(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna pm.Tridentiseta
 Nesameletus/f1=Metamonius/g1 - Siphluriscus)

Nomen hierarchicum: Siphluriscus/fg(1) [f:2003; g:1920]

In circumscription fits:

gen. Siphluriscus Ulmer (1919)1920:180: 61

fam. Siphluriscidae Zhou & Peters 2003:345

Siphluriscus/fg(1): Kluge 2004: 109

References. Ulmer (1919)1920:180: ; 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 [1]).

(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 1725 mm.

Distribution. China.

Nominal species in Siphluriscus/fg(1): 1 species

 chinensis Ulmer 1920 [Siphluriscus] ,(Entomol.Inst.Czech.AS)