CLADOENDESIS OF EPHEMEROPTERA

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Characters of Metreplecton of unclear phylogenetic status.

(1) Larval abdominal terga and sterna lack spine-like setae (the same in Metretopus/fg2, unlike Siphloplecton).

(2) Tergalii IV–VII have denticles on costal margin [armed with rib – see Metretopus/fg1 (3)]; the same in Metretopus/fg2, unlike Siphloplecton.

(3) Distal segment of labial palp [2^nd+3^rd – see Metretopus/fg1 (2)] is widest near apex (Kluge 2004: Fig.22:H) (the same in Siphloplecton, probably synapomorphy).

(4) Cubital field of fore wing usually with 1 intercalary (Kluge 2004: Fig.22:A), selected specimens can have up to 3 intercalaries [see Metretopus/fg1 (5)].