Arrenurus fimbriatus Koenike, 1885

Zawal, Andrzej, 2008, Morphological characteristics of water mite larvae of the genus Arrenurus Dugès, 1834, with notes on the phylogeny of the genus and an identification key, Zootaxa 1765 (1), pp. 1-75 : 41

Arrenurus fimbriatus Koenike, 1885

( Fig. 25 )

Arrenurus sica Barrois & Miniez, 1887

Material examined: 10 larvae deriving from 3 females.

Larvae relatively small: idiosoma 180–194 µm long.

Dorsum: Dp small (DpL: 174–188 µm; DpW: 149–152 µm), oval, widest in mid-length. Antero-lateral indents relatively small, slightly obtuse-angled, about 1/6 and 1/4 of plate’s length and width, respectively. DpW/Mp1-Mp1 4.4. Lp2, Mh1 smooth. Mp1-Mp1 short (31–36 µm), shorter than Mp2-Mp2 (38–43 µm); Mp1-Lp2 very short (28–34 µm). Venter: Median margins of CpI, CpII, CpIII measure 59–66, 23–29, 37– 42 µm, respectively; their ratio 2.4:1:1.5. C2, C3, C4 pectinate; C1 smooth. C1, C4 located relatively close to median margins of Cp. C1-CpIm (14–18 µm) more than 2/3 of C4-CpIIIm (21–24 µm); C1-C2 intermediate length (42–44 µm). Expp oval, anterior margin with process, somewhat wider than long. Exp located slightly below plate’s mid-point, just below E2. Palps: PIII 1 bipectinate; PV6 long. Chelicerae: First segment cylindrical (74–76 ųm), margins almost flat, somewhat converging anteriorly. Legs: Shorter than body; LI= LII = LIII ( Fig. 5 ). Itr1, IItr1, IIITr1, IIITa10 pectinate; ITi7, ITi8 thin; IITi10, IIITi10 located near midpoint of tibia. Hosts: Nematocera ( Münchberg 1938).

Figures

FIGURE 5. Diagram of proportions of leg (LI=LII=LIII) and body length.

FIGURE 25. Arrenurus fimbriatus: A – ventral side, B – dorsal plate, C – excretory pore plate (scale bars: A, B—100 µm; C—20 µm).