FIGURES 450–463 in Systematic position of Thraulodes Ulmer 1920 (Ephemeroptera: Leptophlebiidae) and descriptions of new and little-known species

FIGURES 450–463. Larvae, presumably attributed to Thraulodes nigrabdominalis sp. n. 450–455, parts of last instar larva at the same magnification: 450, fragment of head with labrum and mandibles; 451, pronotum and mesonotum; 452, hind leg; 453, abdominal terga; 454–455, tergalii IV–V; 456–458, exuviae of young larva at the same magnification: 456–457, fore and hind legs; 458, abdominal terga and sterna; 459, young larva with brown cuticular coloration and blackish hypodermal coloration; 460, larval protogonostyli and protopenis; 461, anterior side of hind femur; 462, hind tibia with focus on outer-posterior row of stout setae; 463, the same with focus on outer-anterior and inner-anterior rows of stout setae.