Atractides longipes, SCHWOERBEL, 1961

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 : 300

ATRACTIDES LONGIPES SCHWOERBEL, 1961 , NEC HALBERT, 1944 = ATRACTIDES PSAMMOPHILUS NOM.

NOV. SCHWOERBEL, 1965

nom. nud. Schwoerbel (1961a) descr. Schwoerbel (1961b) [preocc.]

Syn. to A. oblongus ( Walter, 1944) : syn. nov.

Type series: Lectotype ♂, here designated, CSM Germany, Black Forest Krummenbach , hyp. Grundw., 1960; Atractides longipes ♂ TYPUS PHOT. State of conservation: idiosoma intact, but only right II-L and left IV-L in situ; all other legs dissected and mounted together with mouthparts under separate cover, crushed and desiccated . Paralectotype: female from the same collecting site (mentioned in the original description) lost.

Discussion: Schwoerbel compared A. psammophilus in his initial description with A. firmus , a taxonomically quite distant species here synonymized with A. loricatus , because he interpreted the dorsal muscle attachments as sclerotized platelets. In reality, at least in the lectotype (Schwoerbel figured the lost female paralectotype) they form only granulated areas in the dorsal membrane. A. psammophilus differs furthermore from A. loricatus in having smaller glandular platelets, relatively larger acetabula and a more slender palp. Schwoerbel’s figure 2a is possibly based on a different male insofar as the anterior coxae, and to a minor extent also the genital field, are shorter and wider. The Cx-1 of the lectotype are rather slender and longish (mL Cx-1 108 Mm) with a more strongly curved mediocaudal margin, and the genital field is only slightly enlarged (L/W 83/94 Mm) with the mediocaudal extension of secondary sclerite slightly protruding.

The lectotype of A. psammophilus is obviously a representative of the A. spinipes – A. oblongus group, characterized by small dimensions, a finely striated integument, long coxal field, slightly modified S-1 and -2 on I-L-5, Vgl-1 + 2 fused, and a smooth excretory pore. The latter character was correctly identified by Schwoerbel but his figures suggest the presence of an excretory pore sclerite. Indeed, the excretory pore margin has sclerotized lips, but no proper ring (with a ventrally directed surface) is formed. In all measurements, as well as the shape and setation of palp and I-L (with S-1 and -2 more similar in length than depicted in Schwoerbel’s fig. 2e) the specimen fits the description of A. oblongus . Regarding the name-giving length of posterior leg segments 4–6, no noteworthy difference is found between males of A. oblongus (L IV- L-4/5/6148–155/170–178/132–144) and the holotype of A. psammophilus (L IV-L-4/5/6163/182/144). The unusual shape of the two terminal segments in the latter (with IV-L-5 slightly convex, and IV-L-6 slightly concave) is most probably due to individual misshaping. At the locus typicus, A. longipes was collected together with specimens of A. oblongus (sub nom. A. szalayi ) and should be considered its junior synonym.

ATRACTIDES TRAPEZIFORMIS SCHWOERBEL, 1961

( FIG. 72A–G )

nom. nov. pro Atractides ‘ orghidani ’ Schwoerbel, 1961a nom. nud., nec Motaş & Tanasachi, 1961, descr. Schwoerbel, 1961d.

Type series: Lectotype ♂, here designated, Germany, Black Forest CSM Atractides trapeziformis ♂ TYPE PHOT.; Krummenbach hyp. Grundw., 1960. State of conservation: idiosoma with only left III-L in situ and intact, the other legs ruptured, mostly missing, one I-L separate, together with gnathosoma, palps and detached chelicerae lateral under separate cover, crushed . Paralectotypes: CSM ♂ ATRACTIDES trapeziformis ♂ TYPUS; Krummenbach So.1960. State of conservation: right II-L and left II-IV-L in situ, gnathosoma, both palps, I-L, right III/IV-L under separate cover, laterally; ♀ ATRACTIDES trapeziformis ♀; Krummenbach So.1960. State of conservation: one I-L- missing, the other separate, together with gnathosoma and both palps laterally under separate cover.

Material examined: CSM, Germany, Black Forest , Seebach, hyp. 1400 m, 26.5.61, 1 ♂

Description:

General features dorsal integument: striated; muscle attachments: smooth coxal field: slender, Cx-1 with convexly protruding mediocaudal margin, apodemes of Cx-2 directed laterally

I-L: I-L-5 distally considerably thickened, S-1/2 homoiomorph, slender and blunt, narrow setal interspace, I-L-6 weakly curved excretory pore: smooth; Vgl-1: fused with Vgl-2

palp: weak sexual dimorphism, ventral margin of P-2 and P-3 straight, distally not protruding, P-4 1: 1: 1, sword seta between ventral hairs, approached to proximoventral hair

Males

Lectotype, in parentheses original description genital field: trapeziform, with nearly straight, converging lateral margins on the level of Ac-2/3, anterior margin equally convex or nearly straight, posterior margin weakly indented; genital setae: 46

palp: P-4 maximum H near the proximal hair insertion projecting in an obtuse angle, distally weakly concave idiosoma L/W 500/370; glandularia 45

coxal field L 250; Cx-3 W 280; Cx-1 + 2 mL 94, IL 180, W 210

I-L 5 dL 120, vL 95, dL/vL 1.26, HA-HC –, dl/HB –

Figures

Figure 72. Atractides trapeziformis. A–C, paratype ♀ D, E, from Schwoerbel (1961d); F, G, paratype ♂. A, ♀ I-L-5 and -6; B, ♀ palp, lateral view; C, ♀ genital field; D, ♂ palp, lateral view; E, ♀ palp, medial view; F, ♂ partial dorsal view; G, ♂ partial ventral view. Scale bars = 100 µm.