Arrenurus (Micruracarus) thailandicus, Smit, 2017

Smit, Harry, 2017, New records of water mites from standing waters in Thailand, with the description of nine new species (Acari: Hydrachnidia), Zootaxa 4312 (1), pp. 69-91 : 89-90

Arrenurus (Micruracarus) thailandicus n. sp.

( Fig. 11 )

Material examined. Holotype male, swamp Kaeng Leang Chan , Maha Sarakham Province, 16° 11.469ʹ N, 103° 12.413ʹ E, 2-xi-2016 ( RMNH).

Diagnosis. Dorsal shield incomplete, strongly narrowed posteriorly; petiole rudimentary, short bar-shaped.

Description. Male: Idiosoma greenish, dorsal length 571, width 428. Dorsal shield incomplete, 251 wide, strongly narrowed posteriorly. Dorsal shield with two pairs of glandularia and postocularia. Cauda short with an open medial cleft, posterior margin of cauda with a pair of shallow indentations. Posterior to the dorsal shield a rudimentary bar-shaped petiole flanked by a pair of short setae. First coxae not extending beyond anterior idiosoma margin. Medial margin of fourth coxae longer than medial margin of third coxae. Gonopore 30 long; genital plates long and narrow, indistinct, curving anteriorly and almost extending to lateral idiosoma margin. Palp typical but with two long distal dorsal P2 setae approximately the combined dorsal length of P2+P3. Length of P1–5: 24, 44, 28, 42, 29. Length of I-leg-4–6: 90, 96, 120. IV-Leg-4–6: 112, 122, 120, IV-leg-4 with a long spur. Third and fourth legs with numerous swimming setae.

Female: Unknown.

Etymology. Named after the country where the new species was found.

Remarks. The new species is similar to A. madaraszi Daday, 1898 but the latter species has a complete, rounded dorsal shield.

Figures

FIGURE 11. Arrenurus thailandicus n. sp., holotype male. A = dorsum; B = venter; C = palp. Scale bars = 50 µm.