CLADOENDESIS OF EPHEMEROPTERA
Nesameletus/f1=Metamonius/g1 - Siphluriscus)
Nomen hierarchicum: Siphluriscus/fg(1) [f:2003; g:1920]
In circumscription fits:
— gen. Siphluriscus Ulmer (1919)1920:1–80: 61
— fam. Siphluriscidae Zhou & Peters 2003:345
— Siphluriscus/fg(1): Kluge 2004: 109
References. Ulmer (1919)1920:1–80: ; – Demoulin 1955h: ; – McCafferty & Wang 1994b: ; – Zhou & Peters 2003: ; – Kluge 2004: .
Autapomorphies of Siphluriscus.
(1) Branched filamentous gills are present on bases of mouthparts and leg: maxilla, besides lateral gill [see Nesameletus/f1=Metamonius/g1 (7)], has another multibranched gill directed medially; labium bears a pair of multibranched gills by sides of submentum; in larva, subimago and imago bases of fore and middle (but not hind) legs bear multibranched gills, which arise from inner-proximal margin of coxa (Zhou & Peters 2003: Fig.8,10,16,29). Similar, but differently arranged gills independently appeared in some other taxa (see Index of characters ).
(2) Larval claw bears an unusually large flexible projection on inner side (Zhou & Peters 2003: Fig.32). Unlike Nesameletus/f2=Metamonius/g2, denticles are absent.
Characters of Siphluriscus of unclear phylogenetic status.
(3) Larval paraproct with a spine on inner-apical margin (Zhou & Peters 2003: Fig.21). The same in Siphlonurus/fg2, Metretopus/fg1 and Vetulata.
Plesiomorphies of Siphluriscus. In larva (unlike Nesameletus/f2=Metamonius/g2): Mandibles [see Nesameletus/f1=Metamonius/g1 (1)] are not elongate perpendicular to axis of articulation (Zhou & Peters 2003: Fig.6-7). 1st dentiseta is not thickened, common base of 2nd and 3rd dentisetae is either stout and bears a few irregular non-fused setae (Kluge 2004: Fig.31:E) or non-expressed (Zhou & Peters 2003: Fig.6-7). Tergalii without additional rib on anal margin. Subimaginal lateral pigmented area of mesonotum is not large, bifurcates posteriorly in such a manner, that one its branch stretches along lateroparapsidal suture, and another branch – along lateral scutal suture (plesiomorphic condition, unlike Nesameletus/f2=Metamonius/g2 and many others – see Index of characters [2.2.14]).
Size. Fore wing length 17–25 mm.
Nominal species in Siphluriscus/fg(1): 1 species
chinensis Ulmer 1920 [Siphluriscus] ,(Entomol.Inst.Czech.AS)