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ISSN : 1225-0171(Print)
ISSN : 2287-545X(Online)
Korean Journal of Applied Entomology Vol.58 No.1 pp.85-87

A New Species of the Genus Euseius (Acari: Phytoseiidae) from Ulleungdo Island in Korea

A Young Kim, Hong Yul Seo, Myon Ok Ryu*
Animal Resources Division, National Institute of Biological Resources, Incheon 22689, Korea
*Corresponding author:
January 29, 2019 February 20, 2019 February 24, 2019


A new species, Euseius ulleungensis sp. nov. is described from Korea. The new species was collected on Aster glehni Fr. Schm. at Jeodong, Ulleung-up, Ulleung-gun, Gyeongsangbuk-do.

울릉도산 순모이리응애속(Acari: Phytoseiidae) 1신종 보고

김아영, 서홍렬, 류면옥*
국립생물자원관 동물자원과


신종인 울릉이리응애(Euseius ulleungensis) (신칭)를 기재한다. 이 신종은 울릉도 섬쑥부쟁이에서 채집되었다.

    Many species of the phytoseiid mites are predaceous mites that occur on a wide range of plants in association with phytophagous mites and insect pests.

    There are 213 nominal species in the genus Euseius in the world (Demite et al., 2014). Among them, only one species, Euseius finlandicus has been recorded from Korea (Ryu, 2007, 2012).

    In this study, Euseius ulleungensis is described as new to science, based on five female specimens collected at Ulleungdo Island.

    Materials and Methods

    The materials were collected from the leaves of Aster glehni Fr. Schm. at Jeodong, Ulleung-up, Ulleung-gun, Gyeongsangbuk- do. Korea. The specimens were mounted on slide glass in Hoyer’s medium and overnight on hot plate at 40℃. The setal nomenclature was based on that of Rowell et al. (1978). All measurements are given in micrometers. Length of dorsal shield is distance between setae j1 and J5, width of that is distance between base of the seta s4. The type series of the new species are deposited in the collection of National Institution of Biological Resources (NIBR), Korea.

    Taxonomic accounts

    Family Phytoseiidae Berlese, 1916 이리응애과

    Subfamily Amblyseiinae Muma, 1961 순이리응애아과

    Genus EuseiusWainstein, 1962 순모이리응애속

    Type species: Seiulus finlandicusOudemans, 1915.

    Euseius: Muma and Denmark, 1970: 92; Moraes et al., 1986: 35; Chant and McMurtry, 2005: 209; 2007: 118; Ryu, 2007: 253; Ryu, 2012: 34.

    Euseius ulleungensis Ryu sp. nov. 울릉이리응애(신칭) (Fig. 1)

    Female. Dorsal shield lightly reticulated laterally; 330 long, 203 wide; at least 3 pairs of small pores. Setae on dorsal shield: Z5 being longest; j1 slightly longer than j3 and s4; remaining setae much shorter, smooth. Peritreme short, extending between z2 and j3. Sternal shield with invisible posterior margin, with 3 pairs of setae; no metasternal platelets. Ventrianal shield much longer than wide, narrower than genital shield, with lateral margins slightly convex; 3 pairs of preanal setae, 2 pairs of them (JV2 and ZV2) being arranged in a transverse line on the anterior part of the preanal region; 1 pair of crescentric preanal pores caudal to posterior pair of preanals (JV2). Setae JV5 smooth. 1 pair of slender metapodal platelets. Spermatheca with funnel-shaped cervix; atrium well developed (Fig. 1D and E). Fixed digit of chelicera 4 teeth; movable digit with unidentate. Chaetotaxic formula; genu II, 2-2/0, 2/0-1; genu III, 1-2/1 2/0-1. Leg IV with 3 macrosetae, genu, tibia, and basitarsus; macroseta on basitarsus much longer than that on tibia and genu. Lengths of setae (n = 5, mean): j1 31.3, j3 25.7, j4 8.5, j5 9.1, j6 11.5, J2 12.8, J5 4.9, z2 17.9, z4 17.4, z5 9.9, Z1 12.3, Z4 14.3, Z5 55.2, s4 27.6, S2 18.5, S4 20.8, S5 22.0, r3 13.6, R1 13.5, JV5 30.2, macrosetae on leg IV; genu 35.8, tibia 36.0, basitarsus 56.3.

    Male. Not Known

    Type series. Holotype: ♀, 13. VII. 2018 (Ryu leg.), on Aster glehni Fr. Schm. at Jeodong, Ulleung-up, Ulleung-gun, Gyeongsangbuk-do (NIBRIV0000834887). Paratypes: 4♀♀, same data as holotype (NIBRIV0000834888~91).

    Etymology. The specific name is derived from the type locality, Ulleungdo Island

    Remarks.E. ulleungensis sp. nov. resembles E. ovalis (Evans, 1953), E. sojaensis (Ehara, 1964), E. aizawai (Ehara and Bhandhufalck, 1977), E. ovaloides (Blommers, 1974) and E. australis (Wu and Li, 1983). But the female of E. ulleungensis differs from the female of those species by the shape of the spermatheca. Futhermore, the female of E. ulleungensis differs from that of E. ovalis by the relative lengths of setae J1 and j3, the female of E. sojaensis by the relative lengths of macrosetae on Leg VI and having dorsal shield reticulate along lateral margins, the female of E. aizawai by the relative lengths of macrosetae on leg VI, the female of E. ovaloides by the relative lengths of macrosetae on Leg VI and the number of teeth on fixed digit and the female of E. australis by the relative lengths of macrosetae on Leg VI and having dorsal shield reticulate along lateral margins.


    We are thank to Dr. Jin Seok Kim, the faculty of NIBR, for identification of the host plant. This work was supported by a grant from the National Institute of Biological Resources (NIBR), Korea (NIBR201811102).


    Euseius ulleungensis sp. nov. (♀) A, Dorsum of idiosoma; B, Sternal shield; C, Posterior ventral surface; D-E, Spermatheca; F, Chelicera; G, Basitarsus, tibia and genu of leg IV. (Scales: A, B, C, G = 50 μm; D, E = 10 μm; F = 20 μm)


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