CLADOENDESIS OF EPHEMEROPTERA
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Fig. 641–663. Hubbardula heterolepida, right tergalii with ventral lamella bent left. 641 – tergalius III of last instar larva (in Canadian balsam, to show natural coloration); 642–648 – tergalii I–VII of the same larva; 649 – tergalius III of holotype (dry, to show outline); 650–656 – tergalii I–VII of young larva with minimally developed protoptera (in falling light, to show natural coloration); 657–663 – the same in transmission light, to show outlines.