Arachnomura querandi Bustamante & Ruiz 2017, sp. nov.

Arachnomura querandi sp. nov.

Figs 8A, 9D, 10‒11

Note. This species was named “ Arachnomura cf. hieroglyphica ” in Ruiz & Maddison (2015).

Type material. Male holotype (UBC-SEM) from Reserva Natural Otamendi [34.224719°S, 58.896527°W], Provincia de Buenos Aires, Argentina, 28.XI.2001, G.B. Edwards & C.L. Scioscia leg. (voucher Amycoida d459); female paratype (UBC-SEM) with same collection data as the holotype.

Etymology. The specific name, a noun in apposition, is in honor of the Querandi people, who lived near the type locality.

Diagnosis. Males of Ar. querandi sp. nov. differ from those of Ar. hieroglyphica in having a longer embolus, 2025° (5T+225°) long in Ar. hieroglyphica (see Galiano 1977a: fig. 18) vs 2160° (6T) in Ar. querandi sp. nov. (Fig. 11A). Also, the RvTA in Ar. hieroglyphica is rounded (see Galiano 1977a: fig. 19). while in Ar. querandi sp. nov. it is slightly bilobed (Figs 11B‒11C).

Description. Male (holotype). Total length: 3.69. Carapace 1.80 long, 1.15 wide, 0.69 high. Ocular quadrangle 0.92 long. Anterior eye row 1.00 wide and posterior 1.04 wide. Chelicera paturon with one tricuspid promarginal tooth, and one bicuspid retromarginal tooth and spine-like setae on the frontal surface in and spine-like setae on the dorsal surface in scattered pattern (Fig. 8A). Length of femur (both legs I lost): II 0.77, III 0.75, IV 0.98; patella + tibia: II 0.92, III 0.81, IV 1.13; metatarsus + tarsus: II 0.73, III 0.81, IV 1.04. Expected leg formula (based on closely related Ar. hieroglyphica): 1423. Leg spination: femur II d1-1-1, p0, r0; III d0-1-1, p0, r0; IV d1- 1-1, p0, r0; patella II‒IV 0; tibia II p0, r0, v0-1r-1r; III 0; IV p0, r0, v1 pdi; metatarsus II v2-2; III p2di, r1di, v1 pdi; IV p2di, r1di, v1 pdi. Palp (Figs 11A‒11C): tibia wider than long, RvTA finger-like with slightly bilobed tip (Figs 11B‒11C), RTA wider than long and curved (Fig. 11C); embolus longer than wide, fixed to the tegulum, arising retrolaterally, with a path of 2160° before coiling to retrolateral side of the cymbium, where the tip of the embolus rests (Figs 11A‒11C). Color in alcohol: carapace light brown, with white scales directed forward (Fig. 10A), abdomen brown with white chevrons, sides white (Figs 10B, 10D, 10F). Chelicera, labium and sternum brown, endites light brown (Fig. 9D). Leg II‒III light brown; leg IV with darker spots on both sides of tibial and metatarsal tip, the remaining segments as leg II‒III (Figs 10A, 10C, 10E). Anterior spinnerets brown, posterior yellow (Fig. 10F).

Female. Total length: 4.08. Carapace 1.63 long, 1.01 wide, 0.67 high. Ocular quadrangle 0.86 long. Anterior and posterior eye row 0.96 wide. Chelicera paturon with one tricuspid promarginal tooth and one bicuspid retromarginal tooth. Length of femur: I 0.82, II 0.62 III 0.67, IV 0.89; patella + tibia: I 1.01, II 0.74, III 0.72, IV 1.03; metatarsus + tarsus: I 0.77, II 0.62, III 0.72, IV 0.94. Leg formula: 4132. Leg spination: femur I‒III d0-1-1 p0, r0, IV d1-1-1, p0, r0; patella I‒IV 0; tibia I p0, r0, v2 *-2a-1p; II p0, r0, v1 r-1r-0; III‒IV 0; metatarsus I v2-2; II v1 r-1p (v1 r-2 right); III p2di, r1di, v1 pdi; IV p2di, r1di, v1 pdi. Epigyne (Figs 11D‒11E): posterior edge unilobed, copulatory openings anteriorly placed. Color in alcohol: carapace and abdomen as in male, venter of the abdomen lighter. Legs as in male, but lighter (Figs 10G‒ 10I).

Distribution. Only known from Reserva Natural Otamendi, Argentina.