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

publication ID

https://doi.org/10.5852/ejt.2020.722.1137

publication LSID

lsid:zoobank.org:pub:53BAF573-E87C-4636-BE6E-9436CCDA8489

persistent identifier

http://treatment.plazi.org/id/BC432E25-E52D-4E0B-896D-0BDCE97BD2D4

taxon LSID

lsid:zoobank.org:act:BC432E25-E52D-4E0B-896D-0BDCE97BD2D4

treatment provided by

Valdenar

scientific name

Ariadna motumotirohiva
status

sp. nov.

Ariadna motumotirohiva   sp. nov.

urn:lsid:zoobank.org:act:BC432E25-E52D-4E0B-896D-0BDCE97BD2D4 Figs 1–3 View Fig View Fig View Fig

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

Diagnosis

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).

Etymology

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

Type material

Holotype

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 ).

GoogleMaps  

Paratype

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

Description

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 ).

Variation

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.

Note

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   .

Distribution

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

IBSP

Brazil,Sao Paulo, Sao Paulo, Instituto Butantan

V

Royal British Columbia Museum - Herbarium

MNHN

Museum National d'Histoire Naturelle

IBSP

Instituto Biologico de Sao Paulo

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Segestriidae

Genus

Ariadna

Loc

Ariadna motumotirohiva

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

Segestriidae

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