Arrenurus latus Barrois & Moniez, 1887

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 : 42-43

Arrenurus latus Barrois & Moniez, 1887

( Fig. 26 )

Arrenurus coardatus Piersig, 1896

Arrenurus ligulator Koenike, 1905

Material examined: 6 larvae deriving from 1 female. Larvae relatively large: idiosoma 204–224 µm long.

Dorsum: Dp medium-sized (DpL: 195–209 µm; DpW: 153–159 µm), egg-shaped, widest in mid-point. Antero-lateral indents deep, somewhat obtuse-shaped, about 1/5 and about 1/3 of Dp length and width, respectively. DpW/Mp1-Mp1 4.6. Lp2, Mh1 smooth. Mp1-Mp1 long (67–71 µm), shorter than Mp2-Mp2 (39–42 µm); Mp1-Lp2 relatively short (38–40 µm). Venter: CpIm (66–68 µm) twice as long as other Cp; CpIIm (35–37 µm) and CpIIIm (35–37 µm) identical in size; CpIm:CpIIm:CpIIIm ratio 2:1:1. All setae on Cp bipectinate. C4-CpIIIm (29–31 µm) 1.5 times C1-CpIm (18–19 µm); C1-C2 intermediate length (42–47 µm). Expp oval, as wide as long. Exp located sub-centrally on plate, about level with E2. Palps: PIII 1 bipectinate; PV3, PV4 pectinate; PV1 (solenidium) relatively large. Chelicerae: First segment shaped like a somewhat curved cylinder (63–65 µm), narrowed anteriorly. Legs: About as long as body; LI< LII = LIII ( Fig. 4 ). ITi8 thin, long; IGe3, IIGe3 relatively thick and bipectinate; IITi10, IIITi10 located near mid-point of tibia. Hosts: Nematocera ( Stechmann 1980).

Figures

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

FIGURE 26. Arrenurus latus: A—ventral side, B—dorsal plate, C—excretory pore plate, D—pedipalp (scale bars: A, B—100 µm; C, D—20 µm).