CLADOENDESIS OF EPHEMEROPTERA

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(1) On fore wing CuP in its proximal part is connected with CuA by a constant crossvein cua-cup, and with AA – by a constant crossvein cup-aa; cua-cup is located more distally than cup-aa; CuP arises from CuA under acute angle (plesiomorphic condition) and is sharply bent at the place of connection with cua-cup (Chen & Zheng 2023: Fig. 3B). The same in Ephemerella/fg1 [see Ephemerella/fg1 (6)].

(2) On hind wing MA is not forked (Chen & Zheng 2023: Fig. 3B); the same in all Furcatergaliae and some others (see Index of characters [2.2.67]).

(3) Imaginal and subimaginal claws (initially ephemeropteroid) on each leg are similar and pointed  (Chen & Zheng 2023: Fig. 2D-E). Non-unique apomorphy (see Index of characters [2.2.85]).

Plesiomorphies of Siphlonephemerella.

(4)  Imaginal and subimaginal tarsi are 5-segmented, 1^st segment is the longest, fused with tibia  (Chen & Zheng 2023: Fig. 2C-G) [n contrast to all Furcatergaliae, including Ephemerella/fg1, whose 1st tarsomere is shortened – see Furcatergaliae (2)].