Amphidraus shenlong, 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 : 468-472

Amphidraus shenlong sp. nov.

Figs 21 , 22 , 26 E–F, 26H, 28B, 30

Type material. Holotype: ♂ from Conceição do Araguaia , 07°59’53.7”S, 49°22’27.1”W, Pará, Brazil, 16.I.2018, R.P.S Almeida. & F.V. Arruda leg. ( MPEG 35020 ). Paratypes: 2♂, same data as holotype ( MPEG 35021 , IBSP 221864 ) .

Additional material examined. BRAZIL: Pará: 4♂ from Conceição do Araguaia , 07°59’53.7”S, 49°22’27.1”W, 16.I.2018, R.P.S Almeida. & F.V. Arruda leg. ( MPEG 32794 , 32807 ).

Etymology. The specific epithet (noun in apposition) is the name of a dragon of Chinese mythology and refers to the big projection of the embolic disc, which recalls a dragon’s tail (white arrow in Fig. 21D ).

Diagnosis. A. shenlong sp. nov. is similar to A. draconicaudatus Salgado & Ruiz, 2017 by having an elongate and stout projection on the retrolateral border of the embolic disc that extends towards the retrolateral tegulum border and bears several branches ( Figs 21 C–D, 26A, 27A), and by having the RvTA ventrally projected with projections on its border ( Figs 21F , 22B , 26G ). However, A. shenlong sp. nov. can be distinguished by having the RvTA with four projections (three with acute tip and one with serrated tip) and the RTA serrated tip reaching the same height of the RvTA tip along palp axis ( Figs 21F , 22B , 26H ), whereas in A. draconicaudatus the RvTA has a single serrated projection and the RTA is reduced to spikes ( Figs 26G , 27 C–D).

Description. Male holotype (MPEG 35020). Total length: 2.68. Carapace 1.31 long, 0.89 wide, 0.69 high. Ocular quadrangle 0.71 long. Anterior eye row 1.01 wide, posterior 0.86 wide. Legs 3412. Length of legs: I 1.82 (0.61 + 0.62 + 0.59); II 1.68 (0.59 + 0.57 + 0.52); III 2.42 (0.83 + 0.84 + 0.75); IV 2.29 (0.69 + 0.75 + 0.85). Chelicera with pocket on outer surface (between dorsum and retrolateral face) ( Fig. 28B ). Palp ( Figs 21 C–F, 22A– B): femur with median-ventral region slight prominent ( Fig. 21F ); cymbium oval; cymbial conductor leaf-shaped ( Fig. 22A ); tegulum with narrow lobe curved to retrolateral side ( Figs 21E , 22A ); embolic disc with three processes very closer together: two rounded distal processes (dPED) almost fused and one short triangular ventral process (vPED) ( Figs 21E , 22A ). Embolic filament about as long as embolus shaft ( Figs 21C, 21E ). Color in alcohol ( Figs 21 A–B): cephalic area black; thoracic area yellow; abdomen dorsally variegated with yellow and brown; ventrally yellow; legs yellow.

Female. Unknown.

Distribution. Known only from the type locality (state of Pará, Brazil) ( Fig. 30 ).

Natural History. The specimens were collected from ecotonal zone between the Cerrado and the Amazon rainforest.

Figures

FIGURE 21. Amphidraus shenlong sp. nov. A–B male (A dorsal, B ventral); C–F left male palp (C ventral; D retroventral; E bulb, ventral; F femur + patella + tibia, retrolateral). Abbreviations: cc, cymbial conductor; dPED, distal process on embolic disc; e, embolus shaft; ef, embolic filament; RTA, retrolateral tibial apophysis; RvTA, retroventral tibial apophysis; TL, tegular lobe; vPED, ventral process on embolic disc. White arrow in D shows branchy projection of embolic disc.

FIGURE 22. Amphidraus shenlong sp. nov., left male palp (A ventral; B retrolateral). Abbreviations: cc, cymbial conductor; dPED, distal processes on embolic disc; e, embolus shaft; ed, embolic disc; ef, embolic filament; RTA, retrolateral tibial apophysis; RvTA, retroventral tibial apophysis; TL, tegular lobe; vPED, ventral process on embolic disc.

FIGURE 26. Left male palp in Amphidraus spp. A–D, G Amphidraus draconicaudatus Salgado & Ruiz, 2017. A–B, G new specimen from Pium (A bulb, ventral; B retroventral; G tibia, retrolateral). C–D specimen from Caseara (C bulb, ventral; D retroventral). E–F, H Amphidraus shenlong sp. nov. (E bulb, ventral; F retroventral; H tibia, retrolateral). Abbreviations: dPED, distal process on embolic disc; e, embolus shaft; ef, embolic filament; RTA, retrolateral tibial apophysis; RvTA, retroventral tibial apophysis; vPED, ventral process on embolic disc.

FIGURE 27. Copulatory structures of Amphidraus draconicaudatus Salgado & Ruiz, 2017. A–D left male palp (A embolic disc, ventral; patella + tibia, retrolateral; C detail of RvTA projection; D detail of reduced RTA). E epigyne/vulva, dorsal. Abbreviations: dPED, distal processes on embolic disc; e, embolus shaft; ef, embolic filament; po, coupling pocket; RvTA, retroventral tibial apophysis; vPED, ventral process on embolic disc. White arrows in B and C show projection on RvTA, and black arrow in C shows one spike of the reduced RTA.

FIGURE 28. Right chelicera, retrolateral (A Amphidraus draconicaudatus, B A. shenlong sp. nov. C A. draconitupan sp. nov.). Black arrow shows pocket on outer face.

FIGURE 30. Map of northern Brazil showing records of Amphidraus draconicaudatus, A. shenlong sp. nov. and A. draconitupan sp. nov. White lines represent the borders of Brazilian states. Acronyms of states: MG, Minas Gerais; MS, Mato Grosso do Sul; PA, Pará; SP, São Paulo; TO, Tocantins. Map modified from Google Earth ®.