Atractides rivalis

Gerecke, Reinhard, 2003, Water mites of the genus Atractides Koch, 1837 (Acari: Parasitengona: Hygrobatidae) in the western Palaearctic region: a revision, Zoological Journal of the Linnean Society 138, pp. 141-378 : 287-288

ATRACTIDES RIVALIS LUNDBLAD, 1956 ( FIG. 66A–F )

Type series: Holotype ♀, SMNH 4989 Typ.; Atractides rivalis ♀ Ldbl. Österrike. Lunz, Källa. 28.5.1955. Leg. O. Lundblad. State of conservation: perfect; gnathosoma in situ, both I-L and palps separate, lateral.

Material examined: SMNH ♂ 5011; Atractides rivalis Ldbl . ♂. Österrike. Lunz. Källa. 28.5.1955 Leg. O. Lundblad

Description:

General features dorsal integument: lineated (3/10 Mm); muscle attachments: smooth coxal field: mediocaudal margin Cx-1 equally convex, apodemes of Cx- 2 in an obtuse angle

I-L: setae S-1 and -2 moderately distanced and heteromorphic, I-L-6 curved, from the base to the claw furrow moderately tapering genital field: Ac large, in triangular position excretory pore: smooth; Vgl-1: not fused to Vgl-2

palp: P-2 ventrodistally convex, but without protrusion, ventral margin of P- 3 straight, P-4 with weak sexual dimorphism

Males

SMNH 5011, first description genital field: wider than long, anterior margin indented but with an equally convex border of secondary sclerite, posterior margin indented to about the level of 1/3 Ac-3; genital setae: 36

palp: P-4 thickened, ventral margin 1: 1: 1, slightly elevated near proximoventral hair, sword seta on the level of distoventral hair idiosoma L/W 620/500; glandularia 25

coxal field L 324; Cx-3 W 365; Cx-1 + 2 mL 117, IL 229, W 365

I-L-5 dL 172, vL 114, dL/vL 1.51, HA-HC 45, 52, 65, dL/HB 3.31

S-1 L 90, L/ W 11.3, S-2 L 72, L/ W 7.2, interspace, 22, L S-1/2 1.25

I-L-6 L 128, HA-HC 24, 20, 21, dL/HB 6.4; L I-L-5/6 1.34

genital field L/W 139/180, Ac-1–3 L 63, 66, 59

gnathosoma vL 135; chelicera –

Figures

Figure 66. Atractides rivalis. A, B, holotype ♀ SMNH 4989, C–F, ♂ SMNH 5011. A, ♀ palp, medial view; B, ♀ genital and postgenital field; C, ♂ I-L-5 and -6; D, ♂ coxal field, E, ♂ palp; F, ♂ genital field. Scale bars = 100 µm.