Idiops fuscus Perty, 1833

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 : 11-15

publication ID	https://doi.org/ 10.5852/ejt.2021.780.1581
publication LSID	lsid:zoobank.org:pub:932663A6-D83D-49E0-B1F7-87F7DA8DC086
DOI	https://doi.org/10.5281/zenodo.5762225
persistent identifier	https://treatment.plazi.org/id/03B4126E-E867-FFA1-EECE-FEE2FB7DFB03
treatment provided by	Felipe
scientific name	Idiops fuscus Perty, 1833
status

Treatment

Idiops fuscus Perty, 1833 View in CoL

Figs 2A–B View Fig , 4C View Fig , 6A View Fig , 7–8 View Fig View Fig

Idiops fusca Perty, 1833: 197 , pl. 39 fig. 5 (♂).

Sphasus idiops – Walckenaer 1837: 379 (new name for Idiops aculeatus – lapsus). — Petrunkevitch 1911: 780.

Idiops aculeatus – Walckenaer 1837: 379 (lapsus). — Petrunkevitch 1911: 775.

Idiops fuscus View in CoL – O. Pickard-Cambridge 1870: 103. — Simon 1892: 92, fig. 91.

Diagnosis

Males of I. fuscus ( Figs 7A–I View Fig ) differ from other Neotropical species of the genus, except I. clarus and I. pirassununguensis , by having palpal tibia with a prominent projection at the base of the retrolateral depression ( Fig. 7C View Fig ). Differs from I. clarus and I. pirassununguensis by the strong curvature of the median portion of the embolus in dorsal view (also present in I. nilopolensis ). Differs from I. nilopolensis by the distal portion of the embolus having a pronounced embolar lamella with differentiated dorsal and ventral edges (also present in I. rastratus ) ( Figs 7D–F View Fig , 8E–F View Fig ). The females differ from other Neotropical species by the aspect of the spermathecae, composed of two ducts slightly curved outward, with a soft and nonsclerotized basal portion and a median and apical portion strongly sclerotized and by the receptacula with a much larger diameter than the duct width ( Fig. 7L View Fig ).

Type material

Holotype BRAZIL – Piauí • MNHN. Should be in the MNHN, lost.

Neotype (here designated) BRAZIL – Piauí • ♂; Bom Jesus, Reserva Natural Serra do Teimoso ; 8°52′52.6″ S, 44°58′12″ W; 12 Jul.– 2 Aug. 2000; F. Curcioi and M. Pixo leg.; IBSP 11887 View Materials . GoogleMaps

Remark: Despite an intensive search, the type specimen of Idiops fuscus was not found in the MNHN, being considered lost. 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 stabilize the species. This neotype was based on a specimen collected near the type locality, in the state of Piauí, Brazil.

