish orange, with pairs I‒II darker and with dark pigment forming diffuse rings in the distal region of the tibia, metatarsus and tarsus (Fig. 62H‒I). Abdomen as in male (Fig. 62F‒G). Total length 15.6; carapace 5.92 long, 3.6 wide. Carapace with cephalic region elevated. Carapace and chelicerae with a glazy appearance (Fig. 62F). Legs: robust and densely coated with setae; legs I‒II with tibial ventro-prolateral and ventro-retrolateral macrosetae with similar sizes among themselves, and metatarsal ones also with similar sizes (Fig. 62H‒I). Leg formula: II-I-IV-III. Leg measurements: I, femur 3.88, patella 1.84, tibia 3.12, metatarsus 3.0, tarsus 1.04, total 12.88; II, 3.84, 1.92, 3.28, 3.04, 1.04, 13.12; III, 3.04, 1.64, 2.32, 2.44, 0.92, 10.36; IV, 3.6, 1.84, 2.76, 2.48, 0.88, 11.56. Macrosetae: I, femur P0-0-0-0-0-2/1-0; tibia vp1-0-1-0-1-0-0/1, vr1-0-1-0-1-0-1; metatarsus vp0-1-0-1-1-1- 1-1-1-1, vr0-1-0/1-0/1-1-1-1/0-1-1 (Fig. 62H‒I); II, femur P0-0-0-0-0-1-0; tibia P0-0-0-0-1-0, vp0-0-0-0-0-1, vr0- 1-0-1-0-1; metatarsus vp0-1-0-1-1-1-1-1-1, vr0-1-0-1/0-1-1-1-0-1; IV, femur D0-0/1-0/1-0-0-0-0; tibia vr0-0-0-0- 0-0-1; metatarsus p0-1-0-0-0-1-1, vp0-1-0-0-0-0-1, vr metatarsal comb with 7 macrosetae, the two lateral ones longer. Internal genitalia: interpulmonary fold without a median membranous crack; anterior receptaculum with irregular cuticle, hyaline cuticle, and glandular ducts plate located in the proximal region of it (Fig. 63C‒D).
Variation. Male (n=2): Total length 8.0‒8.56; carapace 3.72‒4.4 long, 2.64‒3.2 wide; femur I 3.52‒4.48. Female (n=6): Total length 10.72‒15.6; carapace 4.84‒5.92 long, 3.04‒3.6; femur I 3.16‒3.88.
Distribution. South of Chile (Fig. 70).
description: Published as part of Giroti, André Marsola & Brescovit, Antonio Domingos, 2018, The taxonomy of the American Ariadna Audouin (Araneae: Synspermiata: Segestriidae), pp. 1-114 in Zootaxa 4400 (1) on pages 98-101, DOI: 10.11646/zootaxa.4400.1.1, http://zenodo.org/record/1207641