CLADOENDESIS OF EPHEMEROPTERA

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Autapomorphies of Jubabaetis/g1.

(1) Flat projections, forming a row on mola of left mandible, are very small and petiolate; they begin at a distance from the distal molar projection, so that several small pointed denticles locate between them and the distal molar projection (Kluge & Novikova 2011: Fig.136, 154, 168, 193, 202). In other Acentrella/fg1 flat denticles, forming a row on mola of left mandible, are longer than 1/2 of the distal molar projection and begin close to it (ibid., Fig.102).

Characters of Jubabaetis/g1 of unclear phylogenetic status. 

(2) Fore tarsus of female imago and subimago has 2 apical spines: 2^nd and 3^rd tarsomeres are spine-bearing; 4^th tarsomere (penultimate, with stretched apical-ventral angle) lacks apical-ventral spine. Initially, tarsus of middle and hind leg of both sexes retains 3 apical spines, i.e. 4^th tarsomere is spine-bearing, as in the plesiomorphon Acentrella/fg2 [see Acentrella/fg1 (10)]; this occurs in Tanzaniops, Jubabaetis/g3 and plesiomorphon Liebebiella. In Platybaetis tarsus of middle and hind leg of both sexes has only 2 apical spines (Kluge & Novikova 2011: Fig.185), as on fore leg of female [see below, Platybaetis (4)] (see Index of characters [2.2.78.2], [2.2.83]).

(3) Hind wings are always absent [see Acentrella/fg1 (7)].

(4) Larval frons, being projected above clypeus [see Acentrella/fg1 (2)], can bear peculiar setae, which are very dense, short, fine, colorless and curved dorsally-backward. In Jubabaetis/g3 these setae are enlarged [see below, Jubabaetis/g3 (2)]. In Tanzaniops and some species of the plesiomorphon Liebebiella (e.g., verum [Procloeon], bispinosa [Acentrella] and cylindroculata [Acentrella]) these setae are smaller and poorly visible (Kluge & Novikova 2011: Fig.124). In some other species of Liebebiella (e.g., proximum [Pseudocloeon] and undescribed species from Philippines) these setae are absent. In Platybaetis frons is not projected above clypeus and these setae are absent.