Thraulodes ludmilae, Kluge, Nikita J., 2020

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: 22-26

publication ID 10.11646/zootaxa.4756.1.1

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Thraulodes ludmilae

sp. n.

1. Thraulodes ludmilae   sp. n.

( Figs 5–41 View FIGURES 5–13 View FIGURES 14–20 View FIGURES 21–24 View FIGURES 25–34 View FIGURES 35–41 )

Etymology. The species in named in honor of Ludmila Sheyko, who collected the single larva and paid attention to its unusual appearance.

Material examined. Holotype: L-S-I ♂ {specimen [XI](10)2018}, PANAMA, Provincia Bocas del Toro, Bosque protector Palo Seco, Altos del Valle , Rio Buris (8°47’37’’N, 82°11’35’’W), 26.I.2018, coll. L. Sheyko & N. Kluge. GoogleMaps   Paratype: the same locality and collectors, 24–29.I.2018: 1 S-I ♂. GoogleMaps  


Larva (single specimen examined). CUTICULAR COLORATION ( Figs 5–10 View FIGURES 5–13 ). Head and thorax with very contrastingly alternated large dark (i.e. dark brown) areas and large light (i.e. ocher or nearly colorless) areas. Labrum dark; clypeus, anterior part of frons and mandibles light; posterior part of head dark. Pronotum entirely light; mesonotum dark, with medioposterior part (corresponding to imaginal scutellum) light; fore protoptera dark with convex and concave longitudinal veins lighter. Thoracic pleura with sclerites dark; sterna light. Legs mostly light, femora with darker markings. Each abdominal tergum II–IX with anterior part dark, posterior part light, terga IV–V medially also light; abdominal sterna light, sternum IX darker.

HYPODERMAL COLORATION. Unknown; probably, abdominal terga with paired blackish spots corresponding to midway gray spots of imago (as in Fig. 68 View FIGURES 66–69 ). Tergalii brownish, tracheae black ( Fig. 11 View FIGURES 5–13 ).

SHAPE AND SETATION. Clypeus parallel-sided; labrum 1.3 times wider than clypeus ( Fig. 6 View FIGURES 5–13 ). Labrum widest at midlength; initial fore margin (turned ventrally) without median emargination, with all 5 denticles wide; anterior transverse setal row regular, as wide as 3 denticles (as in Fig. 88 View FIGURES 86–93 ). Maxilla with 13 pectinate setae in apical-ventral row.

Femora: Stout setae on anterior surface parallel-sided and blunt ( Fig. 13 View FIGURES 5–13 ). Irregular row of hairs near inner margin absent on fore and middle femora, very sparse on hind femur.

Fore tibia ( Fig. 21 View FIGURES 21–24 ): outer hairs form two separated irregular rows; inner-anterior row of recurved hairs absent; inner-anterior row of stout setae represented by few (2–3) blunt stout setae near tibia base; inner field of stout pointed setae moderately dense (setae lengths subequal to distances between them), its setae subequal in lengths, forming 2 rows, setae of anterior row partly dentate, setae of posterior row smooth.

Hind tibia ( Fig. 24 View FIGURES 21–24 ): each of three rows of stout setae—outer-anterior, outer-posterior and inner-anterior onesconsists of blunt stout setae of various lengths; hairs located between outer-anterior and outer-posterior rows, form one irregular row (besides row of hairs posteriad of outer-posterior row of stout setae).

Claws with 6–7 denticles on rigid portion, with several minute denticles on articulatory portion.

Tergalii ( Fig. 11 View FIGURES 5–13 ): each lamella slender, tracheae without visible side branches.

Male genitalia in last larval instar ( Fig. 37 View FIGURES 35–41 ): protogonostyli separated one from another by narrow and deep emargination. Each protopenis lobe very short, apically rounded, without gonopore-bearing process; gonopore opened caudally-laterally.

Subimago (31, 34, 36, 39). CUTICULAR COLORATION. Cuticle mostly colorless. Flagellum of antenna brownish. Mesonotum with antelateroparapsidal and lateroparapsidal sutures contrastingly colored with dark brown, posterior part of chromozone and some other areas shed with light brownish ( Fig. 34 View FIGURES 25–34 ). On all legs tibia and tarsus light brownish ( Fig. 31 View FIGURES 25–34 ). Cuticle of wings colorless, microtrichia light brownish. Caudalii light brownish. Other cuticle of body, legs and gonostyli colorless.

