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 )

Figures

Fig. 3. Distribution of species of Idiops Perty, 1833 in the Neotropical region (part).

Fig. 34. Idiops siolii (Bücherl, 1953), ♀, neotype (MPEG 1012). A. Prosoma (dorsal view). B. Prosoma (ventral view). C. Genitalia (dorsal view). Scale bars = 1 mm.