Hypaeus poseidon sp. nov.

Figs 24–35, 38, 65

Types. Holotype: male from Parque Nacional da Serra do Pardo (5.877806°S, 52.795389°W), São Félix do Xingu, Pará, Brazil, 28.IV.2012, G.R.S. Ruiz et al. (MPEG 21126). Paratype: one female, same data as holotype, except for (5.808917°S 52.716111°W), 20.IV.2012 (MPEG 21128).

Etymology. The epithet in apposition is in honor of the Greek mythological figure, referring to three projections on the male palpal tibia, resembling Poseidon’s trident.

Diagnosis. Males of H. poseidon sp. nov. are similar to those of H. annulifer Simon and H. tridactylus sp. nov. for having three projections on the palpal tibia: RTA, RvTA and PvTA [male of H. pauciaculeis (Caporiacco) is still unknown]. However, they can be distinguished from those of H. annulifer for the slender RTA forming a stronger hook (Fig. 29) and from H. tridactylus sp. nov. for the median portion of the embolus, more straight and less flat in this species (see arrows in Figs 16, 27). Females of H. poseidon sp. nov. are similar to those of H. tridactylus sp. nov. and H. pauciaculeis (Caporiacco) in having the double pocket (female of H. annulifer is still unknown). They differ from those of H. tridactylus sp. nov. for the posterior position of the pockets (Fig. 33) and from H. pauciaculeis for the compact structure of the copulation ducts, occupying a portion narrower than the distance between the copulation openings (Fig. 35; compare with Ruiz & Brescovit 2008, figs 5–6).

Description. Male (holotype, MPEG 21126). Total length: 5.50. Carapace light brown with darker cephalic region and a dark crescent on posterior border, 2.80 long, 1.90 wide, 1.50 high. Ocular quadrangle 1.55 long. Anterior eye row 1.90 wide, posterior 1.70 wide. Brown eyebrow. White setae behind the fovea and joining ALE and PLE (Fig. 30). AME 0.70 in diameter. Clypeus 0.35 high, slightly darker with sparse white setae (Fig. 24). Chelicera light brown, slightly concave, with a small acute mastidion, four teeth on promargin, three on retromargin. Labium and endite light brown. Sternum yellow. Palp: femur ventrally curved; tibia with ventrally curved RTA forming a hook, a thick, elongated and rounded RvTA, and a round, conical PvTA; embolus arising from retrolateral side of tegulum, curved, with straight medial portion (on prolateral side) (Figs 26–29). Legs 1342 (7.70/6.05/7.10/6.50). Coxae and trochanters yellow. Femora yellow with dark brown distal part, lighter in posterior legs, darker at joints. Patella and tibia I dark brown, lighter in posterior legs. Metatarsi and tarsi yellow. Length of femur I 2.20, II 1.95, III 2.50, IV 2.10. Patella + tibia I 3.10, II 2.35, III 2.40, IV 2.20. Metatarsus + tarsus I 2.40, II 1.75, III 2.20, IV 2.20. Abdomen dorsally with dark brown pattern leaving pairs of pale spots (Fig. 30); pale ventrally with inconspicuous color pattern. Spinnerets light brown.

Female (paratype, MPEG 21128). Total length: 6.75. Carapace yellow, 3.20 long, 2.25 wide, 1.70 high, with scarce white setae (Fig. 31). Ocular quadrangle 1.65 long. Anterior eye row 2.10 wide, posterior 1.90 wide. No eyebrow. AME 0.75 in diameter. Clypeus 0.25 high. Chelicera yellow, with no mastidion (Fig. 32), four teeth on both promargin and retromargin. Labium, endite and sternum yellow. Legs 3412 (7.95/7.45/7.30/6.35), yellow. Length of femur I 2.30, II 2.10, III 2.85, IV 2.55. Patella + tibia I 3.00, II 2.50, III 2.70, IV 2.50. Metatarsus + tarsus I 2.00, II 1.75, III 2.40, IV 2.40. Abdomen as in male. Epigyne with separate pockets and large copulation openings (Figs 33–34); internally with digitiform glands and long sinuous copulation ducts leading to anterior spermathecae (Figs 35, 38). Spinnerets yellow.

Distribution. Known only from the type locality (Fig. 65).