Abstract
The larvae of Cincticostella bifurcata sp. nov. and C. szechuanensis sp. nov. have obvious and well-developed proand mesothoracic projections, which indicates that they belong to the ephemerellid genus Cincticostella. These larvae have unique characters within the genus. Cincticostella bifurcata sp. nov. has bifurcated abdominal tubercles on terga 5–8, and C. szechuanensis sp. nov. has no prominent, paired processes on the abdominal terga. The evolutionary trend of this genus is assumed to be a flattening and decrease in size of the body and a reduction or loss of the maxillary palpi. A key to all known larvae of the genus is provided.References
Allen, R.K. (1971) New Asian Ephemerella with notes (Ephemerellidae). The Canadian Entomologist, 103, 512–528.
Allen, R.K. (1975) Ephemerella (Cincticostella): A revision of the nymphal stages. The Pan-Pacific Entomologist, 51, 16–22.
Allen, R.K. (1980) Geographic distribution and reclassification of the subfamily Ephemerellinae (Ephemeroptera: Ephemerellidae). In: Flannagan, J. F. & Marshall, K. E. (Eds.), Advances in Ephemeroptera Biology. Plenum Press, New York, pp. 71–91.
Braasch, D. (1981) Beitrag zur Kenntnis der Ephemerellidae des Himalaya (Ephemeroptera). Reichenbachia, 19, 85–88.
Ishiwata, S. (2003) A revision of the genus Cincticostella (Insecta: Ephemeroptera: Ephemerellidae) from Japan. Species Diversity, 8, 311–346.
Jacobus, L.M. & McCafferty, W.P. (2003) Revisions to the genus Crinitella (Ephemeroptera: Ephemerellidae). Journal of the New York Entomological Society, 111, 48–50.
Jacobus, L.M. & McCafferty, W.P. (2008) Revision of Ephemerellidae Genera (Ephemeroptera). Transactions of the American Entomological Society, 134 (1+2), 185–274.
Jacobus, L.M., McCafferty, W.P. & Sites, R.W. (2005) A new synonym and new Thailand records of Cincticostella femorata (Tshernova) (Ephemeroptera: Ephemerellidae). Proceedings of the Entomological Society of Washington, 107 (3), 733–734.
Kang, S.C. & Yang, C.T. (1995) Ephemerellidae of Taiwan (Insecta, Ephemeroptera). Bulletin of National Museum of Natural Science, 5, 95–116.
Kapur, A.P., & Kripalani, M.B. 1961. The mayflies (Ephemeroptera) from the northwestern Himalaya. Records of the Indian Museum, 59, 183–221.
Kluge, N.J. (1998) Phylogeny and higher classification of Ephemeroptera. Zoosystematica Rossica, 7(2), 255–269.
Kluge, N.J. (2004) The Phylogenetic System of Ephemeroptera. Kluwer Academic Publishers, Dordrecht. 442pp.
Ogden, T.H., Osborne, J.T., Jacobus, L.M., Whiting, M.F. (2009) Combined molecular and morphological phylogeny of Ephemerellinae (Ephemeroptera: Ephemerellidae),with remarks about classification. Zootaxa, 1991, 28–42.
Quan, Y.T., Bae, Y.J., Jung, J.C. & Lee J.W. (2002) Ephemeroptera (Insecta) fauna of Northeast China. Insecta Koreana, 19 (3, 4), 241–269.
Riek, E. F. (1973) The classification of the Ephemeroptera. In: Peters, W. L. & Peters, J. G. Proceedings of the first international conference on Ephemeroptera. E.J. Brill Leiden, The Netherlands, pp. 160–178.
Tshernova, O.A. (1972) Some new Asiatic species of mayflies (Ephemeroptera, Heptageniidae, Ephemerellidae). Entomologicheskoe Obozrenie, 51, 604–614 (in Russian).
Tshernova, O.A. (1952) Mayflies of the Amur River Basin and nearby waters and their role in the nutrition of Amur fishes. Proceedings of the Amur Ichthyology Expendition of 1945–1949, 3, 229–360 (in Russian).
Uéno M. (1928) Some Japanese mayfly nymphs. Memoirs of the College of Science, Kyoto Imperial University, Series B, 4 (1), 19–63.
Ulmer, G. (1929) Über einige, hauptsächlich asiatische, Ephemeropteren und Trichopteren aus der Sammlung R. McLachlan. Deutsche Entomologiche Zeitschrift, 3, 161–195.
Ulmer, G. (1935–1936) Neue chinesische Ephemeropteren, nebst ubersicht uber die bischer aus China bekannten Arten. Peking Natural History Bulletin, 10, 201–215.
Yu, L. (1998) A key on nymphs of new record species and subspecies of family Ephemerellidae (Ephemeroptera) from Changbai Mountain in China. Acta Entomologica Sinica, 41 (3), 435–437 (in Chinese).