CLADOENDESIS OF EPHEMEROPTERA

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Autapomorphies of Mayobaetis.

() Larva is adopted to climb out of the water onto a rock and jump back to the water: legs are relatively shorter, thicker and stronger than in other baetids, that allows larva to crawl by a wet rock (while legs retain possibility to stretch back and press to the body when larva swims); abdomen is relatively larger and stronger than in other baetids, that allows larva to jump from a wet rock.

() On larval antenna pedicellus is attached to a distal-lateral angle of scapus, so scapus has a free projected distal-median angle, which bears stout protuberances; similar protuberances on median side of pedicellus.

() Larval crercus with one large lateral spine-like seta near posterior margin of each segment.

Characters of Mayobaetis of unclear phylogenetic status. 

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

() Larval claw [see Baetungulata (1)] bears a large seta on posterior-inner side (see Index of characters [1.2.24]).

() Larval abdominal terga with scales in operculate sockets [see Turbanoculata (12)] (see Index of characters [1.3.4]).

Plesiomorphies of Mayobaetis.

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 developed.