CLADOENDESIS OF EPHEMEROPTERA
Ameletus/fg1 - Metreletus)
Nomen hierarchicum: Metreletus/g(1) [g:1951]
In circumscription fits:
— gen. Metreletus Demoulin 1951: 10
— Metreletus/g(1): Kluge 2004: 81
References. Demoulin 1951: ; – 1952c: ; – Ujhelyi 1960: ; – Studemann & Landolt & Tomka 1988: ; – Kluge 2004: ; – Kluge 2007: * * *.
Characters of Metreletus of unclear phylogenetic status.
(1) In cubital field of fore wing, veins, which go from CuA to wing margin [see Anteritorna (1)], are more or less substituted by one or two intercalaries (Demoulin 1951: Fig.1a-e,11a-d; 1952c: Fig.4; Ujhelyi 1960: Fig.5; Kluge 2007: Fig.4). Non-unique apomorphy (see Index of characters [2.2.52]).
(2) Larval claw on its inner side, besides irregular small denticles near base, has one row of greater denticles (Demoulin 1951: Fig.6b-d) (this character is known for balcanicus [M.] only, while leg structure of micus [A.] is unknown). The same in some Bidentiseta and others (see Index of characters [1.2.21]); probably non-unique autapomorphy.
(3) Imaginal penis has ventral plates [see Ameletus/fg1 (6)] very long and blunt (this is reliably known for balcanicus [Metretopus] only); on larval protopenis, each lobe has a prominent ventral plate separated by incision from lateral lobe (Kluge 2007: Fig.1-2) (unlike larval Ameletus, whose ventral plates are not separated from lateral lobes – Kluge 2007: Fig.10, Fig.21).
(4) Labrum has a deep apical incision (Kluge 2007: Fig.3) (unlike Ameletus, whose labrum has a shallow apical incision).
Plesiomorphy of Metreletus (unlike Ameletus/fg2). Glossae are not truncate, apically-ventrally with numerous irregular pointed setae (Kluge 2004: Fig.20:D) (this character is known for balcanicus [M.] only, while labium structure of micus [A.] is unknown).
Size. Fore wing length 7–14 mm.
Nominal species in Metreletus/g(1):
balcanicus Ulmer 1920 [Metretopus] ,,/
goetghebuergi Lestage 1938 [Metretopus] — typus nominis Metreletus — syn.subj. balcanicus [Metretopus]
hessei Fizaine 1931 [Ameletus] — syn.subj. balcanicus [Metretopus]
hungaricus Ujhelyi 1960 [Metreletus] — syn.subj. balcanicus [Metretopus]
micus Bajkova 1976 [Ameletus] /
omelkoi Tiunova 2012 [Metreletus]