(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna Bidentiseta Furcatergaliae  
Fimbriatotergaliae Fossoriae Cryptoprosternata Palingenia/f2=g1
PentageniaPalingenia/f3=g2 Anagenesia/g1 - Cheirogenesia)

Nomen hierarchicum: Cheirogenesia/g(1) [g:1952]

In circumscription fits:

gen. Cheirogenesia Demoulin 1952a: 10

gen. Fontainica McCafferty 1968: 293

Cheirogenesia/g(1): Kluge 2004: 256

Synonym: subjective synonym of Cheirogenesia/g (typus decaryi [Anagenesia]) is Fontainica/g [g:1968] (typus josettae [F.]) (subjective synonymy: decaryi [A.] = josettae [F.])

References. Demoulin 1952a: ; 1965b: ; Fontaine 1968 ["Ephemeridae (larve)" & "Cheirogenesia sp."]: ; McCafferty 1968 (Fontainica): ; McCafferty & Edmunds 1976b: ; Sartori & Elouard 1999: ; Kluge 2004:

Autapomorphy of Cheirogenesia.

(1) On fore wing [see Anagenesia/g1 (1)] MP1 and iMP are brought together [besides the vein pairs situated anteriad of them see Palingenia/f3=g2 (2)]. This character is especially well expressed in male, where distance between apices of MP1 and iMP is as small as between apices of previous geminating veins (RSa2+iRS, RSp+MA1, iMA+MA2) (Demoulin 1952a: Fig.4); in female distance between MP1 and iMP can be larger. Non-unique apomorphy: the same type of gemination is present in Behningia/fg3.

Character of Cheirogenesia of unclear phylogenetic status (Table).

(2) Cubital field of fore wing [see Anteritorna (1)] includes a strong convex vein "CuA2" arising from CuA to basitornal margin and looking as a branch of CuA; a single intercalary "iCuA" is situated between "CuA2" and the distal part of CuA (Demoulin 1952a: Fig.4). Non-unique apomorphy (see Index of characters [2.2.51]); among Anagenesia/g1 the same in Anagenesia/g2 and Plethogenesia; probably synapomorphy.

Plesiomorphies of Cheirogenesia (Table). At least in male imago all legs with 2 claws [blunt see Anagenesia/g1 (2)]. In larva: on outer margin of mandibular tusk each denticle terminates by a spine-like seta [see Palingenia/f2=g1 (2)] (McCafferty & Edmunds 1976: Fig.4); outer margin of fore tibia without denticles, with spine-like setae [see Palingenia/f2=g1 (5)] (Fontaine 1968: Pl.V-VI).

Size. Fore wing length 18 mm. 

Distribution. Madagascar.

Nominal species in Cheirogenesia/g(1): 

 decaryi Navás 1926 [Anagenesia] typus nominis Cheirogenesia

 edmundsi Sartori & Elouard 1999 [Cheirogenesia]

 josettae McCafferty 1968 [Fontainica] syn.subj. decaryi [Anagenesia]

 laurencae Sartori & Elouard 1999 [Cheirogenesia]