Arrenurus globator (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 : 45

Arrenurus globator (O. F. Müller, 1776)

( Fig. 29 )

Hydrachna globator O. F. Müller, 1776

Material examined: 10 larvae deriving from 10 females.

Larvae medium-sized: idiosoma 206–228 µm long.

Dorsum: Dp egg-shaped (DpL: 196–220 µm; DpW: 150–180 µm); anterior margin almost straight; posterior margin rounded. Antero-lateral indents very small, 1/5 and 1/7 of plate’s width and length, respectively. DpW/Mp1-Mp1 3.5. Lp2, Mh1 smooth. Mp1-Mp1 (46–50 ųm) about equal length to Mp2-Mp2 (49–50 µm). Venter: CpI:CpII:CpIII ratio 2:1:1.1. All setae on Cp smooth. C1-CpIm (14–18 µm) about 2/3 of C4-CpIIIm (22–25 µm). C1-C2 intermediate length (42–44 µm). Expp rhomboid, clearly wider than long. Exp located somewhat below plate’s mid-point, about level with E2. Palps: PIII 1 bipectinate. Chelicerae: Basal segment bent cylinder-shaped (66–70 µm), margins parallel. Legs: Shorter than body; LI= LII = LIII ( Fig. 5 ). IFe4, IGe2, ITi7, IIFe4, IIGe2, IITi7, IITi8, IIIFe4, IIIGe2, IIITi7, IIITi8 bipectinate; ITr1, IITr1, IIITr1, IIITa13 pectinate; IITi10 IIITi10 located near distal ends of tibia. Hosts: larvae of Dytiscidae ( Böttger & Martin 2003) , Dixidae , Culicidae ( Stechmann 1976 /77, 1978).

Figures

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

FIGURE 29. Arrenurus globator: A—ventral side, B—dorsal plate, C—excretory pore plate (scale bars: A, B—100 µm; C—20 µm).