CLADOENDESIS OF EPHEMEROPTERA
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Fig. 257–263. 257–262– Centroptella (Centroptella) sp. cf. quadrata: 257 – base of fore tibia, anterior view; 258 – base of middle tibia, anterior view; 259 – gonostyli extracted from mature larva; 260 – median projection of abdominal tergum X; 261–262 – egg. 263 – Centroptella (Centroptella) quadrata, middle tibia, anterior-outer view (based on photos provided by Xiaoli Tong).