Bychovskiata hypoleuci Mironov and Dabert, 1997

Min, Yeong-Deok Han and Gi-Sik, 2019, New record of two feather mites (Acari: Sarcoptiformes: Astigmata) isolated from Actitis hypoleucos in South Korea, Journal of Species Research 8 (2), pp. 225-232 : 227-228

1. Bychovskiata hypoleuci Mironov and Dabert, 1997

ḂṈAE요Ḫd날fflẍűΞή (ljḍ) ( Figs. 1 , 2 )

Synonyms. Bychovskiata hypoleuci : Mironov and Dabert,

1997, p. 96, 100-102, figs. 9, 21-22, figs. 16-17, 19; Dabert, 2000, p. 306.

Material examined. Korea: 4♂♂, 3$$, Jeongsanmyeon, Cheongyang-gun , Chungcheongnam-do, 36°22 ʹ 34 ʺ N, 126°56 ʹ 38 ʺ E, 12 Sept 2014, collected using vacuum machine from flight feathers on the wings of the common sandpiper Actitis hypoleucos by Han Y.-D .

Diagnosis. Male: Length 330-345 of idiosoma from anterior end to bases of setae h3, width 185-220 at level of humeral shields, length to width ratio 1.6-1.8 ( Fig. 1A ). Prodorsal shield ( Fig. 1B ): Surface without striation, posterior angles acute, posterior margin slightly convex as wide blunt angle, length 75-85 along midline, width 100- 105 at posterior part. Hysteronotal shield ( Fig. 1C ): Anterior part straight, lateral margins with small rounded extensions at level of setae cp, length 240-243 from anterior margin to bases of setae h3, width 165-180 at level of setae d1. Opisthosomal lobes bluntly round-shaped and short. Terminal cleft broad V-shaped and short, anterior margin round-shaped. Interlobar membrane form narrow band along terminal apex of opisthosoma. Sternum ( Fig. 1D ): Epimerites I fee, posterior ends not connected with epimerites II. Ventral margin of humeral shield with setae c3. Genital apparatus short and stiletto-shaped, situated between levels of trochanters IV. Posterior genital papillae situated at level of genital apparatus. Adanal shields irregularly transverse stick-shaped, setae ps3 situated on this shield.

Female: Idiosoma length 390-405, width 215-225 ( Fig. 2A ). Prodorsal shield ( Fig. 2B ): Mostly shaped as in male, without transversal striation, length along middle line 85- 88, width 105-115 at posterior part. Hysteronotal shield ( Fig. 2C ): Shaped as in male, lateral margins with small rounded extensions at level of setae cp, surface without dotted lacunae, length 295-300, width 180-190. Opisthosoma terminus round-shaped. Setae e1 and h1 microchaetae. Heavy sclerotized membrane situated between posterior margin of opisthosoma and setae h3. Sternum ( Fig. 2D ): epimerites I shaped as in male. Epigynum simecircular-shaped, length 68-73, width 48-50 at posterior margins. Legs IV extending to posterior margin of opisthosoma.

Remarks. Bychovskiata hypoleuci was originally describ- ed by Mironov and Dabert, 1997 based on specimens collected from Actitis hypoleucos in Russia.

Bychovskiata hypoleuci is distinguishable from other species of the genus Bychovskiata by the presence of several characteristics: (1) transverse striation of prodorsal shield is absent; (2) idiosoma length is longer than 330 in males; and (3) small adanal shields are located at the bases of setae ps 3 in males; and (4) leg IV does not extend beyond the posterior end of opisthosoma in females ( Mironov and Dabert, 1997).

Bychovskiata hypoleuci is very similar to B. dubia Mironov and Dabert, 1997 and B. macularii Mironov and Dabert, 1997 with regard to external traits. However, B. hypoleuci can be clearly distinguished from B. dubia and B. macularii by the following characteristics: length of idiosoma is more than 330 in males; small adanal shields are situated at the bases of setae ps 3 in males; and leg IV does not extend over the posterior margin of opisthosoma in females ( Mironov and Dabert, 1997). The Korean specimens were morphologically consistent with the original descriptions and illustrations provided by Mironov and Dabert, 1997. However, the adanal shields of the four

Korean males are irregularly formed around of setae ps3. Nonetheless, these Korean males have the same partial CO1 sequences (654 bp). Therefore, we consider this difference to be intraspecific variation.

Host. This species was found on wing feathers in the common sandpiper Actitis hypoleucos .

Distribution. Kirghizia, Russia ( Mironov and Dabert, 1997), Korea (this study).

Deposition. NIBR No. NIBRIV0000833401-NIBRIV00 00833407.

Molecular characteristics. The COI sequences were obtained from four individuals and deposited in GenBank with accession numbers of No. MK031707-MK031710.

Family Syringobiidae Trouessart, 1896 ẍŵűΞήṻ (ṉḡ)

Genus Phyllochaeta Dubinin, 1951 ḆqẍŵűΞήṧ (ṉḡ)

Figures

Fig. 1. Bychovskiata hypoleuci, male; A, dorsal view; B, dorsal view of prodorsal shield; C, dorsal view of hysteronotal shield; D, ventral view of hysterosoma; as - adanal shield, gap -genital apparatus, gla - opening of dorsal hysteronotal glands. Scale bars: A, 0.2 mm; B, 0.05 mm; C, D, 0.1 mm.

Fig. 2. Bychovskiata hypoleuci, female; A, dorsal view; B, dorsal view of prodorsal shield; C, dorsal view of hysteronotal shield; D, dorsal view of hysterosoma; eg -epigynum. Scale bars:A, 0.25mm; B, 0.05mm; C, D, 0.1 mm.