Parameletus chelifer Bengtsson 1908

Tiunova, Tatiana M., 2008, Two new species of Parameletus Bengtsson, 1908 (Ephemeroptera: Siphlonuridae), and notes on other species from the Far East of Russia, Zootaxa 1725, pp. 17-26 : 21-23

Parameletus chelifer Bengtsson 1908

( Figs. 16–23 )

Eatonia borealis Bengtsson, 1904:131 , nomen nudum. Parameletus chelifer Bengtsson, 1908:242 . Sparrea norvegica Esben-Petersen, 1909:554 . Potameis elegans Bengtsson, 1909:15 .

Palmenia fennica Aro, 1910:31 .

Material examined. RUSSIA. Southern Yakutia: Ungra River Basin, Yuhktinka stream, mouth, light tributary of Yuhkta River, 30.VII 2006, T. Tiunova, 14 male imagines, 3 female imagines. Amurskaya Oblast’: Zeya Reservoir’s Basin, Artemii River, 50 m lower motor-car bridge, line Zeya-Verhknezeisk Town, 21.VI 2004, T Tiunova, 17 larvae; Zeya Reservoir’s Basin, Giluy River, near river crossing, 19.VI 2004, T Tiunova, 1 male imago (reared from nymph); Amur River Basin, upper part of Talali River, 25.VIII 2004, T Tiunova, 20 male imagines, 13 female imagines. Khabarovskiy Kray: Priochot’e, Ul’ya River Basin, Khetana River, 7 km upper mouth, 22.VII 1985, V Zherikhin, 1 male imago; same place, 11–17.VIII 1985. V Zherikhin, 5 male imagines, 6 female imagines; Ayano-Majskiy Region, Ujka River Basin, stream, 300 m upper mouth, left tributary of Uika River, near airport, 23.VII 1989, T Tiunova, 6 male imagines (reared from nymph). Primorskiy Kray: Ussuri River Basin, Otkosnaya River, left tributary of Ussuri River, lower motor-car bridge, 16.VI 1998, T Tiunova, 1 male imago.

Male imago. Dimensions: length (mm): body 12.8–15.0; fore wings 12.0–13.1; cerci 17.2–22.4. Total color of living imago dark brown. Head: upper portion of eyes light brown or light gray. Thorax: medioscutum and submedioscutum brown; sublateroscutum and posterior scutal protuberance dark brown ( Fig. 23 ); mesosternum from dark brown to dark. Fore legs brown, middle and hind legs from light brown to yellowish. Length (mm) of foreleg segments: femora 2.7–3.1; tibia 2.4–2.7; tarsal segments 1.4–1.7, 1.5–1.9, 1.6–1.9, 1.3–1.6, 0.8–1.0. The ratio of length to the maximal width for fore wing—2.40 ( Fig. 20 ), hind wing—1.47 ( Fig. 21 ). Abdomen: terga 2–9 opaque with pair of elongated dark brown spots in middle part; lateral part of posterior margins darkened. Sterna brown, sterna 7–9 dark brown, opaque. Forceps brown, styliger plate dark brown. Middle part of posterior margin of styliger protuberant, wavy ( Fig. 22 ). Penis lobes from dark brown up to black. External penis lobes wide with rounded apices; inner lobes straight, narrowed toward apex, with furcated top ( Figs. 16–17 ). Ventral processes dark brown, pointed, reach ½ of length of external lobes ( Figs. 17, 19 ). Cerci brown, with base darker.

Distribution. Parameletus chelifer has Holarctic distribution, occupying North America ( McCafferty 1996), Europe ( Söderström & Nilson 1986; Tshernova et al. 1986), Siberia, and Russian Far East ( Tshernova et al. 1986; Kluge 1997; Tiunova 2007) ( Fig. 8 ). Larvae of P. chelifer are found in small streams with cool water.

Figures

FIGURE 8. Study area. The thick line indicates the border between administration regions. 1 – Primorskiy Kray, 2 – Khabarovskiy Kray, 3 – Sakhalinskaya Oblast’, 4 – Magadanskaya Oblast’, 5 – Kamchatskaya Oblast’, 6 – Chukotka, 7 – Evreiskaya Autonomous Oblast’, 8 – Amurskaya Oblast’, 9 – Chitinskaya Oblast’, 10 – Republic Sakha Yakutia.

FIGURES 16 – 23. Parameletus chelifer: 16. Penis, ventral. 17. Penis, dorsal. 18. Penis, lateral (Uika River). 19. Penis, lateral (Khetana River). 20. Fore wing. 21. Hind wing. 22. Styliger and gonostyli. 23. Mesonotum, dorsal. Scale (mm): 16 – 19 = 0.02; 21, 23 = 0.1; 22 = 0.05.