Megaphthalmoides unilineatus ( Zetterstedt, 1838 )

Iwasa, Mitsuhiro, 2021, Three new species and six new records of Scathophagidae (Diptera) from Japan with a key to the Japanese genera, Zootaxa 4981 (3), pp. 531-553 : 543-544

Megaphthalmoides unilineatus ( Zetterstedt, 1838)

[Japanese name: Kiiro-sesuji-funbae]

( Figs 34–37 )

Cordylura unilineata Zetterstedt, 1838: 727 . Type-locality: “Nordlandia…Bjorkvik” [ Norway].

Material examined. Hokkaido, 3 ♂, 2 ♀, Mt. Kurodake (1900 m), Kamikawa , 24.vii. 1996, leg. M. Iwasa ; 1♂, Kogen-onsen (1300 m), Mt. Daisetsu, Kamikawa , 21. vii. 2016, leg. M. Iwasa ; 3 ♀, same locality, 6 viii. 2016, leg. M. Iwasa ; 1 ♂, same locality, 2. viii. 2012, leg. S. Shinonaga ; 1 ♀, Ginsendai (1500 m), Mt. Daisetsu, Kamikawa , 5. viii. 1998, leg. M. Iwasa ; 1 ♀, Nukabira , 28. vii. 1987, Tokachi, leg. M. Iwasa ; 1 ♀, Mt. Tsurugi, Hidaka range, Tokachi , 25. vii. 1978, leg. M. Iwasa.

Diagnosis. This species is medium-sized species and characterized as follows: head yellow except for eyes; postpedicel black in apical two-thirds and yellow in basal one-third ( Fig. 34 ); arista short-haired; thorax yellow with a longitudinal stripe on prescutum to scutum; abdominal tergites yellow and each tergite with a horizontal black line on posterior margin; male sternite V bilobate posteriorly ( Fig. 35 ); male surstyli long, slender, and tapered apically ( Figs 36, 37 ); cerci clothed with strong setulae.

Distribution. Europe, Russia (the European part, Siberia, the Far East), North America ( Ozerov and Krivosheina 2014), Japan (Hokkaido). New to Japan.

Body length (♂ ♀). 5.5–6.0 mm.

Remarks. This species is easily distinguished from M. japonicus Ozerov by the characteristics mentioned in the key below.

Figures

FIGURES 34–37. Megaphthalmoides unilineatus (Zetterstedt). 34, Male postpedicel and pedicel, left lateral view; 35, Male sternite V, ventral view; 36, Male terminalia, left lateral view; 37, Male terminalia, posterior view.