CLADOENDESIS OF EPHEMEROPTERA |
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Dacnogenia
(Panephemeroptera
Euephemeroptera
Euplectoptera
Anteritorna
Bidentiseta
Branchitergaliae
Heptagennota
Pentamerotarsata
Radulapalpata
Heptagenia/f5=g4Ecdyonurus/fg1Heptagenia/f6=g5
KageroniaHeptagenia/f7=g6
- Dacnogenia)
Nomen hierarchicum:
Dacnogenia/g(1)
[g:1988]
In circumscription fits:
— subgen. Dacnogenia (manuscript name): Kluge 1983b:16
— subgen. Dacnogenia Kluge 1988: 297
— gen. Dacnogenia: Wang & McCafferty 2004: 44
— Dacnogenia/g(1): Kluge 2004: 172
References.
Eaton 1883–1888:
;
– Grandi 1953:
; –
1960:
;
– Landa 1969a:
;
– Kluge 1988:
; –
1989b:
;
– 1993:
; – 2004:
.
Autapomorphies of Dacnogenia. (1) Hypopharynx is strongly shortened, twice shorter than superlinguae (Kluge 2004: Fig.56:E). In other Radulapalpata and majority of mayflies length of hypopharynx is subequal to that of superlinguae. (2) Mouth apparatus is secondarily specialized as biting: mandibles are short and spout, maxillae are acute-angled with stout canines and dentisetae (Eaton 1883–1888: Pl.60:4–10). Non-unique apomorphy; among Radulapalpata the same in some Stenonema/fg1, Rhithrogena/fg3 and all Epeorus/fg3. Characters of Dacnogenia of unclear phylogenetic status. (3) Superlingua [curved laterally – see Heptagenia/f5=g4 (1)] with slightly concave lateral margin and angulate apex (Kluge 2004: Fig.56:E); by its form differs from any other taxon among Heptagenia/f5=g4. (4) In imago and subimago 1st tarsal segment is shortened, on fore tarsus of male several times shorter than 2nd segment. Non-unique apomorphy (see Index of characters [2.2.76]); among Pentamerotarsata the same in Heptagenia/f8=g7, Raptoheptagenia and selected species of Kageronia, Ecdyonurus/fg1, Rhithrogena/fg3. Plesiomorphies of Dacnogenia. Glossae are pyramidal [see Radulapalpata (1)], distal edge of glossa is not approximated to median edge (Kluge 2004: Fig.56:F-G) (unlike Heptagenia/f8=g7, Stenonema/fg1 and Ecdyonurus/fg1). All tergalii I–VII with fibrillose portion. |
Size. Fore wing length 10–13 mm.
Distribution. Western Palaearctic.
Nominal species in Dacnogenia/g(1):
coerulans Rostock 1878 [Heptagenia]
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/
gallica Eaton 1885 [Heptagenia]
— syn.subj. coerulans [Heptagenia]
micracantha Kluge 1989 [Heptagenia
(Dacnogenia) coerulans]
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/
See also:
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