Ephemera strigata Eaton, 1892

Mayorga, Alfredo, Kang, Ji Hyoun & Bae, Yeon Jae, 2024, Taxonomic review of Korean Ephemera Linnaeus with lectotype designation of E. sachalinensis Matsumura (Insecta: Ephemeroptera: Ephemeridae), Journal of Species Research 13 (4), pp. 423-433 : 429

Ephemera strigata Eaton, 1892 ( Figs. 1J, 1K, 1L , 4D,

4H, 5D )

Ephemera strigata Eaton 1892: 302 ; Tshernova, 1973: 332; Gose, 1981: 16.

Specimens examined. South Korea: Gyeonggi-do: 4 male imagoes & 4 female imagoes, Gapyeong, 2003-V-18, 2013-VI-9. Gangwon-do: 36 larvae, 2 male subimagoes , 15 male imagoes & 26 female imagoes, Jeongseon, 2018-V-6-7, 2018-VI-2, Park SH, Kim JS, Mayorga A. Chungcheongbuk-do: 12 larvae, Danyang, 2007-VIII-25 , Bae YJ.

Diagnosis. Abdominal tergum I pale with a pair of dark thick lateral bars. Abdominal terga V- IX with a pair of dark thick lateral bars reaching the median area basally ( Fig. 1J, 1K ). Adult: Forewings transparent with dark brown marks on crossveins; costal area dark brown; CuA- MP2 not fused ( Fig. 1L ). Male genital lobes wide Y-shaped with a slight inner concavity; forks apex curved inertly; penis without distinct titillators ( Fig. 5D ).

Mature larva. Generally similar to adults in abdominal markings. Posterior margin of tergum X quadrilateralshaped ( Fig. 4H ).

Distribution. China, Japan [type locality], Korea, Mongolia, Russia.

Remarks. This species has been frequently treated as an ecological model species of life history studies, intermediate host of nematodes, and population analysis using machine-learning techniques ( Gose, 1970; Kuroda et al., 1984; Takemon, 1990; Hirasawa and Urabe, 2003; Li et al., 2020).

In some immature larval specimens (7-12 mm in body length), abdominal terga VIII- IX are completely dark with a pair of pale median stripes, but this pigmentation changes to typical larval markings in the mature larvae.

Figures

Fig. 1. Adults of South Korean Ephemera Linnaeus:A. male E. orientalis McLachlan; B. female E. orientalis; C. male wings of E. orientalis; D. male E. sachalinensis Matsumura; E. female E. sachalinensis; F. male wings E. sachalinensis; G. male E. separigata Bae; H. female E. separigata Eaton; I. male wings E. separigata; J. male E. strigata Bae; K. female E. strigata; L. male wings E. strigata.

Fig. 4. South Korean Ephemera Linnaeus larvae: A. E. orientalis McLachlan; B. E. sachalinensis Matsumura; C. E. separigata Bae; D. E. strigata Eaton. Posterior margin of tergum X of South Korean Ephemera larvae: E. E. orientalis; F. E. sachalinensis; G. E. separigata; H. E. strigata. Claw of foreleg of the larvae: I. E. orientalis; J. E. sachalinensis.

Fig. 5. Male genitalia of South Korean Ephemera Linnaeus males: A. E. orientalis McLachlan; B. E. sachalinensis Matsumura; C. E. separigata Bae; D. E. strigata Eaton.