Idiops siolii (Bücherl, 1953)

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, European Journal of Taxonomy 780 (1), pp. 1-71 : 63-65

Idiops siolii (Bücherl, 1953)

Figs 3B, 34

Pseudidiops siolli Bücherl, 1953: 126 , figs 6–8.

Idiops siolii – Raven 1985: 158.

Diagnosis

The female of Idiops siolii differs from that of other Neotropical species by having the spermathecae with ducts with a thickened median portion and mushroom-shaped receptacles ( Fig. 34C).

Type material

Holotype BRAZIL – Pará • ♀; Belém, Campus do IAN - Embrapa Amazônia Oriental ; IBSP 3123 . Lost in the fire of 2010.

Neotype (here designated) BRAZIL – Pará • ♀; Melgaço, Flona Caxiuanã , Estação Científica Ferreira Penna, Plote B; 1°47′32.3″ S, 51°26′2.5″ W; 6–11 Apr. 2002; MPEG 1012 .

Remark: The type specimen of Idiops siolii was lost in the 2010 IBSP 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. The neotype is a specimen collected near the type locality, in the state of Pará, Brazil.

Description

Male

Unknown.

Female (neotype MPEG 1012)

HABITUS. See Fig. 34A.

MEASUREMENTS. TBL 13.8, CL 7.6, CW 6.6, LL 1.1, LW 1.5, SL 4.4, SW 3.7.

COLOR. Carapace and legs reddish brown, with yellowish coxae, reddish brown sternum ( Fig. 34A–B). Abdomen gray.

PROSOMA. Carapace and ocular arrangement as shown in Fig. 34A. Eye tubercle: 0.7 long; 1.4 wide. AME-ALE distance 1. Eye diameters: AME 0.21,ALE 0.5, PME 0.2, PLE 0.4. Thoracic fovea procurved. Labium with 3 cuspules ( Fig. 34B). Maxilla with 31 cuspules, distributed throughout anterior ventral

half ( Fig. 34B). Basal segment of chelicerae with a prolateral row of 8 large teeth and 4 small retrolateral teeth, grouped in basal half; rastellum with 20–22 short spines of same size ( Fig. 34B).

PALP AND LEG MEASUREMENTS. Palp = 12.5 (4.2, 2.7, 2.7, 2.9), I = 13.8 (4.5, 2.8, 3, 2.1, 1.4), II = 13.2 (4.3, 3, 2.5, 2, 1.4), III = 12 (4.1, 2.3, 2.8, 2, 0.8), IV = 18.4 (4.4, 3.9, 4, 3.6, 2.5).

SPINATION. Palp: Ti p7-9-12, r6-10-10, Ta p12-10-11, r14-12-9. Leg I: Ti p3-7-10, r9-8-10, Mt p11-8-11, r3-9-8, Ta v0-0-3, p5-4-3, r5-5-4. Leg II: Pa p5-5-12, Ti v1-1-1, p2-4-6, r0-2-3, Mt v2-2-3, d2-2-2, p6- 4-2, r2-3-1, Ta v2-4-5, p0-2-5, r0-1-1. Leg III: Ti v1-1-0, r0-1-1, p2-6-7, Mt v2-2-4, p9-7-9, r2-2-2, Ta v0-0-3, p5-5-2, r1-0-0. Leg IV: Ti v0-0-1, Mt v0-1-2, p1-2-3, r0-1-1, Ta v2-1-2, p1-5-5, r0-2-2.

SPERMATHECAE. V-shaped ducts with sclerotized portion between duct and receptacles. Bilobed ducts sclerotized, with evident granules ( Fig. 34C).

Distribution

Brazil. Known only for the region of Belém and Melgaço (Pará), in the phytophysiognomies of the Amazonian region ( Fig. 3B)