Arauchemus miudo, 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 : 49-54

publication ID	https://doi.org/ 10.5281/zenodo.209775
DOI	https://doi.org/10.5281/zenodo.6170512
persistent identifier	https://treatment.plazi.org/id/CA0387F0-380E-FFD0-458F-FC4752CCF84C
treatment provided by	Plazi
scientific name	Arauchemus miudo
status	sp. nov.

Treatment

Arauchemus miudo View in CoL sp. nov.

Figs 1C, D View FIGURES 1 A – D ; 3; 6; 7B; 8B; 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 47642). Paratypes: 1 female, 07.VII.2001 (MCN 47650); 1 female, 02.II.2001 (MCN 47651); 5 males, 07.IV.2001 (MCN 47652); 1 female, 25.X.2000 (MCN 47653); 2 females, 14.IV.2001 (MCN 47654); 4 males, 07.IV.2001 (MCN 47655); 2 females, 02.II.2002 (MCN 47656); 1 female, 02.I.2001 (MCN 47657); 1 female, 02.I.2001 (MCN 47659); 5 males, 07.IV.2001 (MCN 47660); 2 males, 14.IV.2002 ( IBSP 160962); 1 male, 14.IV.2002 ( IBSP 160961); 1 female, 23.XI.2000 ( IBSP 160960); 1 female, 23.XI.2000 ( IBSP 160959); 2 males, 14.IV.2002 ( MCTP 30062); 1 female, 23.XI.2000 ( MCTP 30063); 1 female, 02.I.2001 ( MCTP 30064); all same locality and collector as holotype.

Other material examined: BRAZIL. Rio Grande do Sul: 62 males, 39 females, CPCN Pró-Mata, São Francisco de Paula, 25.X.2000 – 18.V.2002, R. Ott leg. (MCN 47693–47734); 172 males, 23 females, same data above ( MCTP 30118–30162); 13 males, 8 females same data above ( IBSP 161009 – 161020).

Etymology. The specific name is an adjective which in Brazilian slang means “small, less developed”.

Diagnosis. Males can be recognized by the long and coiled embolus ( Figs 1C, D View FIGURES 1 A – D ; 6A, B). Females by a wider than long epigynal plate with T-shaped atrium. ( Fig. 3F View FIGURES 3 A – G ).

Description. Male (holotype). Coloration as in A. graudo , but abdomen paler with brownish scutum and yellowish spinnerets. Total length 4.90. Carapace 2.10 long, 1.60 wide. Clypeus 0.10 high. Eye diameters and interdistances: AME 0.12, ALE 0.12, PME 0.10, PLE 0.12; AME–AME 0.04, AME–ALE touching, PME–PME 0.06, PME–PLE 0.06, ALE–PLE 0.04. Abdomen with anterodorsal scutum. Leg measurements: I – femur 1.90/ patella 1.20/ tibia 1.70/ metatarsus 1.50/ tarsus 0.80/ total 7.10/ II – 1.60/ 0.90/ 1.10/ 1.10/ 0.70/ 5.40; III – 1.50/ 0.60/ 0.90/ 1.10/ 0.60/ 4.70; IV – 1,70/ 0.70/ 1.20/ 1.70/ 0.70/ 6;00. Leg spination: femur I d0-1-1, p0-0-1, II d0-1-2, p0- 0-1, III d0-1-1, p0-0-1, r0-1-1, IV d0-1-1, p0-0-1, r0-0-1; patela III r1, IV r1, tibia II v0-1p-1p, III p1-1-0, r1-1-0, v1 p-2-2; IV p1-1-1, r1-1-1, v1 p-2-2, metatarsus I v1 v-0-0, II v1 r-0-0, III p1-1-1, r1-1-1-1, v0-2-0, IV p1-2-2, r1-2- 2, v2-2 -0. Embolus distally with large number of thorn-like processes ( Figs 6A–C View FIGURES 6 A – H ); small retrolateral triangular process at distal half of tibia ( Fig. 3C View FIGURES 3 A – G ).

Female (paratype MCN 47659). Coloration as in male. Total length 5.10. Carapace 1.80 long, 1.50 wide. Clypeus 0.08 high. Eye diameters and interdistances: AME 0.10, ALE 0.10, PME 0.10, PLE 0.10; AME–AME 0.04, AME–ALE touching, PME–PME 0.06, PME–PLE 0.06, ALE–PLE 0.04. Abdomen dorsal scutum absent. Leg measurements: I – femur 1.60/ patella 0.90/ tibia 1.10/ metatarsus 1.00/ tarsus 0.70/ total 5.30/ II – 1.20/ 0.70/.00/ 0.80/ 0.60/ 4.30/ III – 1.30/ 0.60/ 0.70/ 0.90/ 0.50/ 4.00/ IV – 1.50/ 0.70/ 1.10/ 1.30/ 0.60/ 5.20. Leg spination: femur I d1-1-1p, II d1-1-0, III d1-1-2, IV d1-1-1r, tibia II v0-1p-1p, III-IV p1-1-0, r 1-1-10, v1p-2-2, metatarsus II v2 -0-0, III p1-1-2, r1-1-2; v0-2-0, IV p1-1-2, r1-1-2, v1 p-2-0. Pedipalp: femur I d1-1, p1, patella p1, tíbia p1, r1-1. Tarsus d1, p1-1, r1, with ventral tuft of setae. Epigynum wider than long, with wide hood and conspicuous slit-like openings “Y” shaped copulatory opening areas ( Figs 3F, G View FIGURES 3 A – G ). Rounded and contiguous spermathecae ( Figs 3F, G View FIGURES 3 A – G ); copulatory ducts coiled forming large rounded sections; fertilization ducts very short in posterior half of spermathecae ( Fig. 3G View FIGURES 3 A – G ).

Variation. Males (72 specimens): total length 3.7–6.1; carapace 1.5–2.6; femora I 1.3–2.3. Females (10 specimens): total length 5.1–4.2; carapace 1.5–1.8; femora I 1.3–1.6.

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