Acanthoctenus manauara Arizala & Labarque & Polotow 2021, sp. nov.
Creators: name: Arizala, Stephany
name: Labarque, Facundo Martín
name: Polotow, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Ctenidae
Acanthoctenus
Acanthoctenus manauara

description: Acanthoctenus manauara sp. nov.
Figs 1–3, 10B, 44–47
Type material. Female holotype from Campus da Universidade Federal do Amazonas [3°05’53.3”S, 59°58’07.9”W], Manaus, state of Amazonas, Brazil, VIII.2011 – XII.2013, T. G. Carvalho, J.P.C. Pinto Neto & P.K.M. Almeida coll., deposited in CZPB AR126; male paratype from the same locality, 15.XII.2015, T. G. Carvalho coll., IBSP 233864.
Etymology. The species name is a word in Portuguese that identifies residents or natives from the city of Manaus.
Other material examined. BRAZIL. Amazonas: Manaus, Reserva Florestal Adolpho Ducke [2°57’48.0”S, 59°55’22.2”W], 1 female, 15.XII.1994, T. Gasnier coll. (IBSP 14528); Bosque da Ciência INPA, [3°05’50.8”S, 59°59’16.1”W], 1 female, 9.VIII.2018, DNA-voucher, S. Arizala coll. (IBSP 258333); Iranduba, Lago Janauari, 3°20’S, 60°17’W, 1 male, 14.I.1988, J. Adis et al. coll. (IBSP 120219); same locality and collectors, 1 female, 31.VIII.1987 (IBSP 120277); same locality and collectors, 1 male, 30.IX.1987 (IBSP 120218); Rio Preto da Eva, Fazenda Dimona, Reserva PDBFF, [2°21’S, 59°57’W], 1 male, 27.XII.2001, F.N.N. Rego coll. (IBSP 97263).
Diagnosis. Males of Acanthoctenus manauara sp. nov. (Figs 44 D–E, 45A–B) resemble those of A. gaujoni (Figs 22 D–E, 23A–B) by the palpal tibia elongated, at least 2.5 times longer than wide, and RTA elongated, longer than wide. It can be distinguished by the median apophysis basally thin, the apex more than 3 times wider than the base. A. gaujoni presents a suboval median apophysis, the apex 1.5 times wider than the base. Females of Acanthoctenus manauara sp. nov. (Figs 45 C–D, 46D, 47) resemble those of A. gaujoni (Figs 23 C–D, 24D, 25A–B) by the median sector subpentagonal, wide anteriorly, extending into the atrium, and the copulatory ducts bended apically. It can be distinguished by the lateral sectors’ anterior border forming a 40° angle with the median sector’s longitudinal axis, and the atrium with a single anterior border. A. gaujoni presents the anterior border of the lateral sectors forming a 60° angle with the median sector’s longitudinal axis, and divided anterior border in the atrium.
Description. Male (paratype IBSP 233864). Total length 7.93. Carapace 3.84 long and 3.29 wide. Clypeus 0.10 high. Eye diameters: AME 0.24, ALE 0.15, PME 0.28, PLE 0.32. Legs measurements: I: femur 5.98/ patella 1.82/ tibia 7.03/ metatarsus 6.41/ tarsus 1.91/ total 23.15; II: 5.13/ 1.87/ 4.89/ 5.33/1.63/ 18.85; III: 4.12/ 1.45/ 3.36/ 4.21/ 1.52/ 14.66; IV: 5.73/ 1.49/ 5.10/ 6.58/ 1.83/ 20.95. Leg formula:1423. Leg spination: tibia I and II v-2-2-2- 2-2-2-2-2-2, p-1-0-1-1-1, r-1-1-0-1-1, III and IV v-2-2-2, p-1-1-1, r-0-1-1-1; metatarsus I and II v-2-2-2-2-2, p-1- 0-1, r-0-1-1, III and IV v-2-2-2, p-1-1-1-1, r-1-1. Palp (Figs 44 D–E, 45A–B): tibia shorter than cymbium, slightly curved; RTA robust and elongated; cymbium elongated and with retrobasal projection; embolus elongated, cylindrical, and curved; conductor hyaline and following the tip of embolus; median apophysis laminar, elongated, narrow at the base and wider at the top, with a proapical hook and retrolateral ridge.
Female (holotype CZPB AR126). Total length 9.68. Carapace 3.95 long and 3.14 wide. Clypeus 0.28 high. Eye diameters: AME 0.25, ALE 0.19, PME 0.27, PLE 0.30. Leg measurements: I: femur 4.37/ patella 1.88/ tibia 4.81/ metatarsus 4.08/ tarsus 1.34/ total 16.48; II: 4.09/ 1.73/ 3.75/ 3.58/ 1.14/ 14.29; III: 3.38/ 1.27/ 2.59/ 2.80/ 1.21/ 11.25; IV: 3.95/ 1.20/ 3.58/ 3.88/ 1.59/ 14.2. Leg formula 1243. Leg spination: tibia I and II v-2-2-2-2-2-2-2-2-2, p- 1-1-1-1-1, r-0-1-1-0, III v-2-2-2, p-1-1-1, r-1-1-1, IV v-2-2-2, p-1-1, r-1-1; metatarsus I and II v2-2-2-2-2, p-1, r-1, III v-2-2-2, p-1-1-, r-1-1, IV v-2-2-2, p1-1-1, r-0-1-0. Epigynum (Figs 45 C–D, 46D, 47): median sector subpentagonal, wide anteriorly extending into the atrium, projected posteriorly; anterior border of the lateral sectors straight; atrium massive, subquadrangular; copulatory ducts bended apically, S-shaped; spermathecae head quote-shaped, with apical glandular openings, spermathecae base curled; fertilization ducts tubular, slanting outwards.
Variation: Four females: total body length 7.26–8.61, carapace length 2.47–4.38; two males: 7.70–8.72, 3.37 –4.16.
Natural history. Females of this species have been collected inside shelters under leaf sheath and dry leaves of palms and similar plants (Astrocaryum G. Mey; Attalea Kunt; Musa L.; and Mauritia L., Fig. 2B).
Distribution. Northern Brazil, state of Amazonas (Fig. 10B).
description: Published as part of Arizala, Stephany, Labarque, Facundo Martín & Polotow, Daniele, 2021, Revision of the Neotropical spider genus Acanthoctenus (Araneae: Ctenidae Acanthocteninae), pp. 1-55 in Zootaxa 4920 (1) on pages 46-50, DOI: 10.11646/zootaxa.4920.1.1, http://zenodo.org/record/4471454