Zachvatkinia larica Mironov, 1989

Han, Yeong-Deok, Song, Ji-Hun & Min, Gi-Sik, 2016, New record of two feather mites (Acari: Sarcoptiformes: Astigmata) from Korea, Journal of Species Research 5 (3), pp. 324-332 : 325-327

1. Zachvatkinia larica Mironov, 1989

ĚDZή날fflẍűΞή (ṳAE) ( Figs. 1­5 )

Synonyms. Zachvatkinia larica Mironov, 1989: 91­115 , figs. 2, 4 and 8.

Material examined. Korea: 5♂♂, 4$$, Dokdo Island, Ulleung­gun , Gyeongsangbuk­do, 37°14′N, 131°52′E, 16 April 2014, collected using vacuum machine from wings and tail feathers in the black­tailed gulls Larus crassirostris by Han Y.­D .

Diagnosis. Male ( Fig. 1 ): Length 660­710 of idiosoma from anterior end to bases of setae h3. Width 370­420 at level of humeral shields. Length of hysterosoma from level of sejugal crease to bases of setae h3 450­520.

Gnathosoma ( Fig. 2A ): Subcapitulum not narrowed in anterior part, lateral margins with small ledge­like extensions. Length 85­125 including palps, width 75­85.

Prodorsal shield ( Fig. 2B ): Length 150­175 along midline, width 190­225, subtriangular shape, narrowed in anterior part, posterolateral part rounded, the posterior edge convex and with a pair of filiform setae vi.

Hysteronotal shield ( Figs. 1 , 2C, D ): Anterior part slightly concave, anterior angles acute, length 425­475 from anterior margin to bases of setae h3, width 260­300 at anterior margin. Terminal cleft extending after level of setae e2, length 215­250 from anterior end to bases of setae h3, width 70­100. Inner margins of opisthosomal lobes with ledge near bases of setae h3. Incision in interlobar membrane extending after level of setae h1, length 145­160 of incision from anterior end to apices of terminal membranes.

Sternum ( Fig. 2E ): Coxal setae 3a locate in same level of setae 4b. Genital shields square or diamond­shaped with rounded posterolateral margin, not fused. Genital setae g situated on the posterolateral edge of genital shield. The anterior end of adanal shields form an acute angle, setae ps3 situated on adanal shields. The additional adanal sclerites oval­shaped, separated from adanal apodemes.

Legs ( Fig. 5 A­D): Tarsi I, II absent apical spine­like processes. Genua I and II with setae mG of filiform. Tarsi III with thick spine­like setae s. Setae W with thin needle­like extension at midlevel. Tarsi IV with 3­4 dorsobasal spines with one apical spine­like extension at base of modified setae e.

Female ( Fig. 3 ): Idiosoma length 425­450, width 315­ 335. Length of hysterosoma from sejugal crease to posterior margin of opisthosoma 385­300.

Gnathosoma ( Fig. 3 ): Shaped as in male, length 75­85 including palps, width 70­90.

Prodorsal shield ( Fig. 4A ): Mostly shaped as in male, with convex at the rear edge between the bases of setae si, length along center line 115­120, width 130­140. Setae se and si situated and lateral margins of prodorsal shield at same horizontal level.

Hysteronotal shield ( Fig. 4B ): Length 185­205 from anterior margins to posterior ends of large longitudinal shields. Setae d1 situated on lateral edge of hysteronotal shield.

Pygidial shield ( Fig. 4C ): With at anterior margin curved shape, length 30­38, width 75­85.

Sternum ( Figs. 3 , 4D ): Epimerites I fused into a Y. Epigynum thin semicircular­shaped, widening to base of anterior genital papillae, length 50­60, width 88­100. Setae g situated posterior to level of setae 3a.

Legs ( Fig. 3 ): Tarsi III, IV slightly longer than wide ( Fig. 5 E­F). Legs IV extend beyond the rear margin of the body.

Remarks. Zachvatkinia larica was originally described by Mironov (1989) based on the specimens collected from L. ridibundus in the Volga delta, Russia.

Zachvatkinia larica is distinguishable from other species in the genus Zachvatkinia by several characteristics in male: (1) the inner margins of the opisthosomal lobes have ledges near the bases of setae h3; (2) three or four dorsobasal spines exist on the tarsi IV; and (3) wedded anterior margin of adanal shield absents protrusion ( Mironov, 1989).

Zachvatkinia larica is very similar to Z. issykkulica ( Chirov, 1978) in external traits. However, Z. larica can be clearly distinguished from Z. issykkulica with the following characteristics in males: the inner margins of opisthosomal lobes have ledges near the bases of setae h3; the additional adanal sclerites are an ovoid shape; setae g situated on the inside of the genital shield ( Mironov, 1989). The morphology of Korean male specimens well agreed with the original descriptions and illustrations that described by Mironov (1989). However, one of five observed males was incompletely fused for the genital shields. We consider this difference to be an intraspecific variation.

Host. This species was found on the surface of wings and tail feathers in the black­tailed gulls Larus crassirostris .

Distribution. Russia ( Mironov, 1989), Korea (This study).

Deposition. NIBR No. NIBRIV0000326276, NIBRIV 0000542813­0000542820.

Molecular characteristics. The COI sequences with 612 bp lengths were obtained from two individuals (GenBank accession numbers: KX610950 and KX610951). The sequence alignment did not contain any insertions or deletions. No frame shift was detected during amino acid conversion with the invertebrate mitochondrial genetic code.

Identifiers. Yeong­Deok Han and Gi­Sik Min.

Family Pterolichidae Trouessart and Mégnin, 1884 ẍIJÑűΞήṻ

Genus Ardeacarus Dubinin, 1951 백로날fflẍűΞή‡ (ṳAE)

Figures

Fig. 1. Zachvatkinia larica, male. Scale bar: 0.2 mm.

Fig. 2. Zachvatkinia larica, male. A, gnathosoma; B, prodorsal shield; C, opisthosomal lobes area view; D, dorsal view of hysteronontal shield; E, ventral viewe of sternum. ad­additional ananal sclerite, ap­adanal apodeme, as­adanl shield, gap­gentital apparatus, gp­genital papillae, gs­genital shield, il­interlobar membrane, in­incision in interlobar membrane, tm­terminal membrane. Scale bars:A­C=0.05 mm, D, E=0.1 mm.

Fig. 3. Zachvatkinia larica, female. Scale bar: 0.2mm.

Fig. 4. Zachvatkinia larica, female. A, prodorsal shield; B, ventral view of pygidial shield area; C, dorsal view of hysteronontal shield; D, ventral viewe of sternum. py­pygidial shield, eg­epigynum, of­oviporus folds. Scale bars:A, B=0.05 mm, C, D=0.1 mm.

Fig. 5. Zachvatkinia larica, legs. A, tarsus, tibia and genu I of male; B, tarsus, tibia and genu II of male; C, tarsus III of male; D, tarsus and tibia IV of male; E, tarsus and tibia of female; F, tarsus and tibia IV of female. as­apical spine­like extension of tarsus IV; db­dorsobasal spine­like extension of tarsus IV. Scale bar: 0.1mm.