Tryssaturus Hopkins, 1967

K, Harry Smit & PešićK, Vladimir, 2024, New records of notoaturine water mites from New Zealand, with the description of five new species (Acari: Hydrachnidia: Notoaturinae), Acarologia 64 (2), pp. 499-524 : 514

Genus Tryssaturus Hopkins, 1967

Diagnosis — Smit 2020, p. 413.

A genus with one species known from New Zealand. A second species is described below.

Remarks — Diagnosing genus Tryssaturus, Cook (1983) and later Smit (2020) stated that dorsal sclerites have a reticulate pattern, a character that is missing in the new species described in this paper. Moreover, the abovementioned authors stated that the female IV-leg-3

is with a distal extension with a short peg-like seta. In the female specimen collected in Caution

Creek, neither the distal extension nor the peg-like seta on IV-leg-2 are present, while the distal extension on IV-leg-2 is weakly developed. These differences induced us to give a revised diagnosis of this genus.

Revised diagnosis (after Smit 2020; modified) — Dorsum with an unpaired anteromedial and a posteromedial plate with two pairs of glandularia. Two pairs of laterodorsal platelets,

the anterolateral with one pair of glandularia, the posterolateral without glandularia. A pair of free glandularia present between the laterodorsal platelets and the posteromedial plate. Male without a distinct cauda. Coxae confined to anterior half of idiosoma. Posterior margins of

Cx-IV placed at right angles to midline; glandularia of Cxgl-4 well distanced from suture line Cx-III/IV. P2 with a few ventral denticles, P4 with mediodistal thickened seta. Legs not laterally compressed, without swimming setae. Male IV-leg modified: IV-leg-1 relatively long with numerous setae, IV-leg-2 with a distal extension, IV-leg with a large distal extension with a peg-like seta.