Forelia (Forelia) gereckei, Pešic & Smit, 2016

Pešic, V. & Smit, H., 2016, New records of water mites from Southeast Asia (Acari: Hydrachnidia) with the description of two new genera and 12 new species, Acarologia 56 (3), pp. 393-433 : 412

publication ID 10.1051/acarologia/20162251

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Forelia (Forelia) gereckei

n. sp.

Forelia (Forelia) gereckei n. sp.

( Figure 12 View FIGURE )

Type material — Holotype female, dissected and slide mounted, Laos, 15-32-1, Kouangxi Waterfall , pond behind a artificial barrier within a branch near the main brook, 19°44’56"N, 101°59’33"E, alt. ca. 490 m a.s.l., water depth 0.4 m, substrate: travertine mud covered by a thick layer of leaves, 21.iv.2015 GoogleMaps . Paratypes: 0/2/0, same data as holotype.

Diagnosis — (Male unknown). Anterior margin of idiosoma medially concave; genital plates with 13-16 pairs of acetabula; ventral margin of P-4 without setal tubercles, with setae located close to each and a blunt, peg-like mediodistal setal; leg claw and clawlet blunt.

Description — Female: Colour yellow with brown markings; anterior margin of idiosoma medially concave or straight, dorsum with three pairs of platelets, anterior platelets oblong, central platelets slightly more lateral and irregularly rounded, posterior platelets small, close to each other ( Figure 12A View FIGURE ). Genital plates slightly extended anteriorly with 13-16 pairs of acetabula, medial margin straight or slightly concave, pregenital sclerite large; excretory pore on platelet. P-4 stocky, ventral margin of P-4 with setae located close to each other, without setal tubercles ( Figures 12 View FIGURE C-D), distal margin with a short blunt seta; P-5 around 70 % L of P-4. Legs: number of swimming hairs: II-L- 4, 3; II-L-5, 4; III-L-4, 4; III-L-5, 6; IV-L-4, 3; IV-L-5, 5; claws of I-L large, claw and clawlet blunt.

Measurements — Idiosoma L/W 709/530; coxal field L/W 267/400; genital plate L/W 109-113/78; gonopore L 134, pregenital sclerite W 78; egg maximum diameter (n – 2) 147. Palp: total L 236, dL/H, dL/H ratio: P-1, 27/34, 0.78; P-2, 69/41, 1.68; P-3, 37/33, 1.12; P-4, 60/25, 2.4; P-5, 43/19, 2.3; dL ratio P-2/P-4, 1.15; gnathosoma (with posterior anchoral process) vL 93; chelicera total L 122, claw L 38, basal segment L 84, L basal segment/claw ratio 2.2. Legs: dL of I-L: 45, 43, 55, 61, 66, 89; dL/H I-L-6 ratio 2.8.

Etymology — Named after Reinhard Gerecke (Tübingen) in appreciation of his studies of water mites.

Remarks — Due to the similar morphology of the dorsum (three pairs of platelets), genital plates (medial margin extended anteriorly) and palp (P- 4 without setal tubercles) the specimens from Laos resemble Forelia flexipoda Jin, 1995 from Guizhou, China. The latter species differs in larger dimensions of idiosoma and palps, medially projecting anterior margin of idiosoma, a very small mediodistal peg-like seta of P-4, claws of I-L pointed (Jin 1999: figure 9) and in the increased number of acetabula (26-27 pairs, from Jin 1995).

Distribution — Laos; known only from the locus typicus ( Figure 25B View FIGURE ).