Ctenus serratipes F.O. Pickard-Cambridge 1897
Creators: name: Polotow, Daniele
name: Brescovit, Antonio D.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Ctenidae
Ctenus
Ctenus serratipes

description: Ctenus serratipes F.O. Pickard-Cambridge, 1897
Figs 4 A–D, 5A–C
Ctenus serratipes F.O. Pickard-Cambridge, 1897: 87, pl. 3, figs VI.c and VII.d (male holotype from Demerara, 6° 48'N, 58° 10'W, Demerara-Mahaica region, Guyana, deposited in BMNH, examined).
Ctenus fulvipes Caporiacco, 1947: 27 (male holotype from Great Falls, Demerara, 6° 48'N, 58° 10'W, Guyana, X.1931, Beccari & Romiti col., deposited in MZS, examined); Caporiacco 1948: 679, figs 98 – 99. New synonymy.
Ctenus scenicus Caporiacco, 1947: 28 (penultimate instar female syntype from Essequibo River, 6° 31'N, 58° 19'W, Essequibo Islands, West Demerara Region, Guyana and penultimate instar female syntype from Potaro River, Guyana, Beccari & Romiti col., deposited in MZS, examined); Caporiacco 1948: 680, fig. 100. New synonymy.
Ctenus itatiayaeformis Caporiacco, 1955: 394 (penultimate instar female holotype from Caracas, 10° 30'N, 66° 55'W, Venezuela, 15.I.1950, Foldats col., deposited in MUCV 806, examined). New synonymy.
Diagnosis. Males of Ctenus serratipes resemble those of C. paubrasil (Brescovit & Simó 2007: figs 31–32) by the shape of the laminar basal projection of the embolus, but can be distinguished by the thin retrolateral tibial apophysis, absence of tegular projection (Figs 4 A–B) and metatarsus IV modified (Figs 5 A–C). Females resemble those of Ctenus paubrasil (Brescovit & Simó 2007: figs 33–34) by the elongated anterior area of the epigynal median sector, but can be distinguished by the larger epigynal ovoid lobes and the shape of the lateral sector processes (Fig. 4 C).
Description. Male (MPEG 9007). Colouration: Carapace reddish brown, pars thoracica pale brown, thoracic groove dark brown; black rings around eyes; legs reddish brown, with ventral face of coxae and femora lighter; chelicerae reddish brown; endites and labium reddish brown, lighter at tips; sternum reddish brown; abdomen gray with several small black spots, covered with long hairs, with dorsal anterior light area and three pairs of black spots in dorsal median area; ventral abdomen with V-shaped darker area, from epigastric furrow to spinnerets, with two white spots near epigastric furrow. Total length 14.10. Carapace 7.80 long and 6.00 wide. Clypeus 0.44 high. Eye diameters: AME 0.47, ALE 0.26, PME 0.51, PLE 0.51. Chelicerae with 3 promarginal teeth, median larger; 4 retromarginal teeth, basal small; with intermarginal denticles. Leg measurements: I: femur 8.60/ patella 3.50/ tibia 8.90/ metatarsus 7.90/ tarsus 2.90/ total 31.80; II: 8.50/ 3.50/ 8.60/ 7.70/ 2.60/ 30.90; III: 7.00/ 2.90/ 5.90/ 6.50/ 2.30/ 24.60; IV: 8.90/ 3.10/ 8.50/ 9.40/ 3.90/ 33.80. Leg formula 4123. Leg spination: tibia I and II v2-2 -2-2-2, r1-1-0, p1-1-1-0, III and IV v2-2 -2, r1-1-0, p1-1-0; metatarsus I, II v2-2 -2, r1-1-0, p-1-1-0, III v2-2 -2, r1-1-1, p1-1-1; metatarsus IV modified (Figs 5 A–C). Palp: tibiae as long as cymbium; short retrolateral tibial apophysis on apical margin of tibia; RTA laminar, indented at tip; cymbium elongated, without basal projections; tegulum without projections; embolus with broad base, large tip, with laminar basal projection; median apophysis cup-shaped, bimarginated and short; conductor hyaline, C-shaped in retrolateral view (Figs 4 A–B).
