FIGURES 31–40. Tortopus arenales. 31 in A cladistic revision of Tor top us Needham & Murphy with description of the new genus Tortopsis (Ephemeroptera: Polymitarcyidae)

FIGURES 31–40. Tortopus arenales. 31, male head, d.v.; 32, male abdominal terga VI–VII; 33, male abdominal sterna VII–VIII; 34, male mesofurcasternal plates; 35, female abdominal sternum VIII; 36, male genitalia, v.v.; 37, same, l.v.; 38, penes after treatment with potash; 39–40, detail of apex of forceps.