Other material examined

BRAZIL – Maranhão • 1 ♂; Carolina, Campus Hotel Rilton ; 7°19′58″ S, 47°28′8″ W; 10 Dec. 2005; UFMT GoogleMaps . – Piauí • 1 ♀; São Raimundo Nonato ; 9°0′54″ S, 42°41′56″ W; 6 Dec. 1994; R. Bertani and D. Pinz leg.; IBSP 9574 View Materials GoogleMaps • 3 ♂♂ ( SEM); União, Campus OMVAPI Ltda ; 4°35′9″ S, 42°51′50″ W; 2006; J. Queiroz et al. leg.; CHNUFPI 0036 GoogleMaps • 2 ♂♂; same collection data as for preceding; CHNUFPI 0030 , CHNUFPI 0038 GoogleMaps • 1 ♂; Guaribas, Parque Nacional da Serra das Confusões ; 9°12′55.5″ S, 43°29′.1″ W; 14 Dec. 2010; F.S. Silva leg.; CHNUFPI 4033 GoogleMaps • 1 ♂; Guaribas, Parque Nacional da Serra das Confusões ; 9°13′12.3″ S, 43°29′26.7″ W; 9–15 Dec. 2010; L.S. Carvalho leg.; CHNUFPI 4034 GoogleMaps • 1 ♂; Guaribas, Parque Nacional da Serra das Confusões ; 9°13′32.4″ S, 43°27′46.9″ W; 10 Dec. 2010; F.S. Silva leg.; CHNUFPI 4032 . – GoogleMaps Ceará • 1 ♂; Crato, Parque Estadual Sítio do Fundão ; 7°13′3″ S, 39°20′21″ W; May 2016; IBSP 218297 View Materials . – GoogleMaps Pernambuco • 2 ♂♂; Caruaru, Brejo ; 8°16′58″ S, 35°58′33″ W; Nov. 2010; H. Amorin leg.; IBSP 243978 View Materials , IBSP 243980 View Materials GoogleMaps • 1 ♂; Serra Talhada ; 7°59′9″ S, 38°17′45″ W; Nov. 2010; H. Amorin leg.; IBSP 243979 View Materials . – GoogleMaps Bahia • 1 ♀; Santa Inês, BR420 ; 13°15′48.7″ S, 39°47′2.8″ W; 18 Jun. 2018; P.H. Martins and E.A. Araújo leg.; UFMG 24028 View Materials GoogleMaps • 1 ♀; Brumado, Magnesita ; 14°10′51.5″ S, 41°42′0.7″ W; 24 Feb. 2017; P. Martins leg.; UFMG 24029 View Materials . – GoogleMaps Mato Grosso • 1 ♂; Chapada dos Guimarães ; 15°27′39″ S, 55°45′0″ W; 23 Mar. 2001; C. Strussmann leg.; MCTP 12212 View Materials . – GoogleMaps Minas Gerais • 1 ♂; Itaobim ; 16º31′58.6″ S, 41º30′37.5″ W; 25 Nov. 2011; I.L.F. Magalhães et al. leg.; UFMG 10098 View Materials . – GoogleMaps Mato Grosso do Sul • 4 ♂♂; Corumbá, Serra do Amolar ; 17°94′32″ S, 57°55′47″ W; 8–12 May 2001; C. Strussmann leg.; MCTP 12193 View Materials • 1 ♀; Bonito ; 21°7′15″ S, 56°28′55″ W; Oct. 2002; C.A. Rheims leg.; IBSP 225943 View Materials GoogleMaps • 1 ♂; Bonito, Abismo Anhumas ; 21°08′60″ S, 56°36′00″ W; Oct. 2002; C.A. Rheims leg.; IBSP 243976 View Materials GoogleMaps • 2 ♂♂; same collection data as for preceding; IBSP 243974 View Materials GoogleMaps • 3 ♂♂; same collection data as for preceding; IBSP 243975 View Materials GoogleMaps .

Description

Male (neotype IBSP 11887)

HABITUS. See Fig. 7A View Fig .

MEASUREMENTS. TBL 11.2, CL 5.3, CW 5, LL 0.7, LW 1, SL 3, SW 2.7.

COLOR. Brown carapace and legs, light brown sternum and coxae ( Fig. 7A–B View Fig ), grayish brown abdomen.

PROSOMA. Carapace and ocular arrangement as shown in Fig. 7A View Fig . Eye distance AME-ALE 0.6. Eye diameters: AME 0.3, ALE 0.3, PME 0.2, PLE 0.3. Thoracic fovea procurved ( Fig. 7A View Fig ). Labium and sternum without cuspules ( Fig. 7B View Fig ). Basal segment of chelicerae with a prolateral row of 10 large teeth and a retrolateral row of 10 small teeth, grouped in basal half, rastellum with 10–12 spines, distal ones longer ( Fig. 8A–B View Fig ).

LEGS. Tibia, metatarsus and tarsus I as shown in Fig. 7G View Fig . Leg I with double tibial apophysis composed of a short, thickened basal branch with a small tapered spine and an apical branch composed of a base twice the size of the basal branch, a thickened apical spine followed by two smaller spines ( Figs 7H–I View Fig , 8C View Fig ). Pseudoscopula: tarsus I with apical half with weak coverage ( Fig. 7G View Fig ); tarsus II, III and IV fully covered.

