Arrenurus pustulator (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 : 35

Arrenurus pustulator (O. F. Müller, 1776)

( Fig. 20 )

Hydrachna pustulator O. F. Müller, 1776

Trombidium pustulator Fabricius, 1793

Atax pustulator Fabricius, 1805

Material examined: 10 larvae deriving from 1 female.

Larvae medium-sized: idiosoma 183–206 µm long.

Dorsum: Dp medium-sized (DpL: 176–198 µm; DpW: 150–161 µm), oval, anterior and posterior margins rounded. Antero-lateral indents relatively large, about 1/4 of plate’s width and length, obtuse-angled. DpW/ Mp1-Mp1 3.1. Lp2, Mh1 smooth and thin. Mp1-Mp1 intermediate length (47–49 µm), slightly longer than Mp2-Mp2 (39–43 µm); Mp1-Lp2 relatively short (36–41 µm). Venter: CpIIIm (24–28 µm) slightly longer than CpIIm (23–25 µm), CpIm (62–66 µm) almost three times as long. CpI:CpII:CpIII ratio 2.7:1:1.1. Setae on Cp smooth. C1, C4 located close to median margins of Cp. C1-CpIm (15–16 µm) longer than 2/3 of C4- CpIIIm (22–24 µm); C1-C2 intermediate (42–46 µm). Expp pentagonal, distinctly wider than long. Exp located below plate’s mid-point and below E2. Palps: PV6 relatively thick; PV3, PV4, PV5 thin. Chelicerae: Relatively large, thick (82–85 µm) first segment. Legs: Shorter then body; LI< LII = LIII ( Fig. 4 ). IIITa8 present. ITr1, IITr1, IIITr1, IFe7, IIFe7, IIIFe7 pectinate. IITi10, IIITi10 pectinate, relatively long, situated close to distal ends of tibia; IIITa13 pectinate; IIITa11, IIITa12 pectinate, large. Hosts: Coenagrion hastulatum , Cordulia aenea (L.) ( Davids 1997).

Figures

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

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