Amphidraus sacrificatus

Salgado, Alexandre & Ruiz, Gustavo R. S., 2019, Seven new species of Amphidraus Simon, 1900 (Araneae: Salticidae: Euophryini), Zootaxa 4563 (3), pp. 451-481: 457-459

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Amphidraus sacrificatus

sp. nov.

Amphidraus sacrificatus  sp. nov.

Figs 9–10View FIGURE 9View FIGURE 10, 14View FIGURE 14

Type material. Holotype:GoogleMaps  ♂ from Conceição do Araguaia   GoogleMaps, 07°59’23.5”S, 49°24’28.8”W, Pará, Brazil, 16.I.2018, R.P.S Almeida. & F.V. Arruda leg. ( MPEG 35027View Materials). Paratypes: 2♂, same data as holotype ( MPEG 34602View Materials, IBSP 221863View Materials)GoogleMaps  .

Etymology. The specific epithet an adjective and refers to the heart-shaped membrane linked to proximal process on embolic disc ( Fig. 10BView FIGURE 10), in allusion to human sacrificial rituals practiced by some ancient cultures.

Diagnosis. Differs from all Amphidraus  species in having a blade-shaped embolus shaft ( Figs 9FView FIGURE 9, 10View FIGURE 10 A–B) and a proximal process on embolic disc (pPED) linked to a heart-shaped membrane [ Figs 9View FIGURE 9 C–D, 9F (white arrow), 10A–B, 10D]. In addition, the cymbial conductor (cc) is “Y-shaped” and faces retrolaterally ( Figs 9EView FIGURE 9, 10CView FIGURE 10) (cc faces ventrally in all the other described species; see Figs 13AView FIGURE 13, 17AView FIGURE 17).

Description. Male holotype (MPEG 35027). Total length: 4.45. Carapace 2.13 long, 1.46 wide, 1.03 high. Ocular quadrangle 1.10 long. Anterior eye row 1.48 wide, posterior 1.19 wide. Legs 4312. Length of legs: I 3.79 (1.22 + 1.43 + 1.14); II 3.62 (1.19 + 1.28 + 1.15); III 4.46 (1.40 + 1.45 + 1.61); IV 4.75 (1.39 + 1.61 + 1.75). Palp ( Figs 9View FIGURE 9 C–F, 10A–E): femur and patella with no modifications; RvTA with two short branches, the more ventral branch is reduced and rounded, and the more dorsal branch is larger, with acute tip ( Figs 9DView FIGURE 9, 10DView FIGURE 10); RTA with wide base, shorter than the tibia and with acute tip ( Figs 9DView FIGURE 9, 10View FIGURE 10 D–E); cymbium oval ( Fig. 10EView FIGURE 10); tegulum with stout lobe curved to prolateral side ( Figs 9C, 9FView FIGURE 9, 10AView FIGURE 10); embolic disc with three processes very close together on its distal portion: two short and rounded distal process (dPED) and one short and triangular ventral process (vPED) ( Figs 9D, 9FView FIGURE 9, 10View FIGURE 10 A–B, 10D); embolic filament (ef) very short, approximately 1/5 the length of embolus shaft ( Figs 9FView FIGURE 9, 10View FIGURE 10 A–B). Color in alcohol ( Figs 9View FIGURE 9 A–B): cephalic area black with yellow setae near the eyes; thoracic area laterally black and centrally dark brown with yellow setae on median-posterior portion; abdomen dorsally variegated with black and dark brown, and with a longitudinal stripe of white setae; ventrally variegated with brown; legs I almost black and legs II–IV dark brown; tarsi pale in all legs.

Female. Unknown.

Note. The RvTA was interpreted herein as an apophysis with two branches ( Figs 9DView FIGURE 9, 10DView FIGURE 10). However, in other Amphidraus  species, such as A. araripe  sp. nov., these branches are not fused and therefore interpreted as two distinct apophyses: one RvTA and one ITA ( Figs 11FView FIGURE 11, 13BView FIGURE 13). The processes placed proximally on embolic disc and herein named as the pPED in A. sacrificatus  sp. nov. and A. boomerang  sp. nov. ( Figs 7CView FIGURE 7, 8AView FIGURE 8) are possibly homologous. However, in A. sacrificatus  sp. nov. it is linked to a heart-shaped membrane [ Figs 9C, 9FView FIGURE 9 (white arrow), 10A–B]. The homologies of all these structures across the genus need to be tested in future studies.

Distribution. Known only from the type locality (state of Pará, Brazil) ( Fig. 14View FIGURE 14).

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