CLADOENDESIS OF EPHEMEROPTERA |
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Stenonema/fg2
(Panephemeroptera
Euephemeroptera
Euplectoptera
Anteritorna
Bidentiseta
Branchitergaliae
Heptagennota
Pentamerotarsata
Radulapalpata
Heptagenia/f5=g4Ecdyonurus/fg1Heptagenia/f6=g5KageroniaHeptagenia/f7=g6
Stenonema/fg1
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Stenonema/fg2)
Nomen hierarchicum: Stenonema/fg2 [f:2004; g:1933] (sine Stenacron, Macdunnoa)
In circumscription fits:
— subgen. Stenonema: Kluge 1983b: 16 (unpublished)
— gen. Stenonema: Jensen 1974: 225
— Stenonema/fg2: Kluge 2004: 174
References. Edmunds & Jensen & Berner 1976: * *; – Lewis 1978a: *; – Bednarik & McCafferty 1979: * *; – Kluge 2004: * * * *.
Character of Stenonema/fg2 of unclear phylogenetic status. (1) Tergalii I–VI are not pointed (unlike Stenacron), apically obliquely truncate or rounded, with anal margin the longest [that is connected with development of anal rib – see Stenonema/fg1 (2)] (Edmunds & al. 1976: Fig.126–127). Plesiomorphies of Stenonema/fg2. Unlike Macdunnoa, tergalii VII [thin and lacking fibrillose portion – see Stenonema/fg1 (3)] are not shortened. Variable characters of Stenonema/fg2. In selected species of Stenonema/fg2 on maxilla the apical-ventral row of pectinate setae [see Radulapalpata (3)] is vestigial; this character was erroneously regarded as an apomorphy of the whole taxon Stenonema/fg2; actually in some species up to 9 normally developed pectinate setae can be present (Bednarik & McCafferty 1979: 6). |
Size. Fore wing length 6–16 mm.
Distribution. North and Central America (dominate in Eastern Nearctic).
The taxon Stenonema/fg2 is divided into: |