Arrenurus nobilis Neuman, 1880

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 : 44-45

Arrenurus nobilis Neuman, 1880

( Fig. 27 )

Arrenurus Kanei Halbert, 1900

Arrenurus kanei Piersig, 1901

Material examined: 6 larvae deriving from 1 female. Larvae large: idiosoma 258–276 µm long.

Dorsum: Dp egg-shaped (DpL: 244–268 µm; DpW: 200–210 µm), widest at mid-length; posterior margin sharpened. Antero-lateral indents very small, obtuse-angled, about 1/8 and 1/4 of Dp length and width, respectively. DpW/Mp1-Mp1 4.8. Lp2, Mh1 bipectinate ( Fig. 2 ). Mp1-Mp1 (42–43 µm) much shorter than Mp2-Mp2 (56–57 µm). Venter: CpIIm intermediate length (34–37 µm), CpIIIm (56–60 µm) long, CpIm long (80–84 µm); CpI:CpII:CpIII ratio 2.4:1:1.7. All Cp setae and V 3 bipectinate. C1-CpIm (30–32 µm) almost equal to C4-CpIIIm (34–37 µm); C1-C2 intermediate length (44–50 µm). Expp triangular in outline, margins strongly curved, much wider than long. Exp located below plate’s mid-point and below E2. Palps: PIII 1 bipectinate. Chelicerae: First segment elongated (94–102 µm), margins slightly curved, parallel. Legs: Very long, as long as body; LI< LII = LIII ( Fig. 4 ). IFe3, IIFe3, IIIFe3 pectinate; IGe4, IIGe4, IIIGe4, IITi8 relatively long; IIITi7, IIITi8 relatively long and bipectinate. ITi8 very long, pectinate; IITi10 smooth; IIITi10 pectinate. IITi10, IIITi10 located about 1/3 of distance to distal end of tibia.

Figures

FIGURE 2. Diagram of pedipalp chaetotaxy and solenidiotaxy of larva of Arrenurus genus: —solenidium, — smooth seta, —pectinate seta, —bipectinate seta, —thin seta, —medium-thickness seta, — thick seta,

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

FIGURE 27. Arrenurus nobilis: A—ventral side, B – dorsal plate, C – excretory pore plate, D—leg I, E—leg II, F—leg III (scale bars: A, B—100 µm; C—20 µm; D, E, F—50 µm).