Arauchemus graudo Ott & Brescovit, 2012, sp. nov.

Arauchemus graudo sp. nov.

Figs 1A, B; 2; 4; 5; 7A; 8A; 9

Type material. Holotype: male from CPCN Pró-Mata, Potreiro Velho, São Francisco de Paula, Rio Grande do Sul, Brazil, 07.IV.2001, R. Ott leg. (MCN 47641). Paratypes: 1 male, 3 females, 07.IV.2001 (MCN 47643); 1 female, 09.VIII.2001 (MCN 47644); 2 females, 13.XI.2001 (MCN 47645); 2 females, 14.IV.2002 (MCN 47646); 2 males, 01.V.2001 (MCN 47647); 2 males, 07.IV.2001 (MCN 47648); 2 females, 25.XI.2000 (MCN 47649); 1 females, 25.X.2000 (MCN 47658); 1 male, 14.IV.2002 (IBSP 160963); 1 male, 07.IV.2001 (IBSP 160964); 1 female, data as holotype, 02.I.2001 (IBSP 160965); 1 female, 02.I.2001 (IBSP 160966); 2 males, 14.IV.2002 (MCTP 30060); 2 females, 18.V.2002 (MCTP 30061); all same locality and collector as holotype.

Other material examined: BRAZIL. Rio Grande do Sul: 13 males, 10 females, CPCN Pró-Mata, São Francisco de Paula, 25.X.2000 – 18.V.2002, R. Ott leg. (MCN 47661–47680); 51 males, 81 females, same data above (MCTP 8976–8981; 30069–30117); 12 males, 10 females, same data above (IBSP 161021 – 161032).

Etymology. The specific name is an adjective which in Brazilian slang means “large, well developed”. Diagnosis. Males can be recognized by the short, curved and stout embolus (Figs. 1A, B; 4B, C). Females by the epigynal plate as long as wide with short posterior septum (Figs. 2F–G).

Description. Male (holotype). Carapace, chelicerae, endites, labium, sternum and legs orange-brown. Abdomen grayish with darker anterodorsal scutum; pale orange spinnerets.

Total length 6.3. Carapace 2.7 long, 2.2 wide. Clypeus 0.12 high. Eye diameters and interdistances: AME 0.16, ALE 0.16, PME 0.14, PLE 0.16; AME–AME 0.04, AME–ALE touching, PME–PME 0.08, PME–PLE 0.08, ALE–PLE 0.06. Abdomen with oval anterior dorsal scutum. Leg measurements: I – femur 2.2/ patella 1.5/ tibia 2.1/ metatarsus 1.7/ tarsus 1.1/ total 8.6/ II – 1.9/ 1.2/ 1.5/ 1.4/ 1.0/ 7.0/ III – 1.8/ 1.0/ 1.3/ 1.4/ 0.8/ 6.3/ IV – 2.3/ 1.0/ 1.8/ 2.2/ 0.8/ 8.1. Leg spination: femur I d1-1-0, p0-0-1, II d1-1-0, p0-0-1, III d1-1-1, p0-0-1, r1-1-1, IV d0-1- 1, p0-0-1, r0-0-1; patela III r1, IV r1, tibia I v1 p-1p-1p, II v0-2-1p, III d1-1-0, p1-2-1-1-1, r1-1-1, v2-3 -3-2; IV d1- 2-1-1, p1-1-0, r1-1-0, v1 p-3-2-2, metatarsus I v0-2-0, II v0-2-0, III d0-2-2, p2-2-1-1-1, r1-1-1, v2-2 -0, IV d0-2-2, p1-1-1-1, r1-1-2-1-1-2, v0-2-1-2. Palp with short, robust embolus with distal, small, thorn-like processes (Figs 4A–C); small triangular process at dorsal base of retrolateral tibial apophysis (Fig. 2C).

Female (paratype MCN 47658). Coloration as in male. Total length 7.5. Carapace 4.8 long, 2.8 wide. Clypeus 0.12 high. Eye diameters and interdistances: AME 0.16, ALE 0.14, PME 0.14, PLE 0.14; AME–AME 0.04, AME–ALE touching, PME–PME 0.10, PME–PLE 0.08, ALE–PLE 0.06. Abdomen dorsal scutum absent. Leg measurements: I – femur 2.4/ patella 1.6/ tibia 1.8/ metatarsus 1.5/ tarsus 1.0/ total 8.30/ II – 2.3/ 1.5/ 1.6/ 1.6/ 1.0/ 8.0/ III – 1.8/ 1.0/ 1.1/ 1.6/ 0.8/ 6.3/ IV – 2.6/ 1.4/ 2.0/ 2.3/ 1.0/ 9.3. Leg spination: femur I d1-1-0, p1-1-0, II d0-1-1, d1-1-0, III d1-1-2, p0-1-1, r0-1-1, IV d1-1-1, p0-0-1, r0-0-1, tibia I v0-1p-0, II v0-2-1p, III p1-1-1, r0-1-0, 1p-2-2, d1-0-0, IV p1-1-0, r1-2-2, v2-2 -2, metatarsus I –II v0-2-0, III p1-2-2, r1-1-2; v0-2-0, IV p1-1-1, r2-2-2, v2- 2 -0. Pedipalp: femur I d1-1, p1, patella p1, tíbia p1, r1-1, tarsus d1, p1-1, r1. Epigynum with small anterior hood and short median posterior septum (Fig. 2F). Rounded spermathecae separated from each other around 1/3 of their diameter (Fig. 2F); copulatory ducts coiled forming large oval sections; fertilization ducts in anterior half of spermathecae (Fig. 2G).

Variation. Males (72 specimens): total length 4.5–7.6; carapace 1.9–3.2; femora I 1.7–2.9. Females (10 specimens): total length 6.2–7.7; carapace 2.4–3.8; femora I 1.8–2.4.

Distribution. Known only from the type locality in the state of Rio Grande do Sul, Brazil.