Acanthoctenus chickeringi, Arizala & Labarque & Polotow, 2021

Arizala, Stephany, Labarque, Facundo Martín & Polotow, Daniele, 2021, Revision of the Neotropical spider genus Acanthoctenus (Araneae: Ctenidae Acanthocteninae), Zootaxa 4920 (1), pp. 1-55: 39-43

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scientific name

Acanthoctenus chickeringi

sp. nov.

Acanthoctenus chickeringi   sp. nov.

Figs 10A View FIGURE 10 , 38–41 View FIGURE 38 View FIGURE 39 View FIGURE 40 View FIGURE 41

Type material. Female holotype from San Lorenzo , Fort Sherman, [9°21’45.4”N, 79°57’17.7”W], Panama. 15.VIII.1939, A.M. Chickering coll., deposited in MCZ; 1 male GoogleMaps   paratype, same data as the holotype, MCZ; 6 female GoogleMaps   paratypes, same data, MCZ GoogleMaps   .

Etymology. The specific name is a patronym in honor of Arthur Chickering, in recognition to his many contributions to the knowledge of Panamanian spiders.

Other material examined. PANAMA. Canal Zone : Barro Colorado Island, [9°09’15.2”N, 79°50’46.1”W], 1 female, VII.1954, A.M. Chickering coll. ( MCZ) GoogleMaps   ; same locality and collector, 1 female, VI.1950 ( MCZ) GoogleMaps   ; same locality and collector, 1 female, VII.1950 ( MCZ) GoogleMaps   ; same locality, 1 female, 30.XII.1935, Griswold coll. ( MCZ) GoogleMaps   ; France Field [9°20’53.2”N, 79°52’51.9”W], 1 female, 8.XI.1939, A.M. Chickering coll. ( MCZ) GoogleMaps   .

Diagnosis. Males of Acanthoctenus chickeringi   sp. nov. ( Figs 38 View FIGURE 38 D–E, 39A–B) resemble those of A. virginea   stat. res., comb. nov. ( Figs 31 View FIGURE 31 C–D, 32A–B) by the palpal tibia reduced, 1.5 times longer than wide. It can be distinguished by the RTA elongated, longer than wide, the embolus relatively wider, not bended basally, and palpal tibia not swollen basally. A. virginea   stat. res., comb. nov. presents a short, wider than long RTA, a relatively thinner embolus, which is bended basally, and a basally swollen palpal tibia. Females of Acanthoctenus chickeringi   sp. nov. ( Figs 39 View FIGURE 39 C–D, 40D, 41) resemble those of A. spinipes   ( Figs 16 View FIGURE 16 C–D, 17C, 18A–B) by the atrium massive, subquadrangular, as wide as long. It can be distinguished by the lateral borders of the atrium slightly sclerotized, the median sector extending into the atrium, and the copulatory ducts S-shaped, bended apically. A. spinipes   presents strongly sclerotized anterior and lateral borders of the atrium, no extension of the median sector into the atrium, and no apically bended copulatory ducts.

Description. Male (paratype MCZ). Total length 8.50. Carapace 4.37 long and 3.78 wide. Clypeus 0.23 high. Eye diameters: AME 0.28, ALE 0.21, PME 0.35, PLE 0.38. Leg measurements: I: femur 6.69/ patella 2.44/ tibia 7.86/ metatarsus 7.11/ tarsus1.93/ total 26.03; II: 5.25/ 2.26/ 5.75/ 4.71/ 1.35/ 19.32; III: 4.50/ 1.65/ 3.86/ 4.73/ 1.39/ 16.13; IV: 5.89/ 1.65/ 6.01/ 7.89/ 2.18/ 23.62. Leg formula 1423. Leg spination: tibia I, II v-2-2-2-2-2-2-2-2-2, p-1-1-0-1-1, r-1-0-1-1-1; III v-2-2-2, p-1-1-0-1, r-0-1-1-1, IV v-2-2-2, p-0-1-0-1, r-1-0-1; metatarsus I, II v2-2-2- 2-2, p-1-0-1-0, r-0-1-0-1, III v-2-2-2-2, p-1-1-0-1, r-0-1-1-1-1, IV v-2-2-2-2 p-1-0-1-1, r-1-1-1. Palp ( Figs 38 View FIGURE 38 D–E, 39A–B): tibia shorter than cymbium; RTA with large base, elongated and with blunt apex; cymbium elongated and with retrobasal projection; embolus elongated, cylindrical, and bent; conductor hyaline and following the tip of embolus; median apophysis laminar, elongated, narrow at the base and wider at the apex, with a proapical hook and retrolateral ridge.

Female (holotype MCZ). Total length 9.81. Carapace 4.66 long and 3.84 wide. Clypeus 0.27 high. Eye diameters: AME 0.28, ALE 0.21, PME 0.39, PLE 0.42. Leg measurements: I: femur 5.18/ patella 2.19/ tibia 5.65/ metatarsus 4.52/ tarsus1.34/ total 18.88; II: 4.72/ 2.04/ 4.38/ 3.96/ 1.23/ 16.33 III: 3.94/ 1.66/ 3.16/ 3.57/ 1.23/ 13.56; IV: 4.78/ 1.63/ 4.24/ 5.17/ 1.74/ 17.56. Leg formula 1432. Leg spination: tibia I v-2-2-2-2-2-2-2-2-2, p-1-0-1-1-1, r- 1-1-1-1-1; II v-2-2-2-2-2-2-2, p-1-1-1, r-0-1-1-1-1-1, III v-2-2-2, p-0-1-1, r-0-1-1-1, IV v-2-2-2, p-0-1-1, r-0-1-1-1; metatarsus I v2-2-2-2, p-0-1-0, r-0-1, II v2-2-2-2-2, p-0-1-1, r-0-1, III v-2-2-2, p-1-1-1, r-0-1-1, IV v-2-2-2 p-0-1-1, r-0-1-1. Epigynum ( Figs 39 View FIGURE 39 C–D, 40D, 41): median sector elongated, narrow anteriorly extending into the atrium, not projected posteriorly; anterior border of the lateral sectors slightly curved; 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. Five females: total length 8.38–10.34, carapace length 3.99–4.59.

Distribution. Panama ( Fig. 10A View FIGURE 10 ).


Museum of Comparative Zoology


Mykotektet, National Veterinary Institute