CLADOENDESIS OF EPHEMEROPTERA

A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z 

Autapomorphies of Oligoneurisca.

(1) Larval middle and hind legs [see Homoeoneuria/g1 (2)] are modifies: tibia is much shorter than tarsus and lacks setation; tarsus is very long, its long setae are directed proximally; claw has two rows of protuberances by sides (Kluge 2004: Fig.43:F).

Plesiomorphies of Oligoneurisca (unlike Homoeoneuria/g2). In imago: On fore wing double vein RSa+iRS is present; crossveins in area of pterostigma and between RA and RSa+iRS are present. Well-developed gonostyli with both distal segments are present. Penis without retractable processes, with medio-proximal condylus [see Geminovenata (6)].

In larva: Fore legs with a roundish vestige of claw (Kluge 2004: Fig.43:D-E). Abdominal sternum I has no finger-like process. All tergalii I–VII with developed lamellate and fibrillose lobes; lamellate lobes of tergalii II–VII are not narrowed (their width is more than 1/2 of length).