The imaginal morphology of the species Kangella brocha (Kang and Yang, 1995) from southern China (Ephemeroptera: Ephemerellidae)

Kangella brocha (Kang & Yang, 1995), a mayfly species known on nymphs only, has been previously placed in three different genera. Here, their first -found adults and additional nymphs from southern China reveal some new characteristics. Apart from its elongated mouthparts, extended outer incisors, widened prothorax, and shortened caudal filaments in the nymph stage, the adult exhibits a robust thorax, straight forceps, and large penes with dorsal projections. These distinct features, observed in both immature and alate stages, provide compelling evidence that this species deserves an independent genus. Therefore, the genus Kangella Sartori, 2004 is reinstated, and this species is reclassified under it. Functionally, the outstanding outer incisor likely serves purposes such as digging or capturing prey. Our finding not only narrows the distribution gap between two populations of this species but also enriches the diversity of ephemerellids in terms of ecological adaptations.