CLADOENDESIS OF EPHEMEROPTERA
Ephemerella/fg1 Pantricorythi - Austremerella)
Nomen hierarchicum: Austremerella/fg(1) [f:1997; g:1963]
In circumscription fits:
subgen. Austremerella: Allen 1965: 264
gen. Austremerella Riek 1963: 50
Austremerella/fg(1): Kluge 2004: 317
References. Riek 1963: ; Allen 1965: ; Riek 1970: ; Peters & Campbell 1991: ; McCafferty & Wang 1997: ; Kluge 2004: ; Suter & Mynott 2013:
Characters of Austremerella of unclear phylogenetic status.
(2) Tergalius VI has ventral lobe non-bifurcate, thus only tergalii IIV have bifurcate ventral lobes [see Ephemerella/fg1 (7)] (Kluge 2004: Fig.95:FH). The same structure of tergalius VI occurs in Ephemerella/fg4 only. Possibly, synapomorphy with Melanemerella/f1=Teloganodes/g1 and/or Tricoryptera, where ventral lobe of tergalius VI is vestigial or lost (see Table and Index of characters [1.3.57]).
(3) Tergalii VII [small, with non-bifurcate ventral lobes see Ephemerella/fg1 (7)] are strongly shifted anteriorly, being located at midlength of tergite (Kluge 2004: Fig.95:H) (unlike Vietnamella and Ephemerella/fg2, whose tergalii VII retain position close to posterior margin of tergite). In Tricoryptera and Melanemerella/f1=Teloganodes/g1 these tergalii are lost, thus their initial position is unknown.
(4) Fore wing with free marginal intercalaries (as in many other Ephemerella/fg1 see Index of characters [2.2.55]).
Plesiomorphies of Austremerella. Larval head, mandibles and fore legs without modifications peculiar for Vietnamella. Larval abdominal terga with paired submedian projections [see Ephemerella/fg1 (19)] (Riek 1963: Fig.1). Unlike Melanemerella/f1=Teloganodes/g1 and some others, tergalii II are not operculate. Cubital field of fore wing has up to 2 bifurcate veins arising from CuA [see Ephemerella/fg1 (15)]; hind wing is well-developed, as long as 0.2 of fore wing length, with Sc reaching wing apex, RS branching, and veins behind MP1 developed (Riek 1963: Fig.10) (unlike Teloganodes/f1=g3, Teloganella and Tricoryptera).
Size. Fore wing length 12 mm.
Distribution. Australia (this is the only representative of Ephemerella/fg1 in Australian Region).
Nominal species in Austremerella/g(1):
picta Riek 1963 [Austremerella]