Hexaxanopsis monouncata, Smit, 2016

Smit, H., 2016, The water mite family Aturidae Thor, 1900 from Southeast Asia (Acari: Hydrachnidia) with the description of one new genus and 14 new species, Acarologia 56 (3), pp. 341-365 : 346-349

Hexaxanopsis monouncata n.sp.

( Figure 5 )

Material examined — Holotype male, Slow flowing stream, Nam Nao NP, Thailand, 15°44.422N 101°34.774E, alt. 1190 m a.s.l., 15-xi-2007. Paratype: one male, same data as holotype .

Diagnosis — Only first coxae drawn into hooks; a pair of dorsal glandularia directly lateral to excretory pore; P2 ventrally with a large nose-shaped extension.

Description — Male: Idiosoma dorsally 397 (397) long and 328 (324) wide, ventrally 381 (373) long. Dorsal shield 300 (300) wide, fused anteriorly with ventral shield, and with A2 and six pairs of glandularia, the most posterior pair directly lateral of excretory pore; postocularia close to dgl-2. Coxal suture lines almost completely obliterated. Only first coxae drawn into hooks. Between fourth leg sockets and genital field two pairs of glandularia, but one pair very close to genital field and only visible in posteromedial view. Genital field terminal, with three pairs of acetabula; gonopore 28 long. Length of P1-5: 27, 40, 26, 64, 22; P1 relatively long, P2 ventrally with a large nose-shaped extension. Length of I-leg-4-6: 46, 60, 60 (till tip of segment).Length of IV-leg-4-6: 78, 83, 58 (till tip of segment). IV-leg modified, IV-leg-5 elongated and slightly curved and striated, IV-leg-6 stocky. Numbers of swimming setae: II-leg-5 three, II-leg-4 two, III-leg-5 four, IV-leg-4 two, IV-leg-5 three. Female: Unknown.

Etymology — Named for the presence of only one pair of coxal hooks.

Remarks — The two other Plesiobrachypoda species have both the first and second coxae drawn into hooks. Axonopsis periyar Pesic and Ranga Reddy, 2009 from India has very stocky IV-leg-5 and-6 (Pesic and Ranga Reddy 2009).

Figures

FIGURE 5: Hexaxonopsis monouncata n. sp., holotype male: A – dorsum; B – venter; C – palp; D – IV-leg-4-6. Scale bars = 50 µm.