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Issue: Vol. 5594 No. 1: 27 Feb. 2025
Type: Article
Published: 2025-02-27
DOI: 10.11646/zootaxa.5594.1.1
Page range: 1-49
Abstract views: 371
PDF downloaded: 14

Taxonomic review of Epeorus s. l. Eaton, 1881 (Ephemeroptera: Heptageniidae) in Sapporo City and adjacent areas, Hokkaido, Japan

Laboratory of Systematic Entomology; Graduate School of Agriculture; Hokkaido University; Sapporo; Japan; Current affiliation: Yamanashi Forest Research Institute; 2290-1 Saishoji; Fujikawa-cho; Yamanashi; Japan
Laboratory of Systematic Entomology; Graduate School of Agriculture; Hokkaido University; Sapporo; Japan
Ephemeroptera mayfly taxonomy DNA barcoding aquatic insects Asia

Abstract

Three species within the genus Epeorus s. l. Eaton, viz., Epeorus latifolium Uéno, 1928, E. L-nigrum Matsumura, 1931, and E. uenoi (Matsumura, 1933), whose types were collected from Sapporo City, Japan, and neighboring areas, have been confused for a long time. In this study, intensive field sampling and investigation of museum specimens revealed E. latifolium and E. L-nigrum are indeed distinct species, while E. uenoi is a synonym of E. latifolium. Thus, this study partially resolves the taxonomic confusion surrounding Japanese E. latifolium-like species. However, numerous closely related species in Northeast Asia remain challenging to delineate. A critical factor in this taxonomic ambiguity is the definition of subgenus Belovius Tshernova, 1981, as the description of its type species, E. latifolium, was based on a misidentified specimen. Additionally, this study presents morphological features and DNA sequence data for three other related species from the same areas, viz., E. curvatulus Matsumura, 1931; E. aesculus Imanishi, 1934; and E. nipponicus (Uéno, 1931). The subgeneric classification of each species is evaluated following Kluge’s (2004) system, with E. L-nigrum newly assigned to the subgenus Belovius and E. curvatulus to the subgenus Caucasiron Kluge, 1997.

 

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