CLADOENDESIS OF EPHEMEROPTERA
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Tetramerotarsata Liberevenata Turbanoculata
Anteropatellata - Baetopus/g1)
Nomen hierarchicum: Baetopus/g1 [g:1960] (incl Raptobaetopus)
In circumscription fits:
— gen. Baetopus: Kazlauskas 1962: 41
References. Kazlauskas 1962: '; – Keffermuller 1967: ' '; – 1984: '; – Kluge & Novikova 1992: *; ...?
Autapomorphies of Baetopus/g1.
(1) Labial palp is 2-segmented, 2nd+3rd segment thickened, without muscle inside. In contrast to majority of other Tetramerotarsata, whose boundary between 2nd and 3rd segments and muscle-retractor of 3rd segment are retained.
Characters of Baetopus/g1 of unclear phylogenetic status.
() Maxillary palp is 2-segmented. Non-unique apomorphy; the same in selected groups of Cloeon/fg1, et al. (see Index of characters [1.1.42]).
() Tergalii are either unable to rhythmical respiratory movements (see Index of characters [1.3.30]), or make movements of peculiar type (in Raptobaetopus/g1 .
() Imaginal and subimaginal medial longitudinal suture of mesonotum is convex, forming a longitudinal ridge. Probably, plesiomorphy in limits of Liberevenata, as the same in Palaeocloeon, Centroptilum/g1, ...?
() ?? penial arms?? (see Index of charcaters [2.3.16a])
Plesiomorphies of Baetopus/g1.
Lateral sides of larval abdomen without spines, caudalii without dark rings on each 4th joining (unlike Cloeon/fg1).
In mature larva which is ready to molt to subimago, buds of subimaginal gonostyli are folded under larval cuticle by the "Cloeon-type": 2nd segment of gonostylus is directed laterally, and third segment is curved caudally and medially [see Turbanoculata (13)] (unlike Baetovectata – see Index of characters [2.3.9]).
Size. Fore wing length 3–5 mm (see Tetramerotarsata).
Distribution. Holarctic and Oriental Regions.
|The taxon Baetopus/fg1 is divided into:|
1. plesiomorphon Baetopus/g2
2. Raptobaetopus/g1 (incl. Cymbalcloeon)