Ariadna motumotirohiva, Giroti & Cotoras & Lazo & Brescovit, 2020

Giroti, André Marsola, Cotoras, Darko D., Lazo, Pedro & Brescovit, Antonio Domingos, 2020, First endemic arachnid from Isla Sala y Gómez (Motu Motiro Hiva), Chile: a new species of tube-dwelling spider (Araneae: Segestriidae), European Journal of Taxonomy 722, pp. 97-105: 99-102

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Ariadna motumotirohiva

sp. nov.

Ariadna motumotirohiva   sp. nov. Figs 1–3 View Fig View Fig View Fig

Segestriidae   sp. – Hershauer et al. 2020: 3, fig. 3b.


Females of Ariadna motumotirohiva   sp. nov. are similar to those of Ariadna perkinsi Simon, 1900   and Ariadna lebronneci Berland, 1933   due to the dark dorsal abdominal pattern ( Fig. 2A View Fig ; Giroti & Brescovit 2018: fig. 31a, e), but differ from the former by the anterior receptaculum with the dorsal lobe globous ( Fig. 3 View Fig ; Giroti & Brescovit, 2018: fig. 31i–j), by the presence of three promarginal teeth on the chelicerae and femur IV with dorsal macrosetae, and from the latter by four promarginal teeth (see Berland 1933: 44, figs 1–2).


The name refers to the name given by the Rapa Nui people to the type locality, 'Motu Motiro Hiva'; noun in apposition.

Type material


CHILE • ♀; V Región de Valparaíso, Isla Sala y Gómez ; 26°28′ S, 105°28′ W; Nov. 2012; P. Lazo leg.; MNHN ( MNHN 8366 View Materials ).



CHILE • ♀; V Región de Valparaíso; same collection data as for holotype; IBSP ( IBSP 246895 View Materials ) GoogleMaps   .


Female (holotype) (measurements in mm)

Carapace orange with cephalic region reddish orange; eyes bounded by dark outlines ( Fig. 2A View Fig ). Chelicerae, endites and labium dark reddish orange ( Fig. 2C View Fig ). Sternum light orange with darker margins, and four pairs of dark marginal areas ( Fig. 2B View Fig ). Palps brownish orange, gradually darkening distally ( Fig. 2B View Fig ). Legs brownish orange with pairs I–II darker, and metatarsi and tarsi I–II reddish orange ( Fig. 2 View Fig F–G). Abdomen whitish grey, with a fainted dark dorsal pattern comprising arrow-shaped marks ( Fig. 2 View Fig A–B). Total length 13.36; carapace 6.4 long, 3.76 wide. Carapace oblong, cephalic region narrower than thoracic region, with short setae conspicuously delimiting it. Six indirect eyes, with the posterior ones in a slightly recurved line ( Fig. 2A View Fig ). Chelicerae conical, wider basally, with frontal setae ( Fig. 2A, C View Fig ); chelicerae with one retromarginal and three promarginal teeth. Endites spatulate, narrowed medially, rounded distally and proximally. Labium longer than wide, with a narrowed distal region. Labrum well developed, longer than the labium ( Fig. 2C View Fig ). Palps short and robust, with one diaxially orientated articulated claw; tarsi and tibia with prolateral setae. Legs robust, pair III directed forward ( Fig. 2 View Fig A–B, F–G). Leg formula: I-IV-II-III. Leg measurements: I, femur 4.48, patella 2.2, tibia 4.4, metatarsus 3.32, tarsus 0.72, total 15.12; II, 3.88, 2.08, 4.12, 3.04, 0.64, 13.76; III, 3.28, 1.76, 2.64, 2.52, 0.8, 11.0; IV, 4.32, 2.16, 3.6, 3.2, 0.8, 14.08. Macrosetae: I, femur d0-0-0-0-0-0/1-1-2/1-0, p0-0-0-0-1-2-1/0-1-0; tibia vp1-1-0-1/0-1-1-0-1-1-0, vr1-1-1-0-1-1-0-1-1-1-0, r0-0-1-0-0-0-0-0; metatarsus vp1-1-1-1-0/1-1- 1-1-1-1-1-0/1-0/1-1, vr1-0-1-1-0-1-1-0-1-1-1-1; II, femur d0-0-1-1-1-2-0-2-0, p0-0-0-0-0-1-0-1-0; tibia p0-1-0-1/0-1/0-0-0-0-0-0, vp1-1-1-1-1/0-1-0-1/0-1-0, vr1/2-1-1-0-1-1-0-1-1/0-0/1-1-0, r0-0-0-1/0-1/0- 0-0-0-0; metatarsus vp1-1-1-0/1-1-1-1-1-1-1-1, vr1-0-1-1-0-1-0-1-1-0-1; IV, femur d0-1-1-1-0-1/0-1/0- 0-0-0, r0-0-0-0-0-0-0-1-0-0; metatarsus vr metatarsal comb with 3 macrosetae. Abdomen membranous, longer than wide, uniformly hairy; epigastric genital plate sclerotized; tracheal system dysderoid like, with the tracheal openings positioned near the epigastric furrow ( Fig. 2 View Fig A–B, D). Six spinnerets, ALS with three segments, the basal one crossed by a diagonal membranous band; PLS with distal external sclerite equally sclerotized; colulus distinct and pilose ( Fig. 2E View Fig ). Internal female genitalia with anterior receptaculum billobulated, dorsal lobe conspicuously longer than the ventral one, with median and ventral projections; glandular ducts plate medianly positioned; interpulmonary fold with the dorsal margin sclerotized, and a median membranous crack; posterior receptaculum membranous, with tubular invaginations ( Fig. 3 View Fig ).


Female (n = 2): total length 10.8–13.36; carapace 5.92–6.4 long, 3.44–3.76 wide; femur I 3.76–4.48.


For comparison we used the female specimen of A. perkinsi   described by Giroti & Brescovit (2018) (IBSP 209056) and the original description and illustrations provided by Berland (1933: 44) of A. lebronneci   .


Only known from the type locality ( Fig. 1 View Fig ).


Brazil,Sao Paulo, Sao Paulo, Instituto Butantan


Royal British Columbia Museum - Herbarium


Museum National d'Histoire Naturelle


Instituto Biologico de Sao Paulo














Ariadna motumotirohiva

Giroti, André Marsola, Cotoras, Darko D., Lazo, Pedro & Brescovit, Antonio Domingos 2020


Hershauer S. N. & Yancovic Pakarati S. & Wynne J. J. 2020: 3