CLADOENDESIS OF EPHEMEROPTERA

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Dacnogenia

(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna Bidentiseta Branchitergaliae
Heptagennota Pentamerotarsata Radulapalpata 
Heptagenia/f5=g4
Ecdyonurus/fg1Heptagenia/f6=g5KageroniaHeptagenia/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] --/

gallica Eaton 1885 [Heptagenia] — syn.subj. coerulans [Heptagenia

 micracantha Kluge 1989 [Heptagenia (Dacnogenia) coerulans --/


See also:

Radulapalpata INCERTAE SEDIS

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