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 Baetisca/f2=g1.

(1) Prosternum has a bispinate projection between leg bases; this projection is prominent in imago and subimago (Staniczek & Bechly 2002: Fig.8), but indistinct in larva.

(2) Hind wing is nearly round (Kluge 2004: Fig.17:C). 

(3) Imaginal and subimaginal paracercus is vestigial, non-segmented (Pescador & Peters 1974: Fig.24D; Staniczek & Bechly 2002: Fig.10). Non-unique apomorphy (see Index of characters [2.3.22]). 

Plesiomorphies of Baetisca/f2=g1 (unlike Prosopistoma/f1=g2).

In larva (known for Baetisca/f3=g2 only): Mouth apparatus is non-specialized: labrum is not widened; mandible has normal form, with mola and prostheca; superlinguae are present; maxilla [see Posteritorna (7)] has 3 canines and 6-8 dentisetae (Kluge 2004: Fig.17:G-H) (number of dentisetae varies individually); anterior-lateral lobes of submentum [see Posteritorna (7)] are not large, situated dorsad of the rest part of labium and do not cover it; glossae and paraglossae are separated one from another (Eaton 1883-1888: Pl.52:5-10; Pescador & Berner 1981: Fig.5a-f). 

In imago and subimago: Fore wing has complete venation, including all branches and intercalaries of RS (with RSa₂ arising from RSa), symmetrical bifurcation of MA near middle of wing with intercalary iMA, crossveins and intercalaries; hind wing with bifurcation of MP near middle of wing and with crossveins; costal projection is situated at a distance from base (Kluge 2004: Fig.17:B-C). Legs are functional; tarsus is 5-segmented, 1^st tarsal segment is fused with tibia, longer than 2^nd; claws are ephemeropteroid [except for male fore legs - see Baetisca/f3=g2 (5) below]. Moult to subimago takes place in both sexes. At least in Baetisca/f3=g2 eyes of male are large, indistinctly separated to two portions; mesonotal suture is distinct, transverse, stretches backward medially (Kluge 2004: Fig.17:D-E).