Atractides courciboensis Smit & Pešić, 2022

K, Harry Smit, Pešić, Vladimir, K & K, Simon Clavier, 2022, Water mites from French Guiana, with the description of 14 new species (Acari: Hydrachnidia), Acarologia 62 (4), pp. 1119-1153 : 1129-1131

Atractides courciboensis Smit & Pešić sp. nov.

Zoobank: ACDFED70-BA76-4434-BCE2-C0BB0058A361

( Figures 6 A-D)

Material examined — Holotype female, National Reserve La Trinité / Parc Amazonien de Guyane, Courcibo River, French Guiana, 4.475657°N, 53.219474°W, 14 Nov. 2020, leg. S. Clavier, dissected and slide mounted ( MNHN).

Diagnosis (Male unknown) — Gonopore long; I-leg-5 setae S-1 and S-2 close to each other, S-1 slender with truncate tip, S-2 pointed, basally enlarged, I-leg-6 curved, dorsal length/central height ratio 5.4.

Description — Female – Integument striated, muscle insertions unsclerotized. Mediocaudal margin Cx-I convex, apodemes of Cx-II in an obtuse angle ( Figure 6A). Acetabula in a weakly curved line, gonopore long, pregen large ( Figure 6B). Excretory pore smooth; Vgl-1 not fused to Vgl-2. Palps: ventral margin P2 straight, with slightly curved distal margin, ventral margin P3 slightly concave, P4 sword seta between ventral setae, nearer to distoventral hair ( Figure 6C). Legs: I-leg-5 thickened with setae S-1 and S-2 close to each other, S-1 slender, with obtuse tip, S-2 pointed, proximally enlarged; I-leg-6 stout, curved, proximally slightly thickened, with parallel dorsal and ventral margins from the centre to the claw pit ( Figure 6D).

Measurements. Idiosoma 525 long and 409 wide. Coxal shield 209 long; Cx-III 302 wide, medial length of Cx-I+II 83, lateral length of Cx-I+II 145. Genital field 125 long and 125 wide, genital plates 63-70 long, pregenital sclerite 70 wide, gonopore 108 long, length of Ac-1-3:

20-26, 20, 20-21. Eggs (n = 2) maximum diameter 119-128.

Palp: dorsal length/height, dorsal length/height ratio: P1, 22/23, 0.97; P2, 45/28, 1.6; P3,

61/27, 2.3; P4, 70/20, 3.5; P5, 26/11, 2.4; length ratio P2/P4, 0.64. Gnathosoma ventrally 70

long; chelicera 144 long.

Legs – I-leg-5 dorsal length 138, ventral length 102, dorsal length/ventral length ratio 1.35, maximum height 48, dorsal length/maximum H 2.9, S-1 long 67, length/width ratio 8.3, S-2

long 63, length/width ratio 5.0, distance S-1-2, 8, dorsal length S-1/2 ratio 1.08; I-leg-6 dorsal length 84, central height 16, dorsal length/central height ratio 5.4; dorsal length I-leg-5/6 ratio 1.6.

Male – Unknown.

Etymology — Named after the Courcibo River.

Discussion — The new species from French Guiana most resembles A. crassitarsis ( Lundblad, 1942) , a species originally described from southern Brazil ( Lundblad 1942) on the basis of a female, and later on reported by Cook (1980) with a question mark from a small stream in Mexico. From the new species, A. crassitarsis can be separated by the comparatively shorter gonopore and stouter I-leg-6 (see Figures 45 A and –C in Lundblad 1942).