Thraulodes, Ulmer, 1920

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 : 134-136

publication ID 10.11646/zootaxa.4756.1.1

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20. Thraulodes sp. «Itaya»

( Figs 637–653 View FIGURES 637–649 View FIGURES 650–653 )

Material examined. PERU, Rio Itaya, upstream Puente Itaya (57 km by road from Iquitos ), near Omaguas , 1– 15.11.2006 (N. Kluge): 3 incomplete larval exuviae (last instar male, last instar female and young female).


Larva. CUTICULAR COLORATION ( Figs 638–645 View FIGURES 637–649 ). Dorsal side of head brown. Pronotum and mesonotum brown with diffusive blanks; fore protopteron with veins darker than background. Femur light brown with diffusive blanks; tibia with 2 wide brown bands (proximal and middle); tarsus colorless.Abdominal terga without contrasting markings, posterior terga gradually darker than anterior ones. Abdominal sterna lighter, posterior sterna with brown arched macula.

HYPODERMAL COLORATION. Coloration of body unknown. Tergalii dark gray ( Fig. 637 View FIGURES 637–649 ).

SHAPE AND SETATION. Clypeus slightly widened anteriorly; labrum 1.2 times wider than clypeus ( Fig. 650 View FIGURES 650–653 ). Labrum widest at midlength, with narrow median emargination exposed ventrally; anterior transverse setal row wider than all 5 denticles, in its median part represents field of irregularly situated setae ( Figs 651–653 View FIGURES 650–653 ). Maxilla with 12–14 pectinate setae in apical-ventral row.

Femora: Stout setae on anterior surface narrowed apically and truncate ( Fig. 646 View FIGURES 637–649 ). Row of hairs near inner margin absent on fore and middle femora, sparse on hind femur.

Fore tibia ( Fig. 647 View FIGURES 637–649 ): outer hairs form two irregular rows; inner-anterior row of recurved hairs absent; inneranterior row of stout setae represented by few (2–3) stout blunt setae in proximal part of tibia; inner field of stout pointed setae consists of pointed smooth setae, situated irregularly, 1–2 setae in cross section.

Hind tibia ( Figs 648–649 View FIGURES 637–649 ): outer-anterior and outer-posterior rows of stout setae consist of blunt stout setae of various lengths and long spoon-like stout setae; posterior hairs located between these rows form more than one row (besides row of hairs posteriad of outer-posterior row of stout setae); stout setae of inner-anterior row elongate, arched, narrowed distally and blunt.

Claws with 4–5 denticles on rigid portion, often without denticles on articulatory portion.

Tergalii ( Fig. 637 View FIGURES 637–649 ): wide, but with few side trachea; dorsal lamella oval, widest in distal part, apically abruptly turned to slender apical filament; ventral lamella widest near base, gradually narrowed toward apex, with slender apical filament, with main trachea arched repeating outline of anal margin.

Subimago, imago, eggs. Unknown.

Discussion. By cuticular coloration of larval femora and structure of tergalii this species resembles Th. alboniger sp. n., but clearly differs from Th. alboniger by structure of labrum and absence of contrasting blanks on abdominal terga.