(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna Bidentiseta Furcatergaliae  
Leptophlebia/fg1 Atalophleboadentata Atalophlebopectinata Atalophleboculata Atalophlebomaxillata Atalophlebolinguata 
... Hagenulus/fg1 - Ulmeritus/g1)

Nomen hierarchicum: Ulmeritus/fg1 [f:202; g:1956] (incl. Ulmeritoides)

In circumscription fits:

— gen. Ulmeritus Traver 1959: 4;

— Ulmeritus-Ulmeritoides group: Dominguez 1995a: 34.

References. Traver 1959: ; – Dominguez 1991: * *; – 1995a: * *.

Autapomorphies of Ulmeritus/fg1.

(?) Gonostylus with proximal (1st+2nd) segment slender, arched; its basal 1/6 portion is sharply broadened, with projected inner-apical angle.

() Mouth apparatus ... 

Labrum ...

Outer margin of mandible, beside long sparse setae (usual for ...), with a field of shorter dense setae in distal part.

Labial palp with a row of thick setae from apex of 2nd segment to 3rd segment.

() Each tergalius I–VII has both lamellae [see Leptophlebia/fg1 (10)] wide, oval, with numerous long slender marginal processes; trachea branches from base. Non-unique apomorphy (see Index of characters [1.3.23]).

(?) Tergalii VII attached for from posterior margin of segment, nearer to middle or anterior margin

Characters of Ulmeritus/fg1 of unclear phylogenetic status. 


Plesiomorphies of Ulmeritus/fg1.

(P) All imaginal and subimaginal claws are ephemeropteroid.

Size. Fore wing length 8–12 mm.

Distribution. South America.

The taxon Ulmeritus/fg1 is divided into:

1. Ulmeritus/fg2 

2. Ulmeritoides

3. Diamantia