Thraulodes nigripes, 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 : 107-114

publication ID 10.11646/zootaxa.4756.1.1

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Thraulodes nigripes

sp. n.

15. Thraulodes nigripes sp. n.

( Figs 479–509 View FIGURES 479–490 View FIGURES 491–497 View FIGURES 498–507 View FIGURES 508–509 )

Etymology. Allusion to uniformly dark brown, nearly black color of all legs of imago.

Material examined. Holotype: L/S ♂ {slide 14.V.2006 -1}, PERU, Reg. Huanuco, Aquaytia, Pampa Yurac (9°04’S, 75°57’W), 21–24.II.2006, coll. N. Kluge. GoogleMaps Paratypes: the same locality and collector, 25.II.2006: 1 L-S-I ♀, 18 larvae. GoogleMaps


Larva. CUTICULAR COLORATION ( Figs 479–486 View FIGURES 479–490 ). Dorsal side of head, thorax and abdomen mostly brown with few blanks: pronotum bordered by light laterally; abdominal terga with blanks on lateral parts, area mediad of tergalii attachments nearly unicolor brown. Femora mostly brown, with blanks; tibiae and tarsi uniformly brown.

HYPODERMAL COLORