Cylindrotoma americana Osten Sacken, 1865, stat. reval.

Kolcsar, Levente-Peter, Paramonov, Nikolai, Imada, Yume, Kato, Daichi, Gamboa, Maribet, Shinoka, Dai, Kato, Makoto & Watanabe, Kozo, 2022, Notes on the taxonomic status and distribution of some Cylindrotomidae (Diptera, Tipuloidea), with emphasis on Japanese species, ZooKeys 1083, pp. 13-88 : 13

Cylindrotoma americana Osten Sacken, 1865, stat. reval.

Figs 6N, O, P , 7K

Cylindrotoma juncta Coquillett, 1900

Cylindrotoma splendens Doane, 1900

Cylindrotoma pallescens Alexander, 1931.

Non-type material examined.

Canada • 1 ♂; British Columbia, Cowichan Valley, Upper Carmanah Valley; 48.616°N, 124.733° W; alt. 95 m; 4 Jul. 1991 - 15 Aug. 1991; N. Winchester leg.; CKLP. • 1 ♀; British Columbia, Cowichan Valley, Upper Carmanah Valley; 48.67°N, 124.69° W; alt. 160 m; 4 Jul. 1991 - 15 Aug. 1991; N. Winchester leg.; CKLP. Usa • 1 ♂, 1 ♀; Alaska, Juneau; 58.37°N, 134.54° W; alt. 330 m; 14 Jun. 1988; F. Brodo leg.; CKLP.

Comparative diagnosis.

General appearance, colouration, antennal structure, and male and female terminalia are very similar to C. distinctissima . Differences: only the ventral margin of the inner gonocoxal lobe are sclerotised (Fig. 6N ) (the lateral margin is also sclerotised in C. distinctissima (Fig. 6D, E ). Sheath of aedeagus shorter and wider (Fig. 6P ) than in C. distinctissima (Fig. 6L, M ). Aedeagus does not narrow to the tip in this species, the lateral margin being almost straight (Fig. 6P ) (in C. distinctissima the aedeagus clearly narrows to the tip, starting from around the middle in Japanese specimens (Fig. 6M ). Spermathecae small (Fig. 7K ), diameter ~ 0.07-0.1 of the width of sternite 8 (in C. distinctissima relatively large, 0.15-0.2 of the width of sternite 8).

For a detailed species description see Brodo (1967) under " Cylindrotoma distinctissima americana ".

Distribution.

Widely distributed species in Nearctic, known from Canada and USA (Alaska to Oregon and Colorado, in the east from Labrador and Newfoundland to Ontario and Pennsylvania) ( Oosterbroek 2021).

Figures

Figure 6. Male genital structures of Cylindrotoma distinctissima (Meigen, 1818) (A-M), in comparison to C. americana Osten Sacken, 1865 (N-P) A terminalia, dorsal view B terminalia, ventral view C terminalia, lateral view; D Apical lobe of the gonocoxite (Japan) E apical lobe of the gonocoxite (Finland) F shape of the gonostylus caudal view (Japan) G shape of the gonostylus caudal view - Finland H aedeagus complex, dorsal view I aedeagus complex, ventral view J aedeagus complex, lateral view K tip of the aedeagus L shape of the aedeagus (Japan) M shape of the aedeagus (Finland); C. americana Osten Sacken N apical lobe of the gonocoxite O shape of the gonostylus caudal view P shape of the aedeagus. Abbreviations: ae - aedeagus; al - gonocoxite apical lobe; eja - ejaculatory apodeme; gc - gonocoxite; gs - gonostylus; ib - interbase; pm - paramere; sp - sperm pump; s 9 - sternite 9; t 9 - tergite 9; vl - gonocoxite ventral lobe.

Figure 7. Female genital structures of Cylindrotoma distinctissima (Meigen, 1818) (A-J) and C. americana Osten Sacken, 1865 (K) A terminalia, dorsal view B terminalia, lateral view C shape variant of median lobe of tergite 10 (Krasnodar Krai, Russia) D shape variant of median lobe of tergite 10 (Finland) E sternite 8 and hypogynial valves, inner dorsal view F shape variant of tip of the hypogynial valve G sternite 10 H genital opening and sperm ducts I spermathecae (Japan) J spermathecae (Finland) K spermathecae of C. americana Osten Sacken, 1865. Abbreviations: ce - cutting edge; crc - cercus; hv - hypogynial valve; t 8 - tergite 8; t 9 - tergite 9; t 10 - tergite 10; t 10 s - tergite 10 triangular sclerite; t 10 ll - tergite 10 lateral lobe; s 8 - stergite 8.