Centroctenus alinahui, Brescovit & Torres & Rego & Polotow, 2020

Brescovit, Antonio D., Torres, Richard A., Rego, Felipe N. A. A. & Polotow, Daniele, 2020, Six new species of the spider genus Centroctenus Mello-Leitão from the Neotropical region (Ctenidae, Cteninae), Zootaxa 4877 (2), pp. 311-328 : 319-320

Centroctenus alinahui sp. n.

Figure 6 , 12C

Type material. Holotype male from Cabanas Aliñahui (01°02’19.2”S, 77°31’57.1”W), 450 masl, 20 km E Puerto Napo, Napo, Ecuador, IV/1994, V. Roth coll., deposited in CAS . Paratype male with same data, deposited in IBSP 250629.

Additional material examined. None.

Etymology. The species epithet is a noun in apposition taken from the type locality, Cabanas Aliñahui, in Ecuador.

Diagnosis. Centroctenus alinahui sp. n. resembles C. chalkidisi sp. n. by the shape of the copulatory bulb sclerites ( Fig. 8 B–D), but can be distinguished by the cymbium with prolateral border rounded, RTA distally flat and wide, with indented border and an internal branch with a small rounded projection ( Fig. 6 B–D).

Description. Male (holotype). Carapace orange, with cephalic area and lateral borders brown ( Fig. 6A ). Legs and palps orange, with coxae yellow. Chelicerae, labium and endites orange. Sternum yellow. Abdomen gray with an orange median dorsal folium, ventrally light gray. Total length 12. Carapace 6.5 long and 5.5 wide. Eye diameters: AME 0.16, ALE 0.12, PME 0.2, PLE 0.18. Chelicerae: promargin with 3 teeth, the median almost twice as high as the laterals; retromargin with 5, basal smaller than others. Leg measurements: I: femur 8.5/ patella 3.1/ tibia 8.8/ metatarsus 8.2/ tarsus 3.1/ total 31.7; II: 8/ 3.2/ 7.8/ 7.3/ 3.1/ 29.4; III: 7/ 2.7/ 6.1/ 7.1/ 2.4/ 25.3; IV: 9.1/ 3/ 8.4/ 11.5/ 2.8/ 34.8. Leg formula: 4123. Leg spination: tibia I-II v2-2-2-2-2, r1-1-0, p1-1-0, III-IV v2-2-2, r1-1-0, p1- 1-0; metatarsus I-IV v2-2-2, r1-1-1, p1-1-1. Palp ( Fig. 5 B–D): tibia approximately two times the cymbium length; cymbium oval, distally tapered; tegulum oval; embolus short, curved, with large base; median apophysis enlarged; conductor hyaline, located next to the tip of embolus.

Female. Unknown.

Distribution. Known only from the type locality ( Fig. 12C ).

Figures

FIGURE 5. Centroctenus coloso sp. n., female IBSP 250628. A female abdomen, dorsal view; B epigynum, ventral view; C, female internal genitalia, dorsal view. Abbreviations: CD, copulatory ducts; FD, fertilization ducts; LL, lateral lobes; MS, median sector of epigynum; S, spermathecae. Scale bars: A = 2 mm; B, C = 0.5 mm.

FIGURE 6. Centroctenus alinahui sp. n., male IBSP 250629. A habitus, dorsal view; B left male palp, ventral view; C same, detail, ventral view; D same, retrolateral view. Abbreviations: C, conductor; E, embolus; MA, median apophysis; RTA, retrolateral tibial apophysis. Scale bars: A = 2 mm; B, D = 1 mm; C = 0.5 mm.

FIGURE 8. Centroctenus chalkidisi sp. n., male IBSP 250630. A habitus, dorsal view; B left male palp, retrolateral view; C same, ventral view; D same, retrolateral view.Abbreviations: C, conductor; E, embolus; MA, median apophysis; RTA, retrolateral tibial apophysis. Scale bars: A = 2 mm; B, D = 1 mm; C = 0.5 mm.

FIGURE 12. Geographic distribution records of the species Centroctenus Mello-Leitão in South America.