CLADOENDESIS OF EPHEMEROPTERA
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Plesiomorphon Amercaenis

(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna Bidentiseta Furcatergaliae  
Fimbriatotergaliae Caenotergaliae Caenoptera Caenis/f3=g1MadecocercusCaenis/f4=g2TillyardocercusCaenis/f5=g3  
Clypeocaenis/fg1 - pm.Amercaenis)

Nomen hierarchicum: Amercaenis/g(1) [g:1985]

In circumscription fits:

— gen. Amercaenis Provonsha & McCafferty 1985: 2

— plesiomorphon Amercaenis/g(1): Kluge 2004: 289

References. Provonsha & McCafferty 1985: ; – Kluge 2004:

Plesiomorphies of Amercaenis. Maxillary palp is 3-segmented (unlike Clypeocaenis/g2). Filtering setae on fore tibia and tarsus [see Clypeocaenis/g1 (1)] are situated only on inner side (unlike Clypeocaenis/g2), not forming rows (unlike Clypeocaenis/g3).

Size. Fore wing length 2–4 mm. 

Distribution. Nearctic.

Nominal species in Amercaenis/g(1):  

cusabo Provonsha & McCafferty 2006 [Amercaenis]

ridens McDunnough 1931 [Caenis] — typus nominis Amercaenis ,

See also: 

Caenis/f4=g2 INCERTAE SEDIS

Caenoptera INCERTAE SEDIS

Furcatergaliae INCERTAE SEDIS