CLADOENDESIS OF EPHEMEROPTERA

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Autapomorphy of Cincticostella/g2.

(1) The most ventral maxillary canine [basally separated by a deep impression – see Cincticostella/g1 (1)] is not projected medially, but widened and flattened in such a manner that projects apically; its ventral margin is denticulate (sometimes translucent and poorly visible on background of apical setae); two other maxillary canines are diminished (Kluge 2004: Fig.92:H) or lost. Unique apomorphy. Generally, maxilla is specialized as filtering: apical margin is more or less widened, the apical setal field is enlarged, with setae long (Kang & Yang 1995: Fig.3C,4E). Similar filtering specialization of maxillae independently appeared in Torleya/g1-Uracanthella, but without such widening of ventral canine and without impression at its base (Kluge 2004: Fig.93:B,D).