Omartacarus (Omartacarus) sautensis 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 : 1128-1129

Omartacarus (Omartacarus) sautensis Smit & Pešić sp. nov.

Zoobank: B8CB7AFF-BE25-41C2-9844-5ABD4C6A4350

( Figures 5A–E)

Material examined — Holotype male, Petit-Saut Lake , French Guiana, date unknown,

between 2007 and 2017, 4.939997°N, 53.044167°W, leg. S. Clavier ( RMNH). Paratype: Same data as holotype ( RMNH).

Diagnosis — Suture line between Cx-III and Cx-IV very characteristic, with Cx-III not reaching midline of venter.

Description — Male – Idiosoma dorsally 648 long and 535 wide, ventrally 689 long (but these measurements are an indication only as the integument is very soft). Dorsum without plates or platelets. Gnathosoma compact, 154 long and 127 high, rostrum relatively short with indistinct annulations, at least in lateral view ( Figure 5B). Suture line between Cx-I and Cx-II incomplete. Suture line between Cx-III and Cx-IV very characteristic, with Cx-III medially not reaching midline of venter ( Figure 5A). Genital field 120 long and 101 wide, with 15-16 pairs of acetabula; gonopore 42 long, narrowed anteriorly. Length of P1-5: 42, 122, 86, 130, 91 (P2 and

P3 measured from the other palp). P4 ventrally with a tooth-like seta in the middle of segment ( Figure 5C). Length of I-leg-4-6: 150, 176, 128 (till tip of segment). I-leg-5 anteroventrally with two long thin setae (but these are not swimming setae, figure 5D). Length of IV-leg-4-6: 219, 251, 184. Legs without swimming setae.

Female: Idiosoma dorsally 810 long and 753 wide, ventrally 859 long (but these measurements are an indication only as the integument is very soft). Dorsum without plates or platelets. Gnathosoma compact, 196 long and 120 high, rostrum relatively short with annulations. Coxae as in male, coxal field 259 long and 275 wide. Genital field 156 long, genital plates 116 long, the latter nearly as long as gonopore, with approximately 21 pairs of acetabula ( Figure 5E). Length of P1-5: 34, 130, 64, 153, 96 (P4 measured from the other palp). Palp as in male. Length of I-leg-4-6: 156, 178, 136. Length of IV-leg-4-6: 210, 251, 200.

Etymology — Named after the type locality.

Discussion — The shape of the suture line between Cx-III and Cx-IV is not found in any other Omartacarus species. Moreover, a tooth-like seta in the middle of P4 is not found in other Omartacarus species. The genus Omartacarus is typically an interstitial species. Although the type locality is a lake, the collection has probably been made in an area near the dam with some subterranean influence.