Hypaeus tridactylus sp. nov.

Figs 12–23, 36–37, 65

Types. Holotype: male from Acampamento Mutum (2.551917°S, 56.224722°W), Juruti, Pará, Brazil, 20.II.2011, B.V.B. Rodrigues (MPEG 21523). Paratypes: one female from Acampamento Mutum (2.551917°S, 56.224722°W), Juruti, Brazil, 11.VIII.2010, N.C. Bastos (MPEG 21510); one male from Acampamento Mutum (2.551917°S, 56.224917°W), 10.I.2012, N.C. Bastos (MPEG 21521); one female from Beneficiamento (2.507611°S, 56.177639°W), 12.VIII.2010, N.C. Bastos (MPEG 21509).

Additional material examined. BRAZIL. Pará: Juruti: Acampamento Mutum (2.612417°S, 56.194222°W): 1♂, 19.VIII.2011, R. Saturnino (MPEG 21518); 2♀, 20.XI.2007, D.F. Candiani (MPEG 21212); (2.551917°S, 56.224917°W): 1♀, 11.VIII.2010, N.C. Bastos (MPEG 21511); (2.553833°S, 56.222806°W): 1♀, 11.V.2010, N.C. Bastos (MPEG 21515); (2.555°S, 56.222889°W): 2♂ 1♀, 20.VIII.2011, E.G. Cafofo (MPEG 21517, 21519, 21514); Beneficiamento (2.507611°S, 56.177639°W): 1♂ 1♀, 09.I.2012, N.C. Bastos (MPEG 21522, 21513); 1♂, 12.VIII.2010, B.V.B. Rodrigues (MPEG 21520); Estrada Plot 2 (2.612556°S, 56.190972°W): 1♀, 06.IX.2002, D.D. Guimarães (MPEG 21295); 1♀, 10.IX.2002, D.D. Guimarães (MPEG 21294).

Etymology. The epithet, to be treated as a Latin adjective, refers to the three projections on the male palpal tibia (RTA, RvTA and PvTA; Figs 16–17).

Diagnosis. Males of H. tridactylus sp. nov. are similar to those of H. annulifer Simon and H. poseidon sp. nov. for having three projections on the palpal tibia [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. 17) and from H. poseidon sp. nov. for the median portion of the embolus, flatter in this species (see arrows in Figs 16, 27). Females of H. tridactylus sp. nov. are similar to those of H. poseidon sp. nov. and H. pauciaculeis in having the double pocket (female of H. annulifer is still unknown). However, they differ from those species by having juxtaposed pockets occupying an anterior position on the epigynal plate (Fig. 19).

Description. Male (holotype, MPEG 21523). Total length: 6.50. Carapace orangish brown, 3.00 long, 2.20 wide, 1.80 high. Ocular quadrangle 1.85 long. Anterior eye row 2.10 wide, posterior 1.90 wide. Brown eyebrow (Fig. 12). White setae joining ALE and PLE, scarce white setae behind fovea. AME 0.70 in diameter. Clypeus slightly darker, 0.50 high, with scarce white setae (Fig. 22). Chelicera brown, frontal face slightly concave, bearing a lateral short and acute mastidion, slightly curved distally (Fig. 23), and four teeth on promargin and retromargin. Labium brown. Endite inflated, brown. Sternum yellow (Fig. 14). Palp: femur ventrally curved; tibia with ventrally curved RTA forming a hook, a thick, elongated and rounded RvTA, and a round, conical PvTA (Figs 16–17); embolus arising from retrolateral side of tegulum, with a prolateral lamella. Legs 1342 (>9.10/8.60/7.60/7.30). Coxae and trochanters yellow. Femora yellow, except the first, dark brown. Patellae and tibiae light brown, darker at joints, lighter in posterior legs. Metatarsus and tarsus light brown. Length of femur I 2.90, II 2.30, III 3.10, IV 2.60. Patella + tibia I 4.10, II 2.90, III 2.90, IV 2.60. Metatarsus + tarsus I? (broken), II 2.10, III 2.60, IV 2.40. Abdomen pale with inconspicuous dark pattern (with three pairs of white spots) (Fig. 12); ventrally pale. Spinnerets light brown.

Female (paratype MPEG 21510). Total length: 6.50. Carapace orange, 3.00 long, 2.20 wide, 1.70 high. Ocular quadrangle 1.85 long. Anterior eye row 2.10 wide, posterior 1.85 wide. Sparse white setae between ALE and PLE. Eyebrow absent (Fig. 13). AME 0.70 in diameter. Clypeus 0.20 high, orange. Chelicera orange with four teeth on promargin and five on retromargin. Labium, endite and sternum yellow (Fig. 15). Palp yellow. Legs 3412 (7.85/7.15/7.00/6.10) orange/yellow. Length of femur I 2.20, II 2.00, III 2.90, IV 2.45. Patella + tibia I 2.90, II 2.40, III 2.65, IV 2.40. Metatarsus + tarsus I 1.90, II 1.70, III 2.30, IV 2.30. Abdomen as in male, with stronger dark brown pattern (Fig. 13). Epigyne with juxtaposed pockets advanced on the plate (Fig. 19); rounded copulation openings; internally with digitiform glands and long sinuous copulation ducts leading to anterior spermathecae (Figs 36–37). Spinnerets light brown.

Variation. Male. Total length: 5.22–6.65. Carapace length: 2.80–3.18. Length of leg I 7.60–9.97. Female. Total length: 6.41–7.79. Carapace length: 2.51–3.13. Length of leg I: 5.55–7.31.

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