Lebertia (Mixolebertia) prokini Tuzovskij 2022, sp. n.
Creators: name: Tuzovskij, Petr V.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Lebertiidae
Lebertia
Lebertia prokini

description: Lebertia (Mixolebertia) prokini sp. n.
(Figs. 10–18)
http://zoobank.org/References/ 7D957D63-A03B-41E1-A567-5CEB2AACA492
Material examined. Holotype: male, slide 9945, Asia, Russia, Chukotka, Anadyr District, Elgygytgyn Lake, littoral zone, 67.489177 N, 172.087.142 E, bottom: stones, gravel, 6.08.2020, leg. A. Prokin.
Diagnosis. Integument finely striated, coxal shield slightly wider than long, ml of coxal plates I longer than suture line between coxal plates II, coxal shield embracing the genital field to about 3/4; genital field with three pairs of relatively large unequal acetabula; P-2 ventral seta and ventral margin of segment subequal in length, P-3 with two mediodistal setae located close to dorsodistal seta, P-4 ventral sectors 1:1:2, mediodistal peg-like seta comparatively large; IV-Leg-6 with five to six short, thick ventral setae.
Description. Male. Integument finely striated. Setae Fch (Fig. 10) long, trichobothria Fp, Oi and setae Pi not associated with glandularia (Fig. 11) and other idiosomal setae short and thin (Fig. 12). Coxal shield (Fig. 13) wider than long (L/W ratio 0.85), ml of coxal plates I slightly longer than suture line between coxal plates II (ml Cx-I/Cx-2 ratio 1.05). Coxal plates I fused to each other nearly completely, fragment of suture line present only in their posterior portion. Capitular bay deep U-shaped, genital bay comparatively short and a little wider than long. Posterior margin of coxal plates II rather broad. Coxal shield embracing the genital field to about 3/4 with rounded posteromedial corners.
Pedipalp moderately long (Fig. 14): P-1 short, with single dorsodistal setae; P-2 with three dorsoproximal and two long subequal dorsodistal setae, ventral margin slightly concave, ventrodistal seta long, thickened basally, inserted away from ventrodistal segment edge; P-3 with four distal setae, two mediodistal setae located close to dorsodistal seta, P-4 ventral sectors 1:1:2, mediodistal peg-like seta comparatively large, two to three fine dorsal setae located near middle of segment.
Genital field (Fig. 15) with three pairs of rather large unequal acetabula, first two pairs large than posterior one; flaps with 35–40 medial and three lateral fine setae each; pregenital sclerite without posterior projection. Basal segment of chelicera slender, thickened distally, chela small, sickle-shaped (Fig. 16). Excretory pore unsclerotised.
Legs without swimming setae. IV-Leg-6 with six short, thick ventral setae (Fig. 17). Leg claws with short internal and comparatively long external clawlets, lamella moderately developed with straight ventral margin (Fig. 18).
Measurements (n = 1). Idiosoma L 1100 coxal shield L 850, W 875; coxal plate I mL 225, coxal plate II mL 215, posterior margin of coxal plate II W 85; capitular bay L 250; genital bay 160; genital flap L 235, W 125, genital acetabula (ac-1–3) L 65–75, 70–72, 50–55; pedipalp segments (P-1–5) L: 55, 150, 130, 165, 50, P-4 medio-distal peg-like seta L 16– 19; leg segments L: I-Leg-1–6: 100, 135, 160, 210, 250, 185; II-Leg-1–6: 100, 150, 175, 250, 310, 275; III-Leg-1–6: 125, 160, 185, 310, 375, 310; IV-Leg-1–6: 225, 200, 300, 410, 425, 350.
Female. Unknown.
Differential diagnosis. The present species is similar to Lebertia mamolinensis Tuzovskij, 1982 in the structure of the pedipalps. The adults of L. mamolinensis are characterised by the following features: the integument with irregular rugose sculpturing, Fig. 19; coxal shield embracing the genital field to about 2/3; P-2 ventrodistal seta shorter than ventral margin of segment, P-4 ventral sectors 1:1:1, Fig. 20; IV-Leg-6 with two to three short, thick ventral setae (Tuzovskij 1982). In contrast, in male L. prokini sp. n. the integument smooth; coxal shield embracing the genital field to about ¾, Fig. 13; P-2 ventrodistal seta longer than ventral margin of segment, P-4 ventral sectors 1:1:2, Fig. 14; IV-Leg-6 with five to six short, thick ventral setae (Fig. 17).
Etymology. The species is named after the collector, Dr. Alexandr Prokin.
Habitat. Lakes.
Distribution. Asia, Russia: Chukotka.
description: Published as part of Tuzovskij, Petr V., 2022, Two new water mite species of the genus Lebertia Neuman, 1880 (Acari, Hydrachnidae: Lebertiidae) from northern lakes of Russia, pp. 61-65 in Amurian Zoological Journal XIV (1) on pages 63-65, DOI: 10.33910/2686-9519-2022-14-1-61-65, http://zenodo.org/record/11089000