Idiops hirsutipedis Mello-Leitão, 1941

Ferretti, N., Nime, M. & Mattoni, C., 2017, Three new Idiops (Mygalomorphae: Idiopidae) from Argentina and redescription of the male of I. hirsutipedis Mello-Leitão, 1941, Journal of Natural History (J. Nat. Hist.) 51 (17 - 18), pp. 975-994 : 980-982

Idiops hirsutipedis Mello-Leitão, 1941

( Figures 4–5 , 13 )

Idiops hirsutipedis Mello-Leitão, 1941: 100 , pl. 2, fig. 1; Gerschman de Pikelín and Schiapelli, 1963: 109, figs 1–7; Grismado and Goloboff, 2014: 109, figs 10–11

Type material

Holotype juvenile female. Argentina, La Rioja, Castro Barros (28°50′27″ S – 66°56′23″ W) ( MLP 14600). Images examined.

Additional material examined

Argentina, La Rioja, Guayapa, Patquía (30°3′0″ S – 66°52′59″ W), 29 November 1962, L . Yivoff col ., 1♂ (MACN-Ar5987); Argentina, Tucumán, Loro River (26°36′49.2″ S – 65°11′ 23.2″ W), 22 April 1987, P . Goloboff col ., 3♀ (MACN-Ar36844); Argentina, Tucumán, Cruz Alta , Cañete, La Soledad (26°50′24″ S – 65°9′43″ W), 14 November 1965, E . Bucher col ., 1♂ (MACN-Ar6385); Argentina, Tucumán, Cruz Alta , Cañete, La Soledad (26°50′24″ S – 65°9′43″ W), 21 August 1966, E . Bucher col ., 1♀ (MACN-Ar6386); Argentina, Tucumán, Saladillo stream between routes 9 and 347, 25 May 1983, P . Goloboff col ., 2♀ (MACN- Ar 36845); Argentina, Santiago del Estero, Tintina (27°2′54.5″ S – 62°42′27.99″ W), November 1954, M . Birabén col ., 1♀ (MACN-Ar7424).

Diagnosis

Males of I. hirsutipedis resemble I. clarus in the elongated carapace, but can be distinguished from the other Argentinean species by the curved metatarsus I with an apical prolateral process ( Figure 4 (d)); longer and thinner palpal tibia with three to four rows of strong retrolateral spines of similar sizes along the entire border of depression ( Figure 4 (f–g)); apical branch of tibial apophysis with a triangular and stout spine ( Figure 4 (d–e)) and tip of embolus of palpal bulb without apical expansion ( Figure 5 (a–c)). Females can be recognised by their elongated spermathecae with digitiform receptacles and very short ducts ( Figure 5 (d)).

Description

Female holotype (MLP 14600) fully described by Mello-Leitão (1941) and spermathecae presented by Gerschman de Pikelín and Schiapelli (1963).

Male (MACN-Ar5987). Colouration (in alcohol): carapace, chelicerae and legs uniformly light brown ( Figure 4 (a)), abdomen pale brown with a dorsal apical dark spot. Total length 11.54; carapace 5.52 long, 5.42 wide. Carapace oval with granules throughout ( Figure 4 (a)); fovea deep, procurved, 0.95 wide. Ocular group 1.33 long, 1.20 wide. ALE situated far in advance of the rest ( Figure 4 (c)). Posterior row slightly procurved. Distance between AME and ALE 0.23. Eye sizes and interdistances: AME 0.27, PME 0.17, ALE 0.30, PLE 0.33, AME–AME 0.15, PLE–PME 0.07, PME–PME 0.39. Labium 0.74 long, 0.88 wide, with 2 cuspules, labiosternal groove shallow. Maxillae with 4/3 (right/left) cuspules. Chelicerae with 6 promarginal teeth and 5 retromarginal teeth, rastellum conspicuous on a distinct process. Sternum elongated; 3.28 long, 2.29 wide with black bristles on margins ( Figure 4 (b)). Leg formula 4-1-2-3, morphometry (femur, patella, tibia, metatarsus, tarsus, total): I: 6.07, 3.26, 3.96, 4.22, 1.7, 19.21. II: 5.2, 2.61, 3.3, 3.54, 1.53, 16.18. III: 3.89, 2.46, 2.74, 3.68, 1.87, 14.64. IV: 5.29, 3.1, 4.5, 4.38, 2.11, 19.38. Palp: 3.92, 1.93, 3.46, –, 0.97, 10.28. Spines: Palp: femur 1–1–1–1–1d, patella 0, tibia 52r, tarsus 0. I: femur 1–1d, patella 1–2v, 1–1r, 1p, tibia 2–2–1–2–1–3v, 1p, 1–2r, metatarsus 5p, 5–4–6r, tarsus 4–6– 7r, 2–3– 3p. II: femur 1–1–1–1–1d, patella 2p, 1–1–2v, 2r, tibia 2–1–3–3–1p, 1–2–1–1–1– 1r, 3–2-3–3–2–2v, metatarsus 4–1–8p, 1–2–2v, 1–1–2–1–1–3r, tarsus 5–3–7r, 2–2– 3p. III: femur 1–2–2d, patella 4–5–10p, 2r, 2v, tibia 4–2–7p, 2–2–2v, 1–3–7r, metatarsus 1–2–2– 2–2–4p, 1–1–2–2v, 1–2–2–4r, tarsus 2–5–6r, 1–3– 3p. IV: femur 1–1d, patella 2v, 18p, tibia 1–2–1–3v, metatarsus 1–1–2v, 1–1–1–3p, 0–0–2r, tarsus 1–1–1r, 3–2– 7p. Scopulae: tarsus I with complete scopulae divided by three rows of conical setae, tarsus II, III and IV with complete and entire scopulae. Tibia of leg I with double tibial apophysis with apical branch bigger than basal branch ( Figure 4 (d–e)), the apical branch with a triangular stout and large apical spine and the basal branch with a smaller apical spine. Metatarsus I strongly curved with a well-developed, triangular prolateral process ( Figure 4 (d)). Palpal tibia with retrolateral concavity, crescent-shaped band of about 52 spines along the entire retrolateral side of concavity ( Figure 4 (f–g)). Palp with a very long embolus broad at base gradually tapering at distal end ( Figure 5 (a–c)).

Distribution

It was previously known from La Rioja, and new records are reported here for Tucumán and Santiago del Estero provinces, Argentina ( Figure 13 ).

Figures

Figure 4. Idiops hirsutipedis Mello-Leitão, 1941. Male (MACN-Ar5987). (a) Carapace, dorsal view. (b) Labium and sternum, ventral view. (c) Eye group, dorsal view. (d) Leg I, ventral view (arrow indicates lateral projection on metatarsus). (e) Leg I, prolateral view. (f–g) Palpal tibia, retrolateral view. Scale bars = 1 mm.

Figure 5. Idiops hirsutipedis Mello-Leitão, 1941. (a–c) Male (MACN-Ar5987), left palpal bulb. (a) Prolateral. (b) Retrolateral. (c) Dorsal. (d) Female juvenile holotype (MLP14600), spermathecae, dorsal view. D = duct; R = receptacle; SA = sclerotised basal area. Scale bars: a–c = 1 mm; D = 0.5 mm. Photo provided by Luis Pereira (MLP).

Figure 13. Map showing the distribution of the Idiops species treated in this work.