Idiops duocordibus Fonseca-Ferreira, Guadanucci & Brescovit, 2021

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 : 30-33

Idiops duocordibus Fonseca-Ferreira, Guadanucci & Brescovit sp. nov.

urn:lsid:zoobank.org:act:D3387D49-8B8B-42C0-ADB9-88D5A8A78B62

Figs 3B , 17A–L

Diagnosis

Males and females of Idiops duocordibus sp. nov. differ from the other Neotropical species by the light brown coxae and trochanters, contrasting with the brown body ( Fig. 17A–L ). The male resembles that of I. rohdei by the short metatarsus I with prolateral curvature and with a slight prolateral projection on the apical half ( Fig. 17I ), but differs by the tibial apophysis with a triangular apical branch twice the size of the basal branch ( Fig. 17G–H ) and by the weakly curved embolus ( Fig. 17D ). The female ( Fig. 17J–L ) differs from those of the other species by having the spermathecae with bilobed receptacles in the shape of a heart ( Fig. 17L ).

Etymology

The specific epithet refers to the heart-shaped receptacles of the female genitalia.

Type material

Holotype BRAZIL – Pará • ♂; Vitória do Xingu, Ilha Taboca ; 3°23′12.7″ S, 51°57′26.2″ W; 3 Nov. 2000; F. Oliveira leg.; MPEG 0124 .

Paratypes BRAZIL – Pará • 1 ♂; Almeirim, Reserva de Itapeguara ; 0°32′04.9″ S, 52°48′14.8″ W; Dec. 2001; MPEG 0122 • 1 ♀; Arapari, Rio Tocantins , left bank; 4°52′23.6″ S, 49°31′39.5″ W; 14 Mar. 1984; W.L. Overal leg.; MPEG 0123 .

Other material examined

BRAZIL – Amazonas • 1 ♂; Manaus, Reserva Florestal Adolpho Ducke ; 3°0′27″ S, 59°56′22.92″ W; 9 Sep. 1991; H. Höfer and T. Gasnier leg.; INPA 4592 • 1 ♂; Manaus, Reserva Florestal Adolpho Ducke ; 14–24 Jul. 1991; A.D. Brescovit leg.; MCN 21485. – Pará • 2 ♂♂; Vitória do Xingu, Ilha Taboca ; 3°23′12.7″ S, 51°57′26.2″ W; 23 Nov. 2000; F. Oliveira leg.; MPEG 0112 , MPEG 0114 .

Description

Male (holotype MPEG 0124)

HABITUS. See Fig. 17A .

MEASUREMENTS. TBL 10, CL 4.6, CW 4, LL 0.5, LW 0.7, SL 2.4, SW 2.2.

COLOR. Carapace brown, light brown coxae and trochanter ( Fig. 17A–B ). Abdomen dark gray.

PROSOMA. Carapace and ocular arrangement as shown in Fig. 17A . Eye tubercle: 0.68 long; 1.08 wide. AME-ALE distance 0.63. Eye diameters: AME 0.32, ALE 0.34, PME 0.13, PLE 0.22. Thoracic fovea procurved ( Fig. 17A ). Labium and sternum without cuspules ( Fig. 17B ). Basal segment of chelicerae with a prolateral row of 5 small teeth equally distributed, rastellum with 5 spines ( Fig. 17B ).

LEGS. Tibia, metatarsus and tarsus I as shown in Fig. 17G . Leg I with double tibial apophysis. Leg I tibial apophysis with apical branch twice the size of basal branch and with a conspicuous spine ( Fig. 17G–I ). Pseudoscopula: tarsus I weakly covered ( Fig. 17G ), tarsus II–IV totally covered.

PALP. Tibia with thickened median portion and with larger spines concentrated in basal portion of retrolateral depression ( Fig. 17C ), embolus elongated, tapered, and slightly curved, with torsion on apical portion ( Fig. 17D–F ), keel along embolus length extending to apical portion ( Fig. 17D ).

PALP AND LEG MEASUREMENTS. Palp = 6.9 (2.3, 1.3, 2.4, 0.9), I = 13.4 (4.3, 1.9, 3, 2.9, 1.3), II = 11.3 (3.5, 1.8, 2.5, 2.5, 1), III = 10 (2.7, 1.5, 1.9, 2.6, 1.3), IV = 13.6 (3.9, 1.9, 3.5, 3.1, 1.2).

