Parameletus ensiformis, Tiunova, Tatiana M., 2008

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 : 17-19

Parameletus ensiformis sp. nov.

( Figs. 1–7 )

= Parameletus /fg 2 sp. S3: Kluge 2004: 79

Material examined. Holotype. RUSSIA. Khabarovskiy Kray: Bikin River, 50 m lower motor-car bridge, line Vladivostok-Khabarovsk, 16.VI 2005, T Tiunova, 1 male imago.

Paratypes. Together with holotype, 12 male imagines.

Description. Male imago (in alcohol). Dimensions: length (mm): body 15.1–16.8; fore wings 13.0–14.3; cerci 19.8–22.0. Total color of living imago brown tinged with goldish. Head: upper portion of eyes light brown, lower portion black. Thorax: medioscutum and submedioscutum grayish; sublateroscutum brown ( Fig. 7 ). Mesosternum dark brown. Femur and tibia of foreleg brown, tarsal segments light brown. Claw, joints of tibia and tarsus and joints of tarsal segments tinged with brown. Short stout spines located on tibia and first tarsal segment dark brown. General color of middle and hind legs yellowish, joints of tarsal segments and claw brown. Length (mm) of foreleg segments: femora 3.0–3.2; tibiae 2.3–2.4; tarsal segments 1.3–1.6, 1.7–2.0, 1.8–2.0, 1.5–1.7, 1.0–1.2. Wings hyaline, with all veins brown ( Figs. 4–5 ); pterostigma whitish. The ratio of length to the maximal width for fore wing—2.64, hind wing—1.64.

Abdomen: terga 2–7 hyaline tinged with grayish; terga 1 dark brown; terga 8–9 white; terga 2–9 with dark band on posterior margins; lateral part of all terga tinged brown or dark gray. Sterna hyaline tinged with brownish in 2/3 of posterior part; sterna 5–7 or 4–7 with a pair of small round spots in middle part; sterna 9 opaque, brown in posterior and lateral pats. Gonostyli and penis brown and well contrasted with styliger. Styliger with deep posteromedian emargination ( Fig. 6 ). ( Figs. 1–2 ). External lobes of penis dark brown, inner lobes lighter. Both external and inner lobes of penis narrow and long, with pointed apexes; inner lobes reach ¾ lengths of external lobes. Ventral processes dark brown, pointed, reaching middle part of external lobes of penis ( Figs. 2–3 ). Cerci light yellow, base light brown.

Female imago and nymph: Unknown.

Etymology. The epithet ensiformis is connected with form of penis lobes.

Distribution and biology. Known from Russian Far East ( Fig. 8 ). The imagines were collected in grass and on leaves of trees which grow near the water.

Discussion. Male imago of the new species differs from all known species by narrow and long inner and external penis lobes with pointed apices ( Figs. 1–3 ).

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 1 – 7. Parameletus ensiformis: 1. Penis, ventral. 2. Penis, dorsal. 3. Penis, lateral. 4. Fore wing. 5. Hind wing. 6. Styliger and gonostyli. 7. Mesonotum, dorsal. Scale (mm): 1 – 3, 6 = 0.05; 5, 7 = 0.1; 4 = 0.2.