Redescription of two species of the genus Ochthera Latreille 1802 (Diptera: Ephydridae) from Taiwan

摘要

Using recently collected material trom laiwanese localities where Sauter collected in the early 20th century, the present study redescribes 2 species and renames "O. sauteri" of Zhang and Yang (2006) as Ochthera mudigerensis (Zhang & Yang 2006).Ochthera Latreille 1802 is one of the most distinctive genera of shore flies (Ephydridae). Species reported from Taiwan (Formosa) include O. circularis Cresson 1926, O. pilimana Becker 1903 (= O. canescens Cresson 1931) and O. sauteri Cresson 1932 (Cresson 1926, 1931,1932). Studies have reported other species of Ochthera (O.japonica Clausen 1977, 0. macrothrix Clausen 1977, O. mantis De Geer 1782, O. guangdongensis Zhang & Yong 2006 and O. hainanensis Zhang & Yong 2006) from neighboring countries: Japan, China and Korea (Miyagi 1966, 1977; Clausen 1977; Zhang & Yang 2006; Sang & Yong 2009). Ochthera circularis and O. sauteri are similar but can be distinguished by morphological characters of males, i.e., Cresson described the male of O. circularis as having three long setae in a circular indentation at the apex of the fore basitarsomere; whereas males of O. sauteri have the same number of longitudinal setulae but these converge and twist together at their tips, and there is an elliptical indentation at the base of the tooth on the posterior side (Figs. 1-3) (Cresson 1926, 1932).