Amphidraus boomerang sp. nov.

Figs 7–8, 14

Type material. Holotype: Ƌ from Fazenda Nazareth, [4°45'03.4"S; 42°35'14.2"W], José de Freitas, Piauí, Brazil, 31.I.2004, V.O. Costa leg. (MPEG 9881).

Etymology. The specific epithet is a noun in apposition and refers to embolic disc, boomerang-shaped (Figs 7C, 8A).

Diagnosis. A. boomerang sp. nov. differs from all Amphidraus species by having the embolic disc boomerangshaped, due its expanded retrolateral border (Figs 7C, 8A). The retrolateral triangular lamella on the embolus shaft of A. boomerang sp. nov. is also present in A. argentinensis Galiano, 1997, near the emergence point of the embolic filament (see Galiano 1997: figs 9–10). A. boomerang sp. nov. can be distinguished from A. argentinensis by shape of the RvTA, large and with a ventral lobe in A. argentinensis (Galiano 1997: fig. 11) and reduced in A. boomerang sp. nov. (Fig. 8B).

Description. Male holotype (MPEG 9881). Total length: 3.08. Carapace 1.62 long, 1.07 wide and 0.85 high. Ocular quadrangle 0.83 long. Anterior eye row 1.17 wide, posterior 0.98 wide. Legs 4312. Length of leg: I 2.65 (0.82 + 1.01 + 0.82); II 2.49 (0.80 + 0.91 + 0.78); III 3.15 (0.99 + 1.05 + 1.11); IV 3.47 (1.02 + 1.21 + 1.24). Palp (Figs 7 C–F, 8A–D): femur and patella with no modifications; short RvTA with two apical teeth (Figs 7D, 8B); straight RTA with the same length of tibia and with membranous external border (Figs 7D, 7F, 8B, 8D); cymbium oval, with proximal dorso-prolateral portion prominent (Figs 7F, 8D); tegulum with thick and straight lobe (Figs 7C, 8A); embolic disc with a process with acute tip (dPED) placed on the median distal portion and projected to prolateral side, with a ventral process (vPED) ventrally projected and with a proximal process (pPED) projected to proximal side, hidden under the tegulum (Figs 7 C–E, 8A, 8C); embolus shaft (e) with tip curved to retrolateral side and with two processes: a triangular lamella placed at the middle of retrolateral border and a rounded basal process (Figs 7C, 8A); embolic filament (ef) approximately 1/2 the length of embolus shaft (Figs 7C, 8A). Color in alcohol (Figs 7 A–B): cephalic area black; thoracic area brown with light brown longitudinal stripe; abdomen dorsally variegated with light brown and with longitudinal stripe of white setae; ventrally pale; pale legs.

Female. Unknown.

Distribution. Known only from the type locality (state of Piauí) (Fig. 14).