CLADOENDESIS OF EPHEMEROPTERA

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Autapomorphies of Andesiops/g1.

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Characters of Andesiops/g1 of unclear phylogenetic status. 

() Larval claw (which initially has 1 row of denticles – see Baetungulata (2)] has 2 rows of denticles. Non-unique apomorphy (see Index of characters [1.2.21]).

() Hind wing [see Turbanoculata (10)] of the "Nigrobaetis-type": not narrowed, with non-curved pointed costal projection, with three longitudinal veins among which the second is bifurcate (i.e. MA arises from RA). The same in Nigrobaetis/fg1 and some others (see Index of characters [2.2.60]).

() Larval antennae bases are not turned together, frons between them does not form a keel (see Index of characters [1.1.3]).

??() Larval tibia on latero-dorsal side with a regular longitudinal row of long setae. The same in Acentrella/g1; probably convergention connected with adaptation to rheophilous mode of life.

??() In larva, scales on abdominal terga [see Turbanoculata (12)] are lost (see Index of characters [1.3.4]). ??present in D. ardua!!

??() In imago and subimago anterior protuberance of mesonotum is prominent, pointed ...?

Plesiomorphies of Andesiops/g1.

In mature larva ready to moult to subimago, buds of subimaginal gonostyli are folded under larval cuticle by the "Nigrobaetis-type": 2^nd segment of gonostylus is directed posteriorly and curved by its convexity medially and by apex laterally [see Baetovectata (3)] (see Index of characters [2.3.9]).

Larval paracercus is either developed, or vestigial (see Index of characters [1.3.64])..