Arrenurus neumani Piersig, 1895

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 : 26

Arrenurus neumani Piersig, 1895

Arrenurus emarginator Neuman, 1870

Material examined: 10 larvae deriving from 10 females.

Larvae very similar to those of A. affinis , virtually non-distinguishable.

Idiosoma 236–244 µm long.

Dorsum: Dp (DpL: 230–240 µm; DpW: 170–174 µm) shield-shaped, widest at mid-length, distinctly narrowing posteriorly. Anterior margin almost straight; posterior margin sharpened. Antero-lateral indents deep, obtuse-angled, extend to 1/4 of plate’s length and width. DpW/Mp1-Mp1 2.7. Mp1-Mp1 (62–66 µm) longer than Mp2-Mp2 (56–60 µm). Lp2, Mh1 pectinate. Venter: CpI:CpII:CpIII ratio 2.2:1:1.2. C1, C2, C4 bipectinate, C3 pectinate. C1-CpIm (18–21 µm) about 2/3 of C4-CpIIIm (33–36 µm). C1-C2 (45–48 µm) intermediate. Expp pentagonal, clearly wider than long. Exp in central location of plate, distinctly above E2. Palps: PIII 1 bipectinate. Chelicerae: First segment elongated cylinder-shaped, slightly tapered anteriorly, margins slightly bent. Legs: As long as body; LLI< LII < LIII ( Fig. 3 ). Leg setation as in A. affinis . Hosts: Lestes sponsa (Hansem.) , Pyrrhosoma nymphula , Enallagma cyathigerum ( Davids 1997) .

Figures

FIGURE 3. Diagram of proportions of leg (LI<LII<LIII) and body length.