Arrenurus albator (O.F. Müller, 1776)

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 : 38-39

Arrenurus albator (O.F. Müller, 1776)

( Fig. 23 )

Hydrachna albator O.F. Müller, 1776

Arrenurus errator Thor, 1897

Arrenurus falciger Viets, 1908

Material examined: 10 larvae deriving from 10 females.

Larvae medium-sized: idiosoma 196–206 µm long.

Dorsum: Dp medium-sized (DpL: 192–208 µm; DpW: 144–172 µm), egg-shaped, ends distinctly narrowing, widest at mid-length. Antero-lateral indents large, almost right-angled, about 1/5 and 1/3 of plate’s length and width, respectively. DpW/Mp1-Mp1 5.0. Lp2, Mh1 smooth. Mp1-Mp1 very short (30–33 µm), shorter than Mp2-Mp2 (36–39 µm); Mp1-Lp2 relatively short (38–42 µm). Venter: CpIIm (30–34 µm) shortest, CpI- IIm somewhat longer (34–37 µm); CpIm longest (62–67 µm). CpI:CpII:CpIII ratio 2:1:1.2. C3, C4 bipectinate; C1, C2 pectinate. C1-CpIm (15–19 µm) about 2/3 of C4-CpIIIm (26–31 µm); C1-C2 intermediate length (42–44 µm). Expp oval, its width and length equal. Exp located clearly below plate’s mid-point, level with E2. Palps: PIII 1 bipectinate; PV5 relatively thick and long; PV3, PV4 bipectinate on distal ends; PV6 relatively long. Chelicerae: First segment cylindrical (72–78 ųm), slightly curved in anterior part. Legs: As long as body; LI< LII = LIII ( Fig. 4 ). ITi8 thin, short; IGe3, IIGe3, IIIGe3 relatively thick; IITi10, IIITi10 located close to mid-point of tibia. Hosts: larvae of Coleoptera ( Cassagne-Méjean 1966) , Nematocera ( Stechmann 1980).

Figures

FIGURE 4. Diagram of proportions of leg (LI<LII=LIII) and body length.

FIGURE 23. Arrenurus albator: A—ventral side, B—dorsal plate, C—excretory pore plate, D—pedipalp (scale bars: A, B—100 µm; C, D—20 µm).