Arrenurus (Megaluracarus) geniculatus Koenike, 1898

Smit, Harry, 2021, Water mites from West Africa (Acari: Hydrachnidia), Acarologia 61 (3), pp. 700-746 : 740-741

Arrenurus (Megaluracarus) geniculatus Koenike, 1898

( Figure 25 A-B)

New record. Ghana. 3/1/0, Inlet Volta River at Kpong, 6°09.183′ N 0°03.709′ E, 25 m

a.s.l., 27 Feb. 2013.

Description. Female: Idiosoma colour greenish. Anterior idiosoma margin slightly concave, posterolateral corners of idiosoma indistinct. Idiosoma dorsally 778 long and 660

wide, ventrally 782 long. Dorsal shield incomplete, 429 wide. Anterior coxae extending beyond anterior idiosoma margin. Medial margin of Cx-IV slightly longer than medial margin of Cx-III. Medial distance of Cx-IV shorter than width of gonopore field. Genital field 421

wide, genital plates relatively broad, extending more or less halfway lateral idiosoma margin

( Figure 25A ). Length of P1–5: 20, 60, 34, 68, 33. P2 medially with three short setae; P4

stocky, anteroventrally rounded, anterior margin with a small extension ( Figure 25B ). Length of I-leg-4–6: 128, 118, 124. Length of IV-leg-4–6: 122, 130, 148. Legs with numerous swimming setae.

Remarks. The female of this species has not been described before. The small extension of the anterior margin of P4 is also present in the males of this study.

Distribution. Madagascar, Ghana (this study).

Figures

Figure 25 Arrenurus (Megaluracarus) geniculatus Koenike, female. A – venter; B – palp. Scale bars: A = 200 µm, B = 50 µm.