CLADOENDESIS OF EPHEMEROPTERA
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CLADOENDESIS OF EPHEMEROPTERA |
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Acanthametropus/fg2
(Panephemeroptera
Euephemeroptera
Euplectoptera
Anteritorna
pm.Tridentiseta
Acanthametropus/fg1
- Acanthametropus/fg2)
Nomen hierarchicum:
Acanthametropus/fg2
[f:1963; g:1948]
(sine Analetris)
In circumscription fits:
— gen. Acanthametropus Tshernova 1948: 1453
— gen. Metreturus Burks 1953: 146
— subfam. Acanthametropodinae: Demoulin 1974: 3
— fam. Acanthametropodidae: McCafferty 1991a: 349
— Acanthametropus/fg2: Kluge 2004: 89
Nominal taxon included: Metreturus/g
[g:1953]
References. Tshernova 1948: 
;
– 1952:
;
– Burks 1953: ;
– Bajkova 1970 (Isonychia polita): 
;
– Edmunds & Jensen &
Berner 1976: ;
– Tshernova & Kluge & Sinitshenkova & Belov 1986:
;
– McCafferty 1991c: ;
– Kluge & Studemann & Landolt & Gonser
1995: 
;
– Kluge 2004:
.
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Autapomorphies of Acanthametropus/fg2. (1) Larval and imaginal head mediad of antennae bases has a pair of pointed projections (Kluge 2004: Fig.23:E); in larva they are much larger than in imago. (2) Maxillary palp is vestigial, 1-segmented. (3) Larval abdomen has unpaired dorsal and ventral projections (McCafferty 1991: Fig.1-2). (4) In each tergalius [3-lamellate – see Acanthametropus/fg1 (5)] both ventral (additional) lamellae and anal margin of dorsal lamella are dissected to numerous branched processes (Kluge 2004: Fig.23:A). (5) In imago and subimago (including male) caudalii [see Plesiomorphies of Acanthametropus/fg1] are relatively short, shorter than abdomen (unlike overwhelming majority of mayflies, which have caudalii of male imago strongly elongated). (6) In male imago and subimago on fore leg both claws are blunt (while on other legs they are ephemeropteroid – see Plesiomorphies of Acanthametropus/fg1). Non-unique apomorphy (see Index of characters [2.2.77]). Plesiomorphies of Acanthametropus/fg2. Unlike Analetris, gonostylus has 2 distal segments (Kluge 2004: Fig.23:G). |
Size. Fore wing length 14–20 mm.
Distribution. Amphipacific Sector of Holarctic: Eastern Palaearctic and Nearctic.
Nominal species in Acanthametropus/fg2:
nikolskyi Tshernova 1948 [Acanthametropus]
--/
pecatonica
Burks 1953 [Metreturus]
polita Bajkova 1970 [Isonychia]
— syn.subj.
nikolskyi [Acanthametropus]
See also:
Acanthameropus spp.
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