PALP. Tibia with conspicuous retrolateral depression and spines distributed along margin ( Fig. 7C View Fig ); embolus with torsion in apical portion, followed by a pronounced lamella, with upper and lower edges with different sizes ( Figs 7D–F View Fig , 8E–F View Fig ).

PALP AND LEG MEASUREMENTS. Palp = 8.8 (3, 1.4, 3, 1.4), I = 22.1 (6.6, 3, 4.7, 5, 2.8), II = 18.9 (5.7, 2.5, 3.9, 4.4, 2.4), III = 16.6 (4.5, 2.3, 2.8, 4.6, 2.4), IV = 22.7 (5.9, 2.7, 5.2, 6, 2.9).

SPINATION. Palp: Ti r20, Ta d0-0-8. Leg I: Pa v0-0-4, Mt v0-12, Ta p0-1-1, r1-1-1. Leg II: Ti v0-1-1-2, Mt v1-2-1-3, Ta p1-1-2, r1-1-3. Leg III: Fe d1-2-2, Pa p3-2-4, r0 -0-4, Ti d0-1-0, v1-2-2, p1-1-4, r1-1-2, Mt v2-2-1-3, p1-1-1, r3-1-0, Ta p1-2-3, r0-1-1. Leg IV: Fe d1-1-2, Ti v1-1-3, Mt v1-1-1-3, Ta p1-1-4, r0-0-2.

Female (IBSP 9574)

HABITUS. See Fig. 7J View Fig .

MEASUREMENTS. TBL 18.9, CL 8.2, CW 6.9, LL 1.2, LW 1.5, SL 4.7, SW 4.

COLOR. Brown carapace and legs, light brown sternum and coxae ( Fig. 7J–K View Fig ), grayish brown abdomen.

PROSOMA. Carapace and ocular arrangement as shown in Fig. 7J View Fig . Eye tubercle: 1.75 long, 1.83 wide. Distance AME-ALE 1. Eye diameters: AME 0.4, ALE 0.4, PME 0.3, PLE 0.5. Thoracic fovea procurved ( Fig. 7J View Fig ). Labium with 7 cuspules ( Fig. 7K View Fig ). Maxilla with 56 cuspules, distributed over anterior ventral half ( Fig. 7K View Fig ). Basal segment of chelicerae with a prolateral row of 10 large teeth and a retrolateral row of 10 small teeth, grouped in basal half. Robust rastellum, presenting 18–20 short and thick spines on a tubercle.

PALP AND LEG MEASUREMENTS. Palp = 12.3 (4.2, 2.7, 2.8, 2.6), I = 13.6 (4.6, 2.9, 2.9, 2.3, 0.9), II = 12.95 (4.3, 2.9, 2.5, 2.2, 1), III = 13.8 (3.7, 3.1, 2.3, 2.9, 1.85), IV = 19.4 (5.4, 3.8, 4.1, 4, 2.1).

SPINATION. Palp: Fe p0-0-2, Pa p0-0-1, Ti p3-6-7, r3-5-12, Ta v0-0-7, p7-7-7, r11-9-7. Leg I: Ti p3-4-8, r3-6-12, Mt p9-6-5, r8-7-5, Ta v0-0-5, p4-3-2, r4-2-2. Leg II: Ti p3-3-5, r1-1-1, Mt p9-7-7, r3-3-2, Ta v0-0-3, p4-5-2, r3-1-0. Leg III: Pa p3-5-10, r0-0-2, Ti v0-0-2, p1-3-3, r0-2-6, Mt v1r-1r-2, p7-1-1, r7-2-1, Ta v0-3-8. Leg IV: Pa p17-0-0, Ti v1-1-1, Mt v1-1-1-3, Ta v0-3-8.

SPERMATHECAE. Duct with apical half thicker than its basal half, oval receptacula ( Fig. 7L View Fig ).

Distribution

Brazil. Widely distributed, occurring in areas with phytophysiognomies in the Caatinga and Cerrado. Records for Central-West region (Mato Grosso, Mato Grosso do Sul), Northeast region (Bahia, Ceará, Maranhão, Paraíba, Pernambuco and Piauí) and the northern part of Minas Gerais ( Fig. 4C View Fig ).