CLADOENDESIS OF EPHEMEROPTERA
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Figs 19–27. Anafroptilum orthostylus, exuviae of larval abdomen. 19 – median part of tergum IV; 20–23 – posterior margin of terga V, VI, VII and IX; 24–26 – posterior margin of sterna V, VIII and sternum IX of female; 27 – sternum IX of male with protogonostyli (20–22, 27 – holotype). Arrow shows paired submedian pore near posterior margin of tergum IX; abbreviations: sV–sIX – sterna V–IX; tIV–tIX – terga IV–IX.