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 Acerpenna.

(1) Tergalius VII is crescent-shaped: anal rib [situated on anal margin – see Tetramerotarsata (12)] is shortened, and anal margin of tergalius goes nearly straight from apex of the vestige of anal rib to apex of costal rib, thus forming a point. The same in some Nigrobaetis/g3 – digitatus [Baetis] and acinaciger [B.].

Characters of Acerpenna of unclear phylogenetic status. 

() In mature larva ready to moult to subimago, buds of subimaginal gonostyli are folded under larval cuticle by the "Labiobaetis-type" [see Baetofemorata (2)]: 2^nd and 3^rd segments of gonostylus are directed medially and somewhat arched by convexity posteriorly, thus margin of 2^nd segment represents the posteriormost part of the bud (Fig. ??). The same in some other taxa (see Index of characters [2.3.9]).

() On anterior margin of hind wing [see Turbanoculata (10)] distally from costal projection is present a gentle convexity covered with small spines. The same in Camelobaetidius/g1?

Plesiomorphies of Acerpenna.

...