Female (MPEG 9008). Colouration as in male. Total length 15.60. Carapace 7.80 long and 6.10 wide. Clypeus 0.38. Eye diameters: AME 0.35, ALE 0.28, PME 0.37, PLE 0.35. Chelicerae with 3 promarginal teeth, median larger; 4 retromarginal teeth, basal small; with intermarginal denticles. Leg measurements: I: femur 6.80/ patella 3.40/ tibia 6.40/ metatarsus 5.80/ tarsus 1.80/ total 24.20; II: 6.80/ 3.30/ 6.10/ 5.60/ 1.80/ 23.60; III: 5.70/ 2.70/ 4.50/ 5.20/ 1.80/ 19.90; IV: 7.10/ 2.70/ 6.40/ 8.40/ 2.60/ 27.20. Leg formula 4123. Leg spination: tibia I and II v2- 2 -2-2-2, r0, p0, III and IV v2-2 -2, r1-1, p1-1; metatarsus I, II v2-2 -2, r0, p0, III v2-2 -2, r1-1, p1-1, IV v1-1 -1-2-2, r1-1, p1-1. Epigynum: median sector subrectangular; with two ovoid lobes positioned longitudinally; median sector with swollen posterior area; ovoid lobes elongated; lateral spurs originating closer to the apex of the lateral sector (Fig. 4 C); spermathecae oval, with two small prolateral projections; copulatory ducts, long, large and narrow; fertilization duct short, originating from retrolateral side of spermathecae (Fig. 4 D).
Variation. 10 males: total length 14.1019.70; carapace 7.80–9.70 long; femur I 8.60– 10.30. 10 females: total length 15.60–20.20; carapace 7.80–11.30 long; femur I 6.80–9.30.
Additional material examined. BRAZIL. Pará: Juruti (2° 23' 60”S 56° 17' 60”W), 3 males and 19 females (MPEG 13919, 13924, 13929, 13932, 13933, 13937, 13964, 13975, 13989, 14009); (Comunidade Café Torrado, 2° 23' 60”S 56° 17' 60”W), 1 female (MPEG 13934); (Acampamento Mutum, 0 2o 36'11.2" S 56o12'36.3"W), 1 female (MPEG 8647); (Acampamento Barroso, 0 2o 28'10.5"S 56o00'3.5"W), 1 female (MPEG 8645); (02o28'22.1"S 56o12'29.4"W), 1 female (MPEG 13960); (02o28'22.1"S 56o12'29.4"W), 1 female (MPEG 13938); (Ramal Pacoval, Km 2, 0 2o 28'0.6"S 56o12'42.2"W), 1 male (MPEG 13949, 13998, 14003); (Sítio Três Irmãos, 0 2o 27'51.4"S 56o00'08.6"W), 2 males and 5 females (MPEG 9007, 9008, 13939, 13954, 13963, 14006); (Platô Carapiranga, 0 2o 28'22.1"S 56o12'29.4"W), 6 females (MPEG 8506, 9100, 13930, 13955, 13958, 13961); (Sítio Barroso, 0 2o 27'41.7"S 56o00'11.6"W), 2 males (MPEG 8643, 8646); (Vale do Igarapé Mutum, Platô do Rio Juruti, 0 1o 36'44.7"S 56o11'39.2"W), 2 males and 3 females (MPEG 8481, 8650, 9006, 9015, 13994).
Distribution. North of Guyana and north of the State of Pará, Brazil (Fig. 7).
description: Published as part of Polotow, Daniele & Brescovit, Antonio D., 2012, Redescription of five Amazonian species of Ctenus Walckenaer (Araneae, Ctenidae, Cteninae), pp. 49-59 in Zootaxa 3338 on pages 54-56, DOI: 10.11646/zootaxa.3338.1.3, http://zenodo.org/record/281372