Amphidraus boomerang, Salgado & Ruiz, 2019

Salgado, Alexandre & Ruiz, Gustavo R. S., 2019, Seven new species of Amphidraus Simon, 1900 (Araneae: Salticidae: Euophryini), Zootaxa 4563 (3), pp. 451-481 : 454-457

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 ).

Figures

FIGURE 7. Amphidraus boomerang sp. nov. A–B male (A dorsal, B ventral); C–F left male palp (C ventral, D retrolateral, E retroventral, F dorsal). Abbreviations: Cy, cymbium; dPED, distal process on embolic disc; e, embolus shaft; ef, embolic filament; pPED, proximal process on embolic disc; RTA, retrolateral tibial apophysis; RvTA, retroventral tibial apophysis; T, tegulum; vPED, ventral process on embolic disc. White arrows in C, E show the basal projection of embolus shaft.

FIGURE 8. Amphidraus boomerang sp. nov., left male palp (A ventral, B retrolateral, C prolateral, D dorsal). Abbreviations: cc, cymbial conductor; e, embolus shaft; ed, embolic disc; ef, embolic filament; dPED, distal process on embolic disc; pPED, proximal process on embolic disc; RTA, retrolateral tibial apophysis; RvTA, retroventral tibial apophysis; TL, tegular lobe; vPED, ventral process on embolic disc.

FIGURE 14. Map of northern/northeastern Brazil showing records of Amphidraus araripe, A. boomerang, A. cornipalpis and A. sacrificatus. White lines represent the borders of Brazilian states. Map modified from Google Earth ®.