SPINATION. Palp: Ti r39, Ta d0-0-3. Leg I: Pa v0-1-2, r1-2-3, Ti v1-2-3, r1-2-6, Mt v1-4-7, p0-0-2, p0-1-1, r4-4-5, Ta v0-1-0, p0-2-3, p1-2-3, r4-4-3. Leg II: Pa v0-0-3, d0-0-1, Ti v2-3-7, d3-4-8, Mt v4-6-8, d5-6-7, p1-2-4, r0-2-3, Ta p1-3-3, r2-2-3. Leg III: Pa v0-0-2, Ti v1-2-3 r0-1-0, Mt v3-6-7, d0-0-2, p2-2-3, r1-2-4, Ta p3-4-4, r1-3-3. Leg IV: Pa v0-0-3, Ti v1-2-2, Mt v1-4-8, p0-0-1, r0-2-3, Ta v2-4-5, p0-1-2, r2-3-2.

Female (paratype MPEG 0123)

HABITUS. See Fig. 17J .

MEASUREMENTS. TBL 9.9, CL 5.5, CW 4,8, LL 0.9, LW 1.2, SL 3.4, SW 2.9.

COLOR. Brown carapace and trochanter, remainder of leg light brown ( Fig. 17J–L ). Abdomen dark gray.

PROSOMA. Carapace and ocular arrangement as shown in Fig. 17J . Eye tubercle: 0.7 long; 1.1 wide. AME-ALE distance 0.9. Eye diameters: AME 0.3, ALE 0.3, PME 0.2, PLE 0.4. Thoracic fovea procurved ( Fig. 17J ). Labium with with 13 cuspules ( Fig. 17K ). Maxilla with 117 cuspules, distributed throughout the maxillae, with larger spines on anterior half ( Fig. 17K ). Basal segment of chelicerae with a prolateral row of 6 large teeth and 2 retrolateral small teeth, grouped in basal half, rastellum with 16–18 short and thick spines ( Fig. 17K ).

PALP AND LEG MEASUREMENTS. Palp = 6.4 (2.3, 1.2, 1.6, 1.3), I = 7.4 (2.5, 1.5, 1.6, 1, 0.8), II = 6.5 (2.3, 1.6, 1.2, 0.9, 0.5), III = 7 (1.9, 1.6, 1.3, 1.4, 0.8), IV = 9.5 (2.6, 1.7, 2.1, 2.2, 0.9).

SPINATION. Palp: Pa p0-0-1, Ti p4-7-7, r4-6-8, Ta p10-8-7, r10-7-9. Leg I: Ti p4-4-5, r3-5-8, Mt p8-7-8, r5-5-6, Ta p3-4-2, r5-4-0. Leg II: Ti v1-1-2, p3-3-4, r0-1-3, Mt v1-1-2, p6-7-9, r2-2-1, Ta p2-3-3, r2-1-0. Leg III: Pa p4-5-10, Ti v0-0-2, p2-4-6, r4-4-6, Mt v1-1-2, d0-0-2, p3-3-3, r0-2-1. Leg IV: Ti v1-1-2, Mt v1-1-3, vp0-0-2, Ta v0-1-2, p1-1-2.

SPERMATHECAE. Single sclerotized base that is divided into two divergent ducts, receptacula strongly sclerotized ( Fig. 17L ).

Distribution

Brazil. Distributed in phytophysiognomies in the Amazon, with records for the North region (western Amazonas and northwestern Pará) ( Fig. 3B )

Figures

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

Fig. 17. Idiops duocordibus Fonseca-Ferreira, Guadanucci & Brescovit sp. nov. A–I. ♂, holotype (MPEG 0124). A. Prosoma (dorsal view). B. Prosoma (ventral view). C. Part of palp (retrolateral view). D–F. Palpal bulb. D. Dorsal view. E. Retrolateral view. F. Prolateral view. G. Tibia, metatarsus and tarsus I (prolateral view). H. Tibial apophysis (prolateral view). I. Tibial apophysis and metatarsus I (dorsal view). J–L. ♀, paratype (MPEG 0123). J. Prosoma (dorsal view). K. Prosoma (ventral view). L. Genitalia (dorsal view). Abbreviation: K = keel. Scale bars = 1 mm.