Atractides ovalis (Piersig, 1896)

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 : 168-170

ATRACTIDES OVALIS KOENIKE, 1883 ( FIG. 15A–G )

Type series: Missing. First described under the name Megapus spinipes Neuman, 1880 , based on a female specimen from Sweden (not conserved in Neuman collection, SMNH). Neotype (here designated): SMNH 830 ♂ Möens Klint, Kunosö, 19.9.1925 leg. O. Lundblad.

Material examined: NHUB: Megapus ovalis Koen ; Seeland [non deciph.] 24.7.1895, ten specimens on one slide, completely desiccated; seven specimens in Hoyer’s fluid, three specimens transferred to Euparal; Atractides ovalis Koen. ♀ Megapus ; Mecklenburg Moritz-See leg Dr Zacharias Farrants Medium , completely desiccated, transferred to Hoyer’s fluid; 1054 Megapus ovalis (Koen.) ♂ Bremen Kattenesch, Mühlenbach, Koen. leg. 27.7.06; 1055 Megapus ovalis (Koen.) ♀ Seeland, Lyngby, See, Koen. leg. 40.7.1895; 1061 Megapus ovalis (Koen.) ♂ Seeland, Hulsee, Koen. leg. 29.7.1895; 1063 Megapus ovalis (Koen.) Ny., Holstein, Gremsmühlen, Koen. leg., 18.8.1895; 1064 Megapus ovalis (Koen.) ♀, Seeland, Hoggraard Koen. leg. 29.7.1895 . NHMB: Megapus ovalis ♂ ♀; P.S. Grosszschocher [ex coll. Piersig] two slides containing idiosoma/gnathosoma + I-L resp., completely desiccated; Megapus placophorus ♀ Walter Vierwaldst. See , 18.6.13 coll. Wacker; Typus [never published species name, well-conserved specimen] . SMF: 5859, Atractides ovalis (Koen.) ♀ ♂; Bremen Wumme 9.9.1907 Viets coll. 1 ♂, 5 ♀ [♀ not ovalis ], well conserved . SMNH: 830, ♂ Möens Klint, Kunosö, 19.9.1925 leg. O. Lundblad [Neotype]; 831, ♀ Möens Klint , Jydelejet 20.9.1925 leg. O. Lundblad; 6272, ♀ Megapus ovalis Koenike ♀ Bremen Habenhausen Werder , Bracke , 11.6.1892 leg. et det. F. Koenike O. Lundblad, well conserved but undissected .

Description:

General features dorsal integument: striated (8/10); muscle attachments: unsclerotized coxal field: slightly protruding anterior edges of Cx-1–3

I-L: S-1 and -2 close to each other; l-L-6 continuously narrowed distally, with minute claws

II/IV-L: very slender, IV-L-4 with 3, IV-L-5 with 4 specialized ‘swimming’ setae at distal margin, longest seta reaching 4/5 L IV-L-6

excretory pore: smooth; Vgl-1: not fused to Vgl-2

palp: weak sexual dimorphism

Males

SMNH 830, male in SMF 5859

genital field: anterior margin irregularly convex, posterior margin with concave indentation palp: ventral margin of P-2 and P-3 straight, ventral margin P-4 1: 2: 1, sword seta near distoventral hair idiosoma L/W 500–380; glandularia 27

coxal field L 174; Cx-3 W 306; Cx-1 + 2 mL 102, IL 187, W 248

I-L-5 dL 169, vL 140, dL/vL 1.21, HA-HC 39, 50, 53, dL/HB 3.38

S-1 L 85, L/ W 9.4, S-2 L 67, L/ W 6.7, interspace 9; L S-1/2 1.27

I-L-6 L 105, HA-HC 22, 18, 16, dL/HB 5.83; L I-L-5/6 1.61

genital field L/W 93/114, Ac-1–3 L 21, 23, 27

gnathosoma vL 111; chelicera L 184, L/H 4.84, bS/claw 2.68

Figures

Figure 15. Atractides ovalis. A, SMF 5859, B–D, SMNH 830, E–G SMNH 831. A, ♂ coxal field and gnathosoma, ventral partial view; B, ♂ genital field; C, ♂ palp, medial view; D, ♂ I-L-4/5; E, ♀ IV-L-5; F, ♀ palp, lateral view; G, ♀ genital field. Scale bars = 100 µm.