Arauchemus miudo Ott & Brescovit, 2012, sp. nov.
Creators: name: Ott, Ricardo
name: Brescovit, Antonio Domingos
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Gnaphosidae
Arauchemus
Arauchemus miudo

description: Arauchemus miudo sp. nov.
Figs 1C, 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; 6A, B). Females by a wider than long epigynal plate with T-shaped atrium. (Fig. 3F).
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); small retrolateral triangular process at distal half of tibia (Fig. 3C).
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). Rounded and contiguous spermathecae (Figs 3F, G); copulatory ducts coiled forming large rounded sections; fertilization ducts very short in posterior half of spermathecae (Fig. 3G).
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.
description: Published as part of 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, pp. 44-56 in Zootaxa 3339 on pages 49-54, DOI: 10.5281/zenodo.209775