Atractides inflatipalpis K. Viets, 1950

Gerecke, Reinhard, 2014, The water mites of the genus Atractides Koch, 1837 (Acari, Hydrachnidia: Hygrobatidae) in Corsica and Sardinia, Zoosystema 36 (4), pp. 735-759 : 750-752

Atractides inflatipalpis K. Viets, 1950

MATERIAL EXAMINED. — Corsica. F 27, 1 ♂, 1 ♀ ; F 29, 1 ♂, 1 ♀; F 50, 1 ♀; F 55, 1 ♀. — Sardinia. I 368, 1 ♀; I 369, 1 ♂; I 384, 1 ♀; I 1154, 2 ♂♂, 2 ♀♀; I 1160, 2 ♀♀ ( MNHN) .

Corsica: HM 05 , 1 ♀ (Coll. HM). — Sardinia: I 384, 2 ♀♀ ; I 1152, 3 ♀♀; I 1154, 11 ♂♂, 13 ♀♀; I 1160, 4 ♂♂, 5 ♀♀; I 1168, 3 ♀♀ (Coll. RG) .

PUBLISHED RECORDS. — Corsica. benf 58, 1 ♂ ; benf 85,

3 ♀♀, 1 dn ( Gerecke & Di Sabatino 2013, MCSNV). DISTRIBUTION. — Mediterranean. Previously reported only from the Balkan peninsula. First record from the area covered ; new for France.

HABITAT. — Rhithrobiont, in the area covered apparently crenophilous. Springs (mostly rheohelocrenes) and low order streams at middle and higher altitude, in the area covered from 350 to 1200 m.

REMARKS

As the variability of this species is still little documented, measurement ranges and some morphological details are here given for the specimens from the area covered.

Both sexes

Glandularia small, round, also dorsocentrally with relatively short setae. Coxae without secondary sclerotization.I-L-5 elongate subrectangular, ventral and dorsal margins slightly diverging from base to S-1 insertion, in the extended area between S-1 and -2 only slightly converging; S-1 long and slender, distally equally narrowed, tip oblique truncated, forming a fine denticle on the inner side; S-2 distinctly shorter, the inner margin strongly inflated in basal half, tip bluntly pointed. Palp with weak sexual dimorphism; P-4 with maximum H near proximoventral seta, sword seta near distoventral seta insertions, proximal and distal ventral sectors shorter than central one.

Males

Idiosoma L/W 500-700/400-500, coxal field L/W 260-350/320-400; Cx-I+II medial L 90-105, lateral L 185-250, W 270-330. I-L-5 dL/vL 155- 210/95-135, ratio 1.5-1.6; HA 43-55, HB 48-63, HC 68-85, ratio dL/HB 3.2-3.4; S-1 L/W 93- 115/7-10, ratio 11,0-14,0; S-2 L/W 75-85/44-15, ratio 5.7-6.7; distance S-1-2, 25-33, L ratio S-1/-2, 1.2-1.4; I-L-6 dL 133-165, HA 24-28, HB 19-20, HC 18-20; ratio dL/HB 7.1-8.3; dL ratio I-L-5/6, 1.17-1.27. Genital field L/W 75-105/100-125, rounded, anterior margin slightly convex, posterior margin with a shallow medial indentation that may be filled with a slightly protruding area of porose secondary sclerite; gonopore L 50-75, acetabula in a curved line, surrounded by about 20 pairs of setae (fine, hair like laterally, longer and stronger medially and at posteromedial edge). Palp total L 285-338; L/H (ratio, rel. L [%]) P-1, 30-35/25-31 (1.1-1.2, 10-11); P-2, 65-78/48-60 (1.3-1.4, 22-23); P-3, 63-80/41-53 (1.5-1.7, 22-24); P-4, 95-110/35-40 (2.7-3.0, 32-33); P-5, 33-40/11-13 (2.6-3.6, 10-12); L ratio P-2/P-4, 0.67-0.72; P-3/P-4, 0.66-0.73. P-2 ventral margin proximally concave, distally convexly protruding, forming a right angle with distal margin; P-3 relatively short and stout, ventral and dorsal margins diverging, distal quarter of ventral margin hyaline P-4 with dense cover of fine, hair-like setae.

Females

Idiosoma L/W 700-900/550-700, coxal field L/W 320-410/380-570; Cx-I+II medial L 90-125, lateral L 210-280, W 320-400. I-L-5 dL/vL 225- 270/135-180, ratio 1.4-1.7; HA 60-81, HB 68-85, HC 103-121, ratio dL/HB 3.0-3.6; S-1 L/W 128- 155/10-13, ratio 10.4-13.5; S-2 L/W 88-110/18-24, ratio 4.3-6.3; distance S-1-2, 40-58, L ratio S-1/-2, 1.3-1.5; I-L-6 dL 185-230, HA 25-30, HB 18-20, HC 21-25; ratio dL/HB 9.3-13.1; dL ratio I-L-5/6, 1.17-1.25. Genital field L/W 120-200/140-220, pre- and postgenital sclerites strong, genital plates L/W 105-135/30-33, weakly curved, anteriorly and posteriorly rounded, bearing 10-12 pairs of fine, hair-like setae; Ac similar in size, occasionally Ac-2 slightly larger than Ac-3. Palp total L 348-432; L/H (ratio, rel. L [%]) P-1, 33-40/33-35 (0.9-1.1, 8-10); P-2, 75-93/50-65 (1.4-1.5, 22-23); P-3, 95-118/43-53 (2.0-2.3, 27-28); P-4, 108-130/30-35 (3.5-3.8, 30-32); P-5, 35-43/13-14 (2.7-3.2, 10-11); L ratio P-2/P-4, 0.70-0.74; P-3/P-4, 0.86-0.92. P-2 straight in proximal quarter, from here to distal edge weakly convex, with slightly rugose surface; P-3 and P-4 long and more slender than in males, ventral margin P- 3 in distal half hyaline.