Momonia (Orientmomonia) koreana, Pešić, 2014

Pešić, Vladimir, 2014, Checklist of the water mites (Acari, Hydrachnidia) of Korea, with description of one new subgenus and two new species, Ecologica Montenegrina 1 (4), pp. 204-230 : 223-224

Momonia (Orientmomonia) koreana n. sp.

( Figs. 5 D­F, 8A­B, 9A­I)

Material examined. Holotype male, dissected and slide mounted, South Korea, CR10 Jeollabuk Province, Ne myeon Mt, stream near Silsung temple, 1.7 km to Jiksopolpol falls , Naebyeansan NP, 0.6 km from Naebyeansan Info Center , 35°64'65.978"N, 126°58'62.285"E, 10.x.2012, Pešić & Choi.

Diagnosis. As for subgenus.

Description

Male – Colour greenish. Idiosoma oval in shape. Sclerotized plates wrinkled. Lateral eyes enlarged. Dorsum with a transverse anterior plate bearing postocular setae, its anterior margin forming a shallow bay for the unpaired frontal organ, and a large, longitudinally wrinkled posterior plate; anterior and posterior plates flanked by ring composed of 7 pairs of platelets, with 1th, 2nd, 4th, 5th, 6th and 7th pairs bearing glandularia, and 4 pairs of tiny sclerites bearing slit organs ( Figs. 5D , 8A ).

Venter nearly covered by ventral shield ( Fig. 8B ); Cx­I+II with distinct medial edges, separated from remainder of venter by an articular membrane; Cxgl­1 located on anterolateral corner of Cx­III, medial margin of Cx­III much longer than medial margin of Cx­IV, Cx­IV with rounded projections covering the IV­L­insertions and on each side a field of about 12 ­16 curved setae in posterolateral part, Cxgl­4 located between Cx­IV and genital field. Genital field ( Fig. 5F ) subterminal, lying between Cx­IV, with three pairs of acetabula in gonopore; 6­8 pairs of genital setae around gonopore; excretory pore and flanking glandularia widely fused to ventral shield.

Palp ( Figs. 5E , 9 F­G): dorsal setae of P­2 and P­3 long and slender, P­4 with a small anterodorsal peg­like seta, two thick ventral setae on a prominent tubercle and four dorsal hair­like setae; P­5 slender, with one main claw flanked by three shorter ones.

I­L modified as characteristic in the genus Momonia ( Figs. 9 A­B); I­L­5 slightly bowed dorsally; III­L­3­5 and IV­L­4­5 each with 3 long swimming setae, all legs with paired main claws bearing dorsal and ventral clawlets, without claw blade ( Fig. 9E ); IV­L­3­5 with pennate setae ( Fig. 9D ).

Measurements: Idiosoma L/W 578/441; anterodorsal plate L/W 97/222 (ratio 0.44); posterodorsal plate L/W 328/313 (ratio 1.05); L of dorsal sclerites (1­7) from anterior to posterior: 81­87, 105­106, 41­42, 78­84, 75, 72­78, 78; Cx­I+II L/W 162/228; genital field: gonopore L/W 75/52

Palp: palp total L 294, dL/H, dL/H ratio: P­1, 34/25, 1.38; P­2, 77.5/, 1.8; P­3, 45/34, 1.33; P­4, 83/21, 3.9; P­5, 54/16.5, 3.3; length ratio P­2/P­4 0.93. Gnathosoma vL 119, chelicera total L 119.

Legs: I­L­5 dL 323, central H 40, dL/central H 8.1; I­L­6 dL 109, maximum H 46, dL/maximum H ratio 2.35; L ratio I­L­5/6 3.0; dL of I­L: 56, 119, 144, 153­162, 323, 108­109; dL of IV­L: 73, 94, 113, 122, 156, 156.

Female – unknown.

Etymology. Named after the country where the new species was detected.

Habitat. A small sandy/bouldary pool near the main stream, shaded by riparian vegetation ( Fig. 11 ).

Distribution. Korea; known only from the type locality.

Figures

Figure 5. Photographs.A­C Albia(Albiella) kseniae n. sp. (A­B – holotype, C – paratype; A mounted in Hoyer’s medium, C photographed immediately after dissection): A, C = dorsal shield, B = ventral shield.D­ F Momonia koreana n. sp. holotype: D = idiosoma, dorsal view; E = palp; F = posterior part of venter.

Figure 8. Momonia (Orientmomonia) koreana n. sp., male: A = idiosoma, dorsal view; B = idiosoma, ventral view. Scale bar = 100µm.

Figure 9.Momonia(Orientmomonia)koreana n. sp., male: A = I­L­4­6; B = I­leg; C = I­L­6; D = IV­leg; E = claw; F­G = palp; H = gnathosoma; I = chelicera. Scale bar = 100µm.

Figure 11. Photo of the type locality (CR10, pool near stream in Naebyeansan National Park, South Korea) ofAlbia kseniaen. sp. andMomonia koreana n. sp. (Photo V. Pešić).