CLADOENDESIS OF EPHEMEROPTERA
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Fig. 219–227. Centroptella (Centroptella) illiesi. 219–220 – larval abdomen; 221 – subimaginal hind leg; 222 – larval abdominal segments IX–X; 223 – abdominal sternum IX of male larva with subimaginal gonostyli starting to develop; 224 – larval abdominal tergum IX; 225–226 – tergum X; 227 – larval cercus.