Unionicola figuralis (Koch 1836) Koch 1836
- Dataset
- Water mites of the genus Unionicola Haldeman, 1842 (Acari, Hydrachnidia, Unionicolidae) in Russia
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Arachnida
- order
- Trombidiformes
- family
- Unionicolidae
- genus
- Unionicola
- species
- Unionicola figuralis
description
Description. Both sexes. Dorsal platelets not developed. Anterior and posterior coxal groups (Fig. 8 A) divided by rather wide interspace; sclerites, bearing setae and glandularia Le, small. Apodemes of first coxal group reaching or extending to anterior margin of third coxae. Coxal plates III + IV subquadrate (L / W ratio 0.95 – 1.2) with straight medial margin. Surface of all coxal plates with reticulations. Pedipalps (Fig. 9 A) short and stocky, P- 2 with four subequal setae, P- 3 with two unequal distal setae, lateral seta longer than dorsal one; P- 4 tapering distally, with two long and one short ventral tubercles, long proximal tubercle and short tubercle each bearing thin short seta and one long ventrodistal tubercle bearing short peg-like seta; P- 5 long with slightly concave ventral margin, all dorsodistal spines very short. Legs II – IV long, slender; all segments, except trochanter, cylindrical and with swimming setae. The number of distal swimming setae on legs IV is follows (Fig. 9 B): one on telofemur, three on genu and tibia. Swimming setae on leg II shorter than swimming setae on legs III – IV; swimming setae on IV-Leg- 5 much shorter than IV-Leg- 6. Claws of legs I (Fig. 9 C) thick, hook-like with two unequal clawlets; claws of legs II – IV sickle-shaped with short dorsal clawlet and long ventral one (Fig. 9 D). Female. Anterior genital plates wide without anterior subcutaneous accretion each, with two long, thick subequal setae and two rather thick, long setae each; posterior plates more or less triangular, with 1 long, thick anteromedial seta, each with 4 – 6 thin setae; acetabula small and occupy less than one half of each plate (Fig. 8 B). Measurements (n = 10). Idiosoma L 810 – 1150; coxae III + IV L 350 – 390, W 310 – 400; anterior genital plates L 60 – 75, W 85 – 100; posterior genital plates L 85 – 100, W 85 – 100; pedipalpal segments (P- 1 – 5) L: 24 – 33, 120 – 145. 65 – 82, 114 – 150, 114 – 147; leg segments L: I-Leg- 1 – 6 — 95 – 125, 260 – 310, 275 – 350, 400 – 490, 315 – 385, 325 – 385; II-Leg- 1 – 6 — 95 – 125, 315 – 350, 415 – 450, 550 – 620, 595 – 695, 575 – 645; III-Leg- 1 – 6 — 90 – 115, 265 – 285, 315 – 360, 364 – 425, 415 – 490, 365 – 415; IV-Leg- 1 – 6 — 170 – 190, 260 – 295, 380 – 435, 495 – 590, 570 – 670, 530 – 645. Male. Genital plates (Fig. 8 C) wide, fused to each other by anterior and posterior ends, with 8 – 10 thin setae on each side; in additional, one pair of genital setae located on soft integument flanking genital field. All acetabula approximately equal in size. Measurements (n = 8). Idiosoma L 850 – 900; coxae III + IV L 275 – 325, W 260 – 315; genital field L 185 – 200, W 200 – 225; pedipalpal segments (P- 1 – 5) L: 24 – 32, 105 – 125, 55 – 65, 95 – 105, 95 – 105; leg segments L: I-Leg- 1 – 6 — 90 – 105, 235 – 295, 265 – 305, 390 – 450, 305 – 345, 305 – 350; II-Leg- 1 – 6 — 90 – 105, 285 – 345, 430 – 485, 510 – 590, 550 – 620, 445 – 500; III-Leg- 1 – 6 — 90 – 105, 240 – 260, 285 – 325, 355 – 385, 405 – 465, 340 – 370; IV-Leg- 1 – 6 — 135 – 165, 240 – 270, 350 – 400, 480 – 540, 570 – 655, 505 – 570. Deutonymph. See Hevers (1979). Larva. See Tuzovskij (2012). Habitat. Lakes, ponds, running waters. Hosts. Unknown.
diagnosis
Diagnosis. Adults. Dorsal platelets not developed; medial margin of coxal plates III + IV straight and nearly as long as wide; P- 3 with two unequal distal setae, lateral seta longer than dorsal one, P- 4 tapering distally, with two long and one short ventral tubercles, P- 5 long with slightly concave ventral margin, all dorsodistal spines very short; anterior genital plates of female without anterior subcutaneous projections, each with two rather thick, long setae, posterior plates more or less triangular, each with one long, thick anteromedial seta and 4 – 6 thin setae; genital plates of male wide, fused to each other by anterior and posterior ends; swimming setae on IV-Leg- 5 much shorter than IV-Leg- 6, the latter with 3 thickened setae; claws of legs I thick, hook-like, claws of legs II – IV thin, sickle-shaped.
distribution
Distribution. Europe, Asia, Africa, North and South America (Viets 1956; Sokolow 1940; Lundblad 1968; Viets 1978).
materials_examined
Material examined. 5 males, 5 females: Russia, Magadan Province, Anadyr District, small lakes near settlement Markovo, July – September 1981; 2 females: Samara Province, Stavropol District, National natural Park “ Samarskaya Luka ”, Gusinoe Lake, July 1992; 3 males, 3 females: Yaroslavl Province, Nekouz District, Rybinsk reservoir near settlement Borok, September – October 2003, 2013, leg. P. V. Tuzovskij. All males and females are collected free-swimming.