TEXTURE. On tarsi of all legs, 1st tarsomere with microtrichia (as tibia), 2nd–5th tarsomeres coved by blunt microlepides; pointed microlepides present near apical margins of 2nd–4th tarsomeres of middle and hind legs (as in Fig. 473 View FIGURES 464–473 ).

Male imago ( Figs 25–30, 32–33 View FIGURES 25–34 , 35, 38, 40, 41 View FIGURES 35–41 ). Head ocher with brown. Antenna with scapus ocher, pedicellus reddish-brown, flagellum ocher. Dorsal eyes contiguous medially, dull orange.

Prothorax ocher with pair of dark brown spots above coxa. Meso- and metanotum light brown. Lateral sides of pterothorax ocher with brown. Ventral side of pterothorax mostly ocher, with transverse pale orange band crossing anterior part of mesothoracic episterna and basisternum.

Cuticle of legs mostly colorless; on fore leg base of tibia with cuticle brown. Legs with following hypodermal pigmentation on whitish background: Fore femur with small orange spot on anterior side at 1/4 from base and multicolored apical band, occupying distal 0.4 of femur; apical band mainly orange, apically darker, proximally bordered by blackish-brown, on inner side with blackish-brown longitudinal stripe. Fore tibia with orange-brown apex. Middle and hind femora with multicolored pre-apical band within apical 1/3 of femur; pre-apical band mainly orange, proximally bordered by blackish-brown. In holotype, relation of fore femur to fore wing length 55:275; proportions femur/tibia/tarsomeres on fore leg 55:86:2:25:29:11:7; on middle leg 54:67:3:4:3:2:6; on hind leg 65:70:3:4:3:2:6.

Fore and hind wings with dark brown macula on costal brace and bases of Sc and R; longitudinal and cross veins colorless. Costal cross veins proximad of bulla few, colorless and very thin, visible only under high magnification ( Fig. 32 View FIGURES 25–34 ). Pterostigmatic cross veins not dense, perpendicular to longitudinal veins or slightly oblique, nonbranched. Hind wing with prominent costal projection ( Fig. 41 View FIGURES 35–41 ).

Abdominal hypodermal coloration: Abdominal tergum I brown. Terga II–VI whitish, translucent, with more or less expressed brown band on posterior margin; terga IV–V or IV–VI with pair of small gray midway spots; tergum IV with poorly expressed median transverse spots; tracheae and stigmata not colored. Tergum VII orange, tergum VIII anteriorly-medially orange and posteriorly-laterally white, terga XI–X orange. Sternum I brown due to hypodermal and cuticular pigmentation ( Fig. 27 View FIGURES 25–34 ); sterna II–VI whitish, translucent; sternum VII whitish with brown ganglion; sterna VIII–IX whitish, laterally with orange. Caudalii mostly white, with black dot on each joining; larger and smaller dots alternated.

Genitalia ( Figs 33 View FIGURES 25–34 , 35–40 View FIGURES 35–41 ): Styliger, gonostyli and penis light ocher. Dorsal extension of styliger finger-like, denticulate, well separated from styliger margin and inserted dorsad of styliger. Penis lobes unusually small and simple, rounded apically, with ventro-median ridges expressed only at very base. Basal lobes (containing seminal pump) not separated from remainder penis. Telopenes very short, delicate, sharply bent ventrally-proximally, with groove shallow, widely opened and exposed ventrally-laterally.

Female and eggs. Unknown.

Dimension. Fore wing length (and approximate body length) 6–6.5 mm.

Comparison. Thraulodes ludmilae   sp. n. is related to Th. sinuosus   . Male imago of Th. ludmilae   sp. n. differs from Th. sinuosus   by separated dorsal extension of styliger, extremely shortened spears of penis, presence of orange spot on in proximal part of fore femur and colored apex of fore tibia. Larva of Th. ludmilae   sp. n. differs from Th. sinuosus   by cuticular coloration with clypeus, pronotum and posterior parts of abdominal terga contrastingly lighter than other areas (individual variability of larvae is not examined). In last instar, male larva of Th. ludmilae   sp. n. differs from Th. sinuosus   by narrower emargination between protogonostyli and by shorter protopenis.