Thraulodes alboniger

Kluge, Nikita J., 2020, Systematic position of Thraulodes Ulmer 1920 (Ephemeroptera: Leptophlebiidae) and descriptions of new and little-known species, Zootaxa 4756 (1), pp. 1-142 : 120

Group alboniger

Definition. Larva of the single species placed here, differs from all other Thraulodes by wider anterior transverse setal row on labrum ( Fig. 563 ) and opposite bent of tergalii ( Figs 585–588 ). Imago differs from all other Thraulodes by very compact black preapical band on hind femur ( Figs 574, 575 ).

Composition. One species, Th. alboniger sp. n. is described here. Variability of imaginal coloration ( Figs 574, 575 ) allows to assume that the type series consists of more than one species. To verify this, it is necessary to rear from larvae imagines of the light form ( Figs 571, 573, 574 ).

Figures

FIGURES 563–568. Thraulodes alboniger sp. n. 563, labrum; 564–565 and 566–567, male imaginal genitalia of two different specimens; 568, fragment of imaginal caudalius (563, 566–568, holotype).Abbreviations: anter.r., anterior transverse setal row; poster.r., posterior transverse setal row; other arrow show six sensilla separating five denticles.

FIGURES 578–588. Thraulodes alboniger sp. n. 578, hind wing; 579, genitalia of male imago in ventral view; 580, dorsal margin of styliger and penis of another specimen; 581, subimaginal exuviae of genitalia; 582, penis in lateral view; 583, posterior margin of IX sternum of female larva; 584, the same of male larva with protogonostyli and protopenis; 585–588, tergalii I, III, VI and VII (578, 580–581, 584–588, holotype).

FIGURES 569–577. Thraulodes alboniger sp. n. 569, female subimago extracted from larva; 570, apex of fore wing; 571–573, abdominal terga of three different male imagines; 574–575, two male imagines in lateral view; 576, head and thorax of male imago in dorsal view; 577, right half of subimaginal exuviae of mesonotum (570, 572, 577, holotype).