Amphidraus pulvinus, Ruiz, 2017

Ruiz, Gustavo R. S., 2017, Ten new species of Amphidraus Simon, 1900 (Araneae: Salticidae: Euophryini) and three new combinations, Zootaxa 4312 (3), pp. 401-437 : 410-412

Amphidraus pulvinus sp. nov.

Figs 7–8

Type material. Holotype: ♂ from Juruti , 02°30'27.4"S, 56°10'39.5"W, Pará, Brazil, 18–23.II.2011, B.V.B. Rodrigues leg. ( MPEG 32687 ).

Etymology. A Latin noun meaning pillow, in reference to the modified RTA.

Diagnosis. The embolic disc and embolus of A. pulvinus sp. nov. are similar to those of A. argentinensis : the short dPED points prolaterally and the vPED points retrolaterally. However, the vPED of A. pulvinus sp. nov. arises from prolateral border of the embolic disc ( Fig. 8 C), while in A. argentinensis it arises from the middle of the distal portion of the disc (see Galiano 1997: fig. 10). In addition, A. pulvinus sp. nov. has RvTA and ITA bladeshaped, and a RTA linked to a pillow-like membrane (black arrows in Figs 8 B, 8D), whereas in A. argentinensis the RvTA is trapezoidal with three apical teeth, and both the ITA and the pillow-like membrane are absent (see Galiano 1997: figs 8, 11). Amphidraus complexus also has the pillow-like membrane, but differs from A. pulvinus sp. nov. in having one less projection in the embolic disc and a different shape of the tibial apophyses (see Zhang & Maddison, 2015: figs 211, 212).

Description. Male holotype (MPEG 32687). Total length: 2.55. Carapace 1.25 long, 0.84 wide and 0.65 high. Ocular quadrangle 0.67 long. Anterior eye row 0.87 wide, posterior 0.72 wide. Legs: 431 = 2. Length of leg I 1.90 (0.57 + 0.68 + 0.65); II 1.90 (0.57 + 0.68 + 0.65); III 2.47 (0.72 + 0.84 + 0.91); IV 2.62 (0.76 + 0.87 + 0.99). Palp ( Figs 8 A–D): cymbium with a proximal, retrolateral depression, where the pillow-like membrane of tibia fits ( Fig. 8 D); tegulum with slight RSDL and tegular lobe prolaterally curved ( Fig. 8 C); embolic filament very short, less than a quarter the length of the straight, sclerotized portion ( Fig. 8 C). Color in alcohol: thoracic area brown and cephalic area black; abdomen dorsally brown and variegated; ventrally pale; legs light brown ( Figs 7 A–B).

Female. Unknown

Distribution. Known only from the type locality ( Brazil, Pará) ( Fig. 29 ).

Figures

FIGURE 7. Amphidraus pulvinus sp. nov. A male Holotype, dorsal view; B same, ventral view.

FIGURE 8. Amphidraus pulvinus sp. nov. A left male palp, prolateral view; B same, dorsal view; C same, ventral view; D same, retrolateral view. CC, cymbial conductor; dPED, distal process on embolic disc; E, embolus; ED, embolic disc; ITA, intermediate tibial apopHysis; RSDL, retrolateral sperm duct loop; RTA, retrolateral tibial apopHysis; RvTA, retroventral tibial apopHysis; TL, tegular lobe; vPED, ventral process on embolic disc. Black arrows indicate pillow-like membrane.

FIGURE 29. Map of records of A. pulvinus sp. nov., A. caxiuanan sp. nov. and A. loxodontillus sp. nov. For context of tHis map witHin SoutH America, see Fig. 28.