Amphidraus cornipalpis

Salgado, Alexandre & Ruiz, Gustavo R. S., 2019, Seven new species of Amphidraus Simon, 1900 (Araneae: Salticidae: Euophryini), Zootaxa 4563 (3), pp. 451-481: 452-453

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Amphidraus cornipalpis

sp. nov.

Amphidraus cornipalpis  sp. nov.

Figs 1–6View FIGURE 1View FIGURE 2View FIGURE 3View FIGURE 4View FIGURE 5View FIGURE 6, 14View FIGURE 14

Type material. Holotype: ƋGoogleMaps  from Parque Nacional da Serra   GoogleMaps das Confusões, [09°10'31.4"S, 43°33'20.8"W], Guaribas, Piauí, Brazil, 15.XII.10, L.S. Carvalho et al. leg. ( MPEG 35014View Materials). Paratypes: 1 ♀, same data as holotype [ MPEG 35015View Materials]GoogleMaps  ; 1♂ and 1♀ from Caruaru , [08°17'08.6"S, 35°58'06.7"W], Pernambuco, Brazil, 2009–2010, H.P. Amorim leg. [ IBSP 160615View Materials (♂), 160616 (♀)]GoogleMaps  .

Etymology. The specific epithet is a compound adjective in Latin (cornus + palpus) and refers to the shape of distal process on the embolic disc ( Fig. 3AView FIGURE 3).

Diagnosis. Males of Amphidraus cornipalpis  sp. nov. share similarities with those of Amphidraus loxodontillus Salgado & Ruiz, 2017  , both with an embolic disc with one poorly-sclerotized, distal lamella that covers part of dPED ventral view (white arrows in Figs 3View FIGURE 3 A–B). However, males of A. cornipalpis  sp. nov. can be distinguished from those of A. loxodontillus  by having a longer and acute distal process on embolic disc (dPED) with the tip curved distally (shaped like a cow horn) ( Figs 2CView FIGURE 2, 3AView FIGURE 3, 5A, 5DView FIGURE 5, 6View FIGURE 6 D–E), whereas in A. loxodontillus  the dPED is short and rounded ( Fig. 3BView FIGURE 3; see also Salgado & Ruiz 2017: fig. 26C). In addition, A. cornipalpis  sp. nov. has a reduced RTA (as large as RvTA in A. loxodontillus  ) and a small ITA in the male palp ( Figs 5B, 5EView FIGURE 5), which is absent in A. loxodontillus  (see Salgado & Ruiz 2017: figs 26B, 26D). Also, males of A. cornipalpis  sp. nov. differ from those of all other species of Amphidraus  by having a tubercle placed on proximal dorso-retrolateral portion of the cymbium (black arrows in Figs 2View FIGURE 2 C–F, 5A–B, 5E, 6C) (present also in Yacuitella nana Galiano, 1999  ). Females of A. cornipalpis  sp. nov. are similar to those of Y. nana  by the arrangement of copulatory ducts and spermathecae in the epigyne, but differ from that species by having more separate copulatory openings, longer copulatory ducts and no tubercle on the epigynal plate ( Fig. 5FView FIGURE 5), which is medially placed in Y. nana  (see Galiano 1999: figs 12–14).

Description. Male holotype (MPEG 35014). Total length: 3.33. Carapace 1.78 long, 1.23 wide and 0.89 high. Ocular quadrangle 0.83 long. Anterior eye row 1.25 wide, posterior 1.13 wide. Legs 4312. Length of leg: I 2.65 (0.83 + 1.00 + 0.82); II 2.54 (0.81 + 0.93 + 0.80); III 3.12 (1.01 + 1.09 + 1.02); IV 3.40 (0.97 + 1.19 + 1.24). Palp ( Figs 2View FIGURE 2 C–F, 3A, 5A–E, 6A–E): femur with large and low bump on median-ventral portion ( Fig. 5CView FIGURE 5); patella with no modifications; tibia with a prolateral rounded expansion and a ventro-distal depression ( Figs 2View FIGURE 2 D–F, 5A, 5E, 6A); large RvTA with acute tip ( Figs 2DView FIGURE 2, 5BView FIGURE 5, 6CView FIGURE 6); short, poorly-sclerotized ITA retrolaterally projected ( Figs 2FView FIGURE 2, 5EView FIGURE 5, 6CView FIGURE 6); cymbium oval ( Figs 2FView FIGURE 2, 5EView FIGURE 5), with conductor (cc) wider than long with sinuous proximal border ( Figs 2EView FIGURE 2, 6View FIGURE 6 A–B); tegulum with slender lobe curved to prolateral side ( Figs 2CView FIGURE 2, 3AView FIGURE 3, 5A, 5DView FIGURE 5); embolus shaft (e) with tip strongly curved to retrolateral side ( Figs 2CView FIGURE 2, 3AView FIGURE 3, 5AView FIGURE 5); embolic filament (ef) longer than embolus shaft ( Figs 3AView FIGURE 3, 5A, 5DView FIGURE 5). Color in alcohol ( Figs 1View FIGURE 1, 2View FIGURE 2 A–B): cephalic area black; thoracic area light brown with a black procurved arc; chelicera light brown; palp light brown, with black mark ventrally on femur and with dark brown cymbium; mouthparts and sternum light brown; abdomen dorsally and ventrally light brown variegated with dark brown; legs light brown with a distal black ring on metatarsi III and two black rings on metatarsi IV, one proximal and another distal.

Female paratype (MPEG 35015). Total length: 3.77. Carapace 1.66 long, 1.15 wide and 0.81 high. Ocular quadrangle 0.80 long. Anterior eye row 1.13 wide, posterior 1.00 wide. Legs 4312. Length of leg: I 2.54 (0.83 + 1.00 + 0.71); II 2.25 (0.73 + 0.88 + 0.64); III 3.08 (1.05 + 1.05 + 0.98); IV 3.55 (1.08 + 1.23 + 1.24). Epigyne/vulva ( Figs 4CView FIGURE 4, 5FView FIGURE 5): epigynal plate with posterior border slightly bilobed; copulatory openings separated by approximately two diameters of copulatory ducts; long and convoluted copulatory ducts, forming a pair of rounded masses with spermathecae; oval spermathecae diagonally projected; fertilization ducts anteriorly placed and laterally projected. Color in alcohol ( Figs 4View FIGURE 4 A–B): cephalic area black; thoracic area dorso-laterally dark brown and centrally light brown; abdomen dorsally and laterally variegated with brown; ventrally pale; pale legs with black spots, being more intense on metatarsi III and IV (same pattern as in male).

Distribution. Known from the states of Pernambuco and Piauí ( Brazil) ( Fig. 14View FIGURE 14).