CLADOENDESIS OF EPHEMEROPTERA
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CLADOENDESIS OF EPHEMEROPTERA |
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Eatonigenia/g1
(Panephemeroptera
Euephemeroptera
Euplectoptera
Anteritorna
Bidentiseta
Furcatergaliae
Fimbriatotergaliae
Fossoriae
Ephemera/fg9
Hexagenia/fg1
Eatonica/g1
- Eatonigenia)
Nomen hierarchicum:
Eatonigenia/g1
[g:1939]
In circumscription fits:
— gen. Eatonigenia Ulmer 1939: 477
— gen. Heterogenesia Dang 1967: 159
— Eatonigenia/g1: Kluge 2004: 242
Nominal taxon included:
Heterogenesia/g
[g:1967]
References. Ulmer 1939: 
; –
Dang 1967: 
; – McCafferty 1973: *
*; – Zhang 1988: ; – Kluge
2004: * 
* *
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Autapomorphies of Eatonigenia. (1) On larval fore leg [burrowing – see Fossoriae (1)] claw is vestigial, completely dipped into an incision on apex of tibia (McCafferty 1973: Fig.23–24). Unique apomorphy. (2) Penis lobes are fused all along their length and have a characteristic shape – trapezoid, widened apically, with gonopores located on a pair of small ventral projections in proximal-median part (McCafferty 1973: Fig.9–12). Character of Eatonigenia of unclear phylogenetic status. (3) Imaginal and subimaginal gonostylus with 1 distal segment only (instead of two initial ones). Non-unique apomorphy (see Index of characters [2.3.12]); among Ephemera/fg9 the same in Eatonica/g2 (possibly synapomorphy) and Pseudeatonica. Plesiomorphy of Eatonigenia. Vestige of tergalius I [see Ephemera/fg9 (4)] is bilamellate (unlike Litobrancha). |
Size. Fore wing length 10–17 mm.
Distribution. Oriental Region.
Nominal species in Eatonigenia/g1:
chaperi Navás 1935 [Hexagenia]
— typus nominis Eatonigenia
chinei
Dang 1967 [Heterogenesia]
— typus nominis Heterogenesia
indica Chopra 1924 [Hexagenia]
philippina Navás 1933 [Hexagenia]
seca McCafferty
1973 [Eatonigenia]
trirama McCafferty 1973 [Eatonigenia]
zhangi
Sun & Luo & Zhou 2016 [Eatonigenia] 
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