NEW DEVELOPMENT IN STUDYING THE JURASSIC GENERA:MESOBAETIS BRAUER ET AL., 1889 AND MESONETA BRAUER ET AL.,1889 (INSECTA: EPHEMEROPTERA)
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Abstract:
Two known species of mayfly larvae from Transbaikal of Russia, Mesobaetis sibirica Brauer, Redtenbacher et Ganglbauer, 1889 and Mesoneta antiqua Brauer, Redtenbacher et Ganglbauer, 1889, are actually absent in China although some Chinese paleoentomologists advocated that these have been discovered from China; and some Chinese stratigraphic and paleontological researchers thought that these would be helpful in arriving at a conclusions of the stratigraphic correlation and deducing the geological age. To date, however, the two species are exclusively present in Transbaikal of Russia during the Early Jurassic age. The familial and generic placements of all the species assigned, respectively, into the genera Mesobaetis Brauer, Redtenbacher et Ganglbauer, 1889 and Mesoneta Brauer, Redtenbacher et Ganglbauer, 1889 from China are questionable: Mesobaetis sibirica, M. sanjianfangensis Hong, Liang et Hu, 1995, M. maculata Hong, Liang et Hu, 1995, Mesoneta antiqua and M. beipiaoensis Wang, 1980. The assemblages of mayfly larvae in the Daohugou, Haifanggou, Jiulongshan and Sanjianfang formations are entirely different, and can not be correlated to each other. All mayfly larvae from the Jurassic-Lower Cretaceous of China are lacustrine rather than lotic.
