Atractides

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 : 275

ATRACTIDES UMBONIPALPIS SZALAY, 1954

Species dubia

Type series: Missing. Locus typicus: Hoverla (Máramaroscher Schneegebirge, Nordöstliche Karpathen) aus einem Bache, 1600 m ü. d. M., 16.08.1939 1 ♂, 1 ♀ von Dr. E. Dudich gesammelt.

Discussion: After the first description of one male and one female ( Szalay, 1954), A. umbonipalpis was not recorded again, and the taxonomic state of A. umbonipalpis was never discussed. Szalay compared it with A. subasper , A. glandulosus , A. coriaceus , and A. panniculatus , four species similar in having Vgl-3 fused to the posterior margin of Cx-4. All these species differ strongly from several points of view. Instead, A. umbonipalpis agrees well with A. vaginalis , a species in which the extension of the coxal sclerotization varies according to age in males. With regard to dimensions and proportions, only minute differences can be found between A. umbonipalpis and A. vaginalis , mainly regarding the shape of the male palp (P-2 proximoventrally concave, P-4 laterally inflated in the area of the dorsal hair cover) and the rather strongly protruding distoventral edge of I-L- 5 in both sexes. Due to the observed differences and the lack of type material, a definitive decision is impossible. A. umbonipalpis is a species dubia, probably a synonym of A. vaginalis .

ATRACTIDES DIGITATUS LUNDBLAD, 1954

( FIGS 60A–D , 61A–F )

Type series: SMNH Holotype ♂ 4352. Typ. Atractides digitatus Ldbl. ♂ Spanien. Fjällbäck 3 mil nordost Granada, 12.6.1935 – Leg. O. Lundblad. State of conservation: gnathosoma in situ, both palps, both I-L and left IV-L separate, laterally, left III-L missing . Paratype ♀ 4353. Allotyp. Atractides digitatus Ldbl. ♀ [like holotype]. State of conservation: like holotype, but gnathosoma separate, laterally, and legs complete.

Material examined: Spain: Aragon, Beceite, Rio Mataranya upstream Vall del Prat , 600 m, 18.04.1998 Gerecke, 4 ♂, 4 ♀

Description:

General features dorsal integument: striated, leathery; muscle attachments: sexual dimorphism in the dorsal area, but V-1–3 unsclerotized in both sexes coxal field: Cx-1 + 2 plate caudally narrowed and caudal margin of Cx-1

strongly curved, apodemes of Cx-2 directed laterally; Cx-4 with sexual dimorphism I-L: I-L-5/6 very stout, wide setal interspace, both apically rounded but extremely heteromorphic, S-1 thick, long and slightly curved, S-2 slender and short; I-L-6 curved, equal in height from the base to the claw furrow genital field: Ac large, in triangular position excretory pore: smooth; Vgl-1: not fused to Vgl-2 gnathosoma: with an elongated rostrum, pointed in ventral view chelicera: with a relatively long, fine and rather straight claw palp: very stout, P-3 with slightly concave ventral margin, sword seta P-4

between ventral hairs or approached to proximoventral hair, sexual dimorphism of P-2 and P-4

Males Holotype, in parentheses specimens from Aragon Muscle attachments: unpaired anterior dorsal shield anteriorly pointed, posteriorly enlarged and with straight caudal margin, including prefr, postoc,

Dgl-3 and D-1, unpaired posterior dorsal shield with slightly convex or indented anterior, and undulating lateral/caudal margins including Dgl-4–

6 and D-3–5 Coxae: Cx-4 caudally with extended secondary sclerotization including Vgl-3 Genital field: anterior margin with irregularly convex secondary sclerotization, posterior margin medially indented; genital setae: [50] palp: P-2 with a strong and narrow, finger-like distoventral protrusion, P-4

ventrally protruding in a blunt tip at the insertion level of the distoventral hair, ventral hairs long, close to each other, dividing the ventral margin

3: 1: 2 idiosoma L/W 490/370; glandularia 28 coxal field L 302; Cx-3W 310; Cx-1+2 mL 145, IL 210, W 243 I-L-5 dL 121, vL 85, dL/vL 1.42, HA-HC 49, 56, 61, dL/HB 2.16 S-1 L 65, L/ W 7.22, S-2 L 29, L/ W 7.25, interspace 16, L S-1/2 2.24 I-L-6 L 104, HA-HC 29, 28, 30, dL/HB 3.71; L I-L-5/6 1.16 genital field L/W – (124)/144(148), (Ac-1–3 L 38, 50, 45) gnathosoma vL 121; (chelicera L 281, L/H 6.24, bS/claw 1.60)

Figures

Figure 60. Atractides digitatus ♂. A, Gerecke E 131a, B–D, holotype SMNH 4352. A, dorsum; B, coxal, genital and postgenital field; C, I-L-5 and -6; D, palp, medial view. Scale bars = 100 µm.

Figure 61. Atractides digitatus ♀. A, Gerecke E 131a, B–F, paratype SMNH 4353. A, dorsal idiosoma, partial view of anterolateral sector; B, gnathosoma with chelicera in situ, lateral view; C, palp, medial view; D, I-L-5 and -6; E, coxal field; F, genital field. Scale bars = 100 µm.