Arrenurus crassicaudatus Kramer 1875

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 : 40

Arrenurus crassicaudatus Kramer 1875

( Fig. 24 )

Arrenurus gilvator Thor, 1897

Material examined: 10 larvae deriving from 10 females.

Larvae medium-sized: idiosoma 210–222 µm long.

Dorsum: Dp medium-sized (DpL: 196–208 µm; DpW: 156–174 µm), egg-shaped, widest in mid-length. Antero-lateral indents large, obtuse-angled, about 1/4 and 1/3 of plate’s length and width, respectively. DpW/ Mp1-Mp1 5.2. Lp2, Mh1 smooth ( Fig. 1 ). Mp1-Mp1 short (30–33 µm), shorter than Mp2-Mp2 (39–44 µm); Mp1-Lp2 intermediate length (37–45 µm). Venter: CpIIm (36–40 µm), CpIIIm (34–39 µm) about equal length; CpIm twice as long (63–67 µm). All setae on Cp bipectinate. C1-CpIm (18–21 µm) about 2/3 of C4- CpIIIm (29–31 µm); C1-C2 intermediate (42–44 µm). Expp oval, of equal width and length. Exp located in plate’s mid-point, about level with E2. Palps: PIII 1 relatively thick and bipectinate; PV3, PV4 pectinate on distal ends; PV6 short, thick. Chelicerae: First segment bottle-shaped (78–83 µm), margins almost flat and parallel, distinctly narrowed anteriorly. Legs: Shorter than body; LI= LII = LIII ( Fig. 5 ). ITi8 thin, short; IGe3, IIGe3, IIIGe3 thick, bipectinate; IITi10, IIITi10 located close to mid-point of tibia. Hosts: Chaoboriddae, Chironomidae , Tanypodidae ( Stechmann 1976 /77, 1978).

Figures

FIGURE 1. Arrenurus maculator: A—ventral side, B—dorsal side, C—excretory pore plate, D—pedipalp, E—chelicera, F—leg I, G—leg II, H—leg III (scale bars: A, B—100 µm; C, D—10 µm; E—50 µm; F, G, H—20 µm).

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

FIGURE 24. Arrenurus crassicaudatus: A—ventral side, B—dorsal plate, C—excretory pore plate, D—pedipalp (scale bars: A, B—100 µm; C, D—20 µm).