Atractides distans, (K. VIETS, 1914)

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 : 186

ATRACTIDES DISTANS (K. VIETS, 1914) ( FIG. 24A–G )

Megapus distans K. Viets, 1914

Type series: Holotype ♀ SMF K. Viets 1545 Megapus distans Viets ♀ Type Prov. Brandenburg, Neuenburger Fl. b. Hoppegarten VIII.1899 Protz leg., state good, Cx-1 + 2 medially damaged . Paratype ♂, SMF K. Viets 1539; labelled like holotype. State of conservation: good, but Cx-1 + 2 broken medially, Gsk missing. The original description does not contain type designations, but in a later paper K. Viets (1959) declared that he considered the male specimen to be a paratype .

Material examined. GERMANY: SMF KOViets 1347, Kossau-Bach nördl. Rantzau, Holstein (108/49) 29.7.1949, 1 ♂, 1 ♀ ; SMF KOViets 951, Erlangen, Lachgraben an der Nürnberger Chaussee , H.-J. Stammer leg. 11.10.1949 1 ♂, 1 ♀ ; Germany , Baden-Württemberg, surroundings of Freiburg / Br. 1979 Meyer, 1 ♀ ; Brandenburg, Lausitz, Wudritz near Willmersdorf-Stöbritz, 23.06.1996, Pusch, 1 ♀ ; The Netherlands , coll. Besseling: Rosep, Haaren 729 04.47, 11 ♂, 21 ♀ ; ditto 725 09.46 6 ♂, 4 ♂ Gr.Wetering, Naathozarn, 726 10.46, 1 ♂, 1 ♀; Neersop , Westerhaven, 822 04.49 1 ♂ .

Refused determinations: Germany, SMF KOViets 1796 and, 1809, Mölle, linker Zufluss von Hals z. westl. Strasse; südl. Möllenbeck bei Rinteln (16/53) 22.7.1953, 2 ♂, 1 ♀ (= A. allgaier nov. sp.) ; the Netherlands, coll. Besseling, Geest Teograat [..] 07.49 (= A. nodipalpis ) .

Description:

General features dorsal integument: striated (8/10); muscle attachments: unsclerotized

I-L: I-L-5 with S-1 and -2 wide interspace, S-1 near to the ventral seta, long and slender, slightly curved and with truncate, enlarged tip, S-2 pointed, basally enlarged; I-L-6 very long and slender excretory pore: smooth; Vgl-1: not fused (but occasionally closely nearer) to Vgl-2

palp: no sexual dimorphism, ventral margin P-2 straight, with slightly curved distal edge, P-3 and P-4 straight, P-4 with slight elevation near insertion of proximoventral hair, 1: 1: 1, sword seta on the level of distoventral hair

Males

Paratype, in parentheses variability of I-L in specimens from The Netherlands, Besseling 725, 726, 729, 822, n = 12

genital field: anterior margin truncated or slightly convex, caudal margin weakly indented idiosoma L/W 560/450; glandularia 28

coxal field L 306; Cx-3 W 416; Cx-1 + 2 mL 100, IL 200, W 315

I-L-5 dL 183 (175–210), vL 108 (105–130), dL/vL 1.69 (1.40–1.76), HA-HC 47, 52 (50–63), 82, dL/HB 3.52 (3.20–3.70)

S-1 L 134 (123–150), L/ W 16.8, S-2 L 89 (80–100), L/ W 8.9, interspace 39 (30– 48), L S-1/2 1.51 (1.40–1.58)

I-L-6 L 170 (165–208), HA-HC 21, 16 (15–18), 16, dL/HB 10.63 (10.0–12.2); L I-L-5/6 1.08 (1.00–1.06)

genital field L/W 94/110, Ac-1–3 L 20, 25, 32

gnathosoma vL –; chelicera L 168, L/H 5.25, bS/claw 2.57

Figures

Figure 24. Atractides distans. A–C, lectotype ♂, D–F, paralectotype ♀ G, ♂ Germany, Lausitz. A, ♂ palp, medial view; B, ♂ I-L-5 and -6; C, ♂ genital field; D, ♀ palp, medial view; E, ♀ genital field; F, ♀ I-L-5 and -6; G, ♂ coxal field. Scale bars = 100 µm.