Atractides phreaticus (Motas & Tanasachi, 1948)

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 : 262

ATRACTIDES PHREATICUS ( MOTAŞ & TANASACHI,

1948) ( FIG. 54A–G )

Megapus phreaticus Mota ş & Tanasachi, 1948

Syn. A. hyporheicus Schwoerbel, 1961 : syn. nov.

Type series: Missing. Loci typici: Carpathes Méridionales : Vallée du Rîul Mare ( La grande Rivière ) affluent gauche de l’Olt ( Dép. de Fǎgǎras ) près du village Porumbacu de Sus le 13/VIII/1948 2 ♀, Vallée du Sebeş, affluent gauche de l’Olt, le 15/VIII/1948 1 ♀, Vallée de la Bogata, affluent gauche de l’Olt (Dép. de Târnava-Mare) le 10/VIII/1948 1 ny .

Material examined: NHMB: Lützel, hyp. Coll. Schiess ♂; preparation in good general state, but details of appendages not clearly visible due to precipitations; one palp missing . CSM: ‘ Wagensteig’ and ‘ Wagensteig, hyp.GW’, two ♀, in both slides mouthparts and legs crushed due to dessication of mounting fluid; Atractides hyporheicus TYPE ♂, Krummenbach hyp. Grundw., 1960 (not the holotype of that taxon) one III-L and one IV-L missing, both I-L and mouthparts crushed due to dessication of mounting fluid; Atractides hyporheicus ♂ Steina, Okt. 61 .

Description:

General features dorsal integument: smooth, an extremely fine striation locally visible in tangential view, in older specimens porous; muscle attachments: sclerotized, postoc fused with D-1, but Dgl-3 separate, sexual dimorphism in the posterior part of the dorsum coxal field: Cx-1 with a long median suture, muscle attachments of Cx-2 strongly protruding and curved, their bases medially in touch, or leaving only a very narrow segment of posterior margin Cx-1; sutures Cx-3/4 curved and medially directed to the posterior margin of Cx-4, this margin rather straight

I-L: I-L-5 short and thick, S-1 and -2 weakly distanced from each other, long and with parallel margins, distally slightly enlarged and truncate, I-L-6 strong and thick, weakly curved, with maximum H at the base of the claw furrow excretory pore: sclerotized, sclerite ring extended, with maximum width on the level of anterior margin of excretory pore; Vgl-1: fused with Vgl-2

palp: P-2 with slightly convex ventral margin, sexual dimorphism in shape of P-4, ventral margin 1: 1: 1, sword seta P-4 halfway between ventral hairs

Males

Specimen from NHMB [measurements], specimens from CSM

genital field: oval or roundish, but due to arrangement of gonopore and acetabula appearing oval, with slightly convex anterior, and concave posterior margins, gonopore restricted to the anterior part, with posterior margin on the level of Ac-2; genital setae: 46, medially flanking the anterior 2/3 of gonopore palp: P-4 thickened, with dense dorsal hair cover, in dorsal view strongly enlarged idiosoma L/W 530/360; glandularia 35

coxal field L 256; Cx-3 W 275; Cx-1 + 2 mL 107, IL 150, W 211

I-L-5 dL 103, vL 81, dL/vL 1.27, HA-HC 40, 39, 41, dL/HB 2.64

S-1 L 70, L/ W 11.7, S-2 L 60, L/ W 10.0, interspace 5, L S-1/2 1.17

I-L-6 L 98, HA-HC 28, 29, 32, dL/HB 3.38; L I-L-5/6 1.05

genital field L/W 105/103, Ac-1–3 L 32, 23, 29

gnathosoma vL –; chelicera L 177, L/H 5.2, bS/claw 2.4

Figures

Figure 54. Atractides phreaticus. A–C, ♂ from Switzerland (NHMB); D, ♂ ex coll. Schwoerbel (Krummenbach, Black Forest), E–G ♀ ex coll. Schwoerbel (Wagensteigbach, Black Forest). A, ♂ idiosoma, ventral view; B, ♂ I-L-5 and -6; C, ♂ palp; D, ♂ idiosoma, dorsal view; E, ♀ genital field; F, ♀ palp; G, ♀ I-L-5 and -6. Scale bars = 100 µm.