Zoobank: 5B1BD8F6-2405-4291-B9F9-B7D14142504E

(Figures 9 A-C)

Material examined — Holotype female, Crique des Pères, 5.047681°N, 52.600785°W, 26 Jun. 2019, leg. S. Clavier (RMNH). Paratype: one female, Marais de Kaw-Roura National Reserve, French Guiana, 4.645064°N, 52.160725°W, 23 Jun. 2020, leg. S. Clavier, sequenced (BOLD: HYDME 039-22).

Diagnosis (Male unknown) — Cxgl-4 extending slightly anteriorly, acetabula well separated, pregenital sclerite slightly bowed and relatively short.

Description — Female – Idiosoma without plates or platelets, dorsally 851 long and 761 wide, ventrally 692 long. Coxae in three groups, anterior coxae posteriorly bluntly pointed. Cxgl-4 extending slightly anteriorly (Figure 9A). Genital field 188 long, with three pairs of wellseparated acetabula; pregenital sclerite slightly bowed, 82 wide. Acetabula surrounded by a small fringe of secondary sclerotization. Length of P1-5: 28, 94, 56, 98, 38. P2 anteroventrally with two denticles; P3 without denticles; P4 ventrally with two fine setae, unequal in size (Figure 9B). Length of I-leg-4-6: 138, 152, 124. I-leg-5 anteroventrally with two pointed setae, unequal in size (Figure 9C). Length of IV-leg-4-6: 184, 192, 156. Swimming setae absent.

Etymology — Named for its occurrence in the Guianas.

Discussion — Most similar in the shape of the genital field and palp H is. pachydermis Lundblad, 1936 from Brazil. The latter species has Cxgl-4 shifted much more anteriorly, the pregenital sclerite is larger and strongly bowed and the anterior coxae are less broad. The female of H. rufus Lundblad, 1937 from Brazil is unknown, but P4 of this species is stockier compared to the new species.