CLADOENDESIS OF EPHEMEROPTERA
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Figure 41. Isonychia/fg2

A–B – Isonychia/fg2 crassiuscula [Isonychia]: A – tergalius V, dorsal view (ventral fibrillose lobe turned back); B – labium, dorsal view (in left half) and ventral view (in right half) (setation not shown, areas occupied by dense setae of glossae, paraglossae and palps shown by dotted lines; instead of setae of regular row on palp, their bases and area occupied are shown; muscles of glossae, paraglossae and palp shown by interrupted lines in right half) (compare with Figs 37:D and 44:B); C – Isonychia/fg2 ussurica [Isonychia], apex of left maxilla, dorsal view; D–E – Isonychia/fg2 ignota [Baetis]: D – larval head and prothorax, lateral view (fore leg removed); E – larval fore leg.

Abbreviations: a.r1 – anterior branch of anal rib; a.r2 – posterior branch of anal rib; c.r – costal rib; ds1 – vestige of distal dentiseta; ds2 – proximal dentiseta; gl – glossa; lbr – labrum; pgl – paraglossa; p.lb – labial palp; p.mx – maxillary palp.