Idiops nilopolensis Mello-Leitao 1923
Creators: name: Fonseca-Ferreira, Rafael
name: Guadanucci, José Paulo Leite
name: Yamamoto, Flávio Uemori
name: Brescovit, Antonio Domingos
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Idiopidae
Idiops
Idiops nilopolensis

description: Idiops nilopolensis Mello-Leitão, 1923
Figs 3D, 24A–L
Idiops nilopolensis Mello-Leitão, 1923: 47.
Idiops nilopolensis – Bücherl et al. 1971: 121, figs 6–7. — Fukami & Lucas 2005: 7.
Diagnosis
Males of Idiops nilopolensis differ from those of other Neotropical species by the strong curvature of the median portion of the embolus in dorsal view (Fig. 24D–F; also present in I. fuscus). Differs from I. fuscus by having the embolus with a thickened basal half and by the small embolar lamella (smaller than in I. fuscus) close to spermatic duct opening (Fig. 24D–F). The female differs from those of other species by having the spermathecae with a translucent duct and without constriction between the duct and the sclerotized receptacles (Fig. 24L).
Type material
Holotype BRAZIL – Rio de Janeiro • ♀; Rio de Janeiro; Nov. 1923; H. Blanc de Freitas leg.; MNRJ 10. Lost before the 2018 fire (Moreira et al. 2010: 34).
Neotype (here designated) BRAZIL – Rio de Janeiro • ♂; Nova Iguaçu, Parque Municipal de Nova Iguaçu; 22°45′35′′ S, 43°27′6′′ W; 21 Jul. 2004; R. Baptista leg.; MNRJ.
Remark: The type specimen of Idiops nilopolensis was lost in the MNRJ long before the 2018 fire. In accordance with the criteria of the ICZN Code (ICZN 1999), a neotype is designated here, because the type is lost and the original description is inadequate to stabilise the species. This neotype is based on a specimen collected near the type locality, in the state of Rio de Janeiro, Brazil.
Other material examined
BRAZIL – Rio de Janeiro • 1 ♀; same locality as for neotype; 1 Nov. 2004; MNRJ.
Description
Male (neotype MNRJ)
HABITUS. See Fig. 24A.
MEASUREMENTS. TBL 16.9, CL 7.3, CW 6.4, LL 0.6, LW 1.2, SL 3.9, SW 3.5.
COLOR. Body uniformely light brown (Fig. 24A–B).
PROSOMA. Carapace and ocular arrangement as shown in Fig. 24A. Eye tubercle: 0.8 long; 1 wide. AME-ALE distance 0.9. Eye diameters: AME 0.4, ALE 0.4, PME 0.2, PLE 0.4. Thoracic fovea procurved (Fig. 24A). Labium and sternum without cuspules (Fig. 24B). Basal segment of chelicerae with a prolateral row of 7 large teeth and 3 small retrolateral teeth, grouped on basal half, rastellum with 16–18 spines, the distal ones longer.
LEGS. Tibia, metatarsus and tarsus I as shown in Fig. 20G. Leg I with double tibial apophysis. Apical branch twice the size of basal branch and with a conspicuous spine (Fig. 24H–I). Pseudoscopula: tarsus I–IV totally covered.
PALP. Tibia with retrolateral conspicuous depression and spines concentrated at basal and apical portions (Fig. 24C); embolus with basal torsion and opening of sperm duct in shape of a quill tip (Fig. 24D–E).
PALP AND LEG MEASUREMENTS. Palp = 11.8 (4.3, 2.2, 3.8, 1.5), I = 28.4 (8.5, 3.8, 6.6, 6.7, 2.8), II = 26.9 (7.8, 3.4, 6, 6.3, 3.1), III = 23.7 (6.1, 3.3, 4.3, 6.4, 3.6), IV = 32.6 (8.4, 3.7, 7.9, 8.6, 4).
SPINATION. Palp: Ti r20, Ta d0-0-1. Leg I: Mt p0-0-2, r2-2-4, Ta p2-2-2, r3-3-4. Leg II: Mt p0-0-2, r0-3-3, Ta p2-3-3, r3-4-5. Leg III: Fe d2-1-1, Pa p2-4-5, Ti d2-2-1, v1-2-2, p4-4-6, Mt d2-2-5, v3-4-5, p3-4-6, r2-2-4, Ta p3-4-2, r3-3-6. Leg IV: Ti v1-2-3, p0-0-1, Mt v2-4-6, p1-2-4, Ta p1-4-6.
Female (MNRJ)
HABITUS. See Fig. 24J.
MEASUREMENTS. TBL 15.7, CL 6.2, CW 5.7, LL 0.9, LW 1.3, SL 3.9, SW 3.4.
COLOR. Brown carapace and legs, brownish sternum and coxae (Fig. 24J–K), gray abdomen.
PROSOMA. Carapace and ocular arrangement as shown in Fig. 24J. Eye tubercle: 1.2 long; 0.8 wide. AME-ALE distance 1. Eye diameters: AME 0.2, ALE 0.3, PME 0.2, PLE 0.4. Thoracic fovea procurved (Fig. 24J). Labium with 2 cuspules (Fig. 24K). Maxilla with 48 cuspules, distributed over anterior ventral half, with 6 large cuspules at anterior ventral retrolateral end and 6 large cuspules at anterior ventral prolateral end (Fig. 24K). Basal segment of chelicerae with a prolateral row of 7 large teeth and 5 small retrolateral teeth, grouped on basal half, rastellum with 22 short and thick spines (Fig. 24K).
PALP AND LEG MEASUREMENTS. Palp = 11.4 (4, 2.4, 2.4, 2.6), I = 12.2 (3.7, 2.8, 2.6, 1.7, 1.4), II = 11.4 (3.6, 2.5, 2.3, 1.6, 1.4), III = 13.6 (4.1, 2.5, 2.2, 2.1, 2.7), IV = 15.7 (4.4, 3.1, 3.1, 3.2, 1.9).
SPINATION. Palp: Ti p4-10-12, r4-6-8, Ta p6-8-7, r10-13-9. Leg I: Ti v0-2-2, p4-5-6, r1-3-9, Mt v2-2-3, p6-6-9, r4-3-5, Ta v0-0-3, p2-3-3, r4-3-5. Leg II: Fe v0-0-2, Pa v0-0-1, Ti v1-1-2, p4-5-6, r0-0-1, Mt v1- 2-1, p4-6-9, r1-2-1, Ta v0-1-3, p4-4-4, r4-4-2. Leg III: Pa d0-0-2, Ti p2-3-2, r0-0-3, Mt v0-0-1, r3-1-1, 4-4-3, Ta v0-4-3, p0-2-3. Leg IV: Fe d0-0-2, v0-0-3, Ti v1-1-3, Mt v3-4-6, p1-2-3, Ta v3-3-4, p1-2-3.
SPERMATHECAE. Short and narrow sclerotized base, ducts with same width as receptacles (Fig. 24L).
Distribution
Brazil. Found in Atlantic Forest phytophysiognomie in the state of Rio de Janeiro (Fig. 3D).
description: Published as part of Fonseca-Ferreira, Rafael, Guadanucci, José Paulo Leite, Yamamoto, Flávio Uemori & Brescovit, Antonio Domingos, 2021, Taxonomic revision of the Neotropical spiders of the genus Idiops Perty, 1833 (Araneae, Idiopidae), with description of four new species, pp. 1-71 in European Journal of Taxonomy 780 (1) on pages 43-46, DOI: 10.5852/ejt.2021.780.1581, http://zenodo.org/record/5761280