Atractides abditus, (WALTER), 1955

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 : 280

ATRACTIDES ABDITUS (WALTER) BADER, 1955

Species dubia

Type series: Missing. Locus typicus: Höhlen von S. Canziano (Rinaldini- Dom); following Stammer (1932): collecting site R3, 1928/1929

Discussion: ‘ Atractides abditus (Walter) ’ was first published as a nomen nudum in a faunistic survey of the Timavo catchment in eastern Italy / Slovenia ( Stammer, 1932). Bader found the female on which this species should be based and gave a ‘posthumous’ description. Since then, it has not been discussed and the type specimen is now lost. Characters of eventual taxonomic importance provided in that description are: integument striated, idiosoma L/W 800/585, glandularia diameter max. 30 Mm; caudal apodemes Cx-2 slightly protruding, suture Cx-3/4 strongly curved and in its medial part directed caudally; I-L-5/6 L 205/166 (ratio 1.23) median setal interspace, S-2 larger than S-1, I-L-6 curved, only slightly thinning in the centre; gonopore L 150, genital plates L 100 Mm, L Ac-1> Ac- 2/3, excretory pore smooth (?) position of Vgl-1 unclear; palp L 360 Mm, ventral margins of P-2 not strongly convex, of P-3 slightly concave, of P-4 straight; P-4 ventral sectors 1: 1: 1, sword seta between ventral hair insertions.

In view of the Ac arranged in a weakly curved line, Bader regarded it as related to the little known A. arcuatus and restricted the discussion to some measurement differences between these two taxa. Due to the scanty information, and in view of the absence of type material, no interpretation of A. abditus is possible and it remains a species dubia.

ATRACTIDES PROTENDENS K. O. VIETS, 1955

( FIG. 63A–F )

Type series: Holotype ♂, SMF 899 Atractides protendens K. O. Viets ♂ Holo- Typus; Hetzles; Erlangen. Schliersbach; Forstquelle. H.-J. Stammer leg. 12.9.1949. 899 ; Allotype ♀ SMF 626 , as holotype, but. 24.4.1949 . Paratype ♂, SMF 910 , as holotype, but Schlierbach, kleine Nebenquelle.... Slides in perfect state of conservation, with both palps and I-L separate, laterally; in holotype ♂ gnathosoma in situ, in paratype ♂ separate; allotype ♀ slide with two specimens dissected in different ways.

Description:

General features dorsal integument: lineated (with relatively short lines, 2–3/10 Mm); muscle attachments: smooth coxal field: mediocaudal margin Cx-1 convex, weakly protruding, apodemes of Cx-2 short

I-L: I-L-5/6 little modified, S-1 and -2 close to each other, rather short and similar in shape, I-L-6 stout, weakly curved, maximum H at base of claw furrow excretory pore: smooth; Vgl-1: not fused to Vgl-2

palp: weak sexual dimorphism, ventral margins P-2/3 straight, without extensions, sword seta P-4 strong, between ventral hair insertions, but approached to distoventral hair

Males

Holotype SMF 899

genital field: anteriorly convex, with a narrow border of irregular secondary sclerotization, posteriorly indented; genital setae: 60

palp: ventral margin of P-2 forming a right distal angle, not protruding, P-4 thickened, sword seta slightly curved, ventral margin 1: 2: 2

idiosoma L/W 515/400; glandularia 24

coxal field L 270; Cx-3 W 315; Cx-1 + 2 mL 108, IL 189, W 243

I-L-5 dL 130, vL 96, dL/vL 1.35, HA-HC 25, 34, 45, dL/HB 3.82

S-1 L 53, L/ W 8.8, S-2 L 54, L/ W 7.7, interspace, 8, L S-1/2 0.98

I-L-6 L 112, HA-HC 24, 23, 30, dL/HB 4.87; L I-L-5/6 1.16

genital field L/W 117/117, Ac-1–3 L 35, 38, 32

gnathosoma vL 108; chelicera –

Figures

Figure 63. Atractides protendens. A–D, holotype ♂ SMF 899; E, F, paratype ♀ SMF 626. A, ♂ I-L-5 and -6; B, ♂ palp, medial view; C, ♂ coxal field; D, ♂ genital and postgenital field, E, ♀ genital field; F, ♀ palp, medial view. Scale bar = 100 µm.