Atractides samsoni (Sokolow, 1936)

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 : 230

ATRACTIDES SAMSONI ( SOKOLOW, 1936) ( FIG. 41D–L )

Megapus samsoni Sokolow, 1936

Syn. A. laetus Lundblad, 1962 : syn. nov.

Type series: Holotype male ZISP 1 /831 N 422 Type ♂ Megapus samsoni n.sp., 1935; Peterhof Hauptkanal [?] 9.VI.24. I.Sokolow. Locus typicus: Hauptkanal der Peterhofer Wasserleitung oberhalb des ersten Dammes, in 3–4 km Entfernung von der Eisenbahn, gegenüber dem Dorfe Kostino, 9.VI.1924. State of conservation: idiosoma complete, with Gsk in situ, caudal area pleated and gonopore crushed; gnathosoma and chelicerae in situ, both palps and right I- L separate, lateral; obviously a juvenile with coxae placed close together and missing secondary sclerotization, caudal area of idiosoma short

Material examined: Atractides laetus Lundblad (1962) , Holotype ♀, SMNH; 5325.

Description:

General features dorsal integument: striated; muscle attachments: unsclerotized

I-L: I-L-5 basally slender, slightly thickened near insertion of S-1 and -2; S-1 and -2 homoiomorphic, slender and short, blunt, close to each other; I-L-6 weakly curved, stout, only slightly narrowed in the centre genital: Ac relatively large excretory pore: smooth; Vgl-1: not fused to Vgl-2

palp: weak sexual dimorphism, P-2 with ventrodistal protrusion, P-3 with straight ventral margin, P-4 1: 1: 1, sword seta between ventral hairs, more or nearer to distoventral hair

Males

Holotype (in parentheses measurements published for A.laetus from Biesiadka (1978), or calculated from his figures)

genital field: anterior margin convex, posterior margin truncate, not indented; genital setae: 50, rather long palp: ventrodistal protrusion of P-2 conus-shaped, P-3 with rough surface distally, P-4 with obtuse angled protrusion near proximal hair idiosoma L/W 560/410 (540–620/480–575); glandularia 23

coxal field L 293 (250); Cx-3 W 350 (311); Cx-1 + 2 mL 94 (96), IL 229 (182), W 293 (257)

I-L-5 dL 170 (140), vL 130 (110), dL/vL 1.31 (1.27), HA-HC 36 (30), 47 (38), 55 (45), dL/HB 3.62 (3.68)

S-1 L 78 (68), L/ W 13.0 (10.0), S-2 L 71 (56), L/ W 11.8 (8.5), interspace 14 (7), L S-1/2 1.1 (1.2)

I-L-6 L 145 (121), HA-HC 28 (23), 25 (23), 28 (25), dL/HB 5.80 (5.26); L I-L- 5/6 1.17 (1.16)

genital field L/W 112/130 (90/95), Ac-1–3 L 33-32-38 (27-20-34)

gnathosoma vL 138; chelicera –

Figures

Figure 41. A–C, Atractides gladisetus ♀ (from Husiatinschi, 1937). A, palp, medial view; B, coxal and genital field; C, I-L- 5 and -6. D–L, Atractides samsoni; D, E, H, holotype of A. laetus (syn. to A. samsoni); F, G, I, K, L holotype ♂. D, ♀ palp, medial view; E, ♀ I-L; F, G, ♂ I-L-5 and -6, anterior and posterior view; H, ♀ genital and postgenital field; I, ♂ palp; K, ♂ coxal field; L, ♂, genital field. Scale bars = 100 µm.