Arauchemus graudo, Ott, Ricardo & Brescovit, Antonio Domingos, 2012

Ott, Ricardo & Brescovit, Antonio Domingos, 2012, Arauchemus, a new spider genus of the Echemus group (Araneae: Gnaphosidae: Echeminae) from Araucaria Forest areas in southern Brazil, with notes on habitat preferences and phenology, Zootaxa 3339, pp. 44-56 : 47-49

publication ID	https://doi.org/ 10.5281/zenodo.209775
DOI	https://doi.org/10.5281/zenodo.6170510
persistent identifier	https://treatment.plazi.org/id/CA0387F0-3808-FFDF-458F-F9DF52CCFC9F
treatment provided by	Plazi
scientific name	Arauchemus graudo
status	sp. nov.

Treatment

Arauchemus graudo View in CoL sp. nov.

Figs 1A, B View FIGURES 1 A – D ; 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 View FIGURES 1 A – D ; 4B, C). Females by the epigynal plate as long as wide with short posterior septum ( Figs. 2F–G View FIGURES 2 A – 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 View FIGURES 4 A – H ); small triangular process at dorsal base of retrolateral tibial apophysis ( Fig. 2C View FIGURES 2 A – G ).

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 View FIGURES 2 A – G ). Rounded spermathecae separated from each other around 1/3 of their diameter ( Fig. 2F View FIGURES 2 A – G ); copulatory ducts coiled forming large oval sections; fertilization ducts in anterior half of spermathecae ( Fig. 2G View FIGURES 2 A – G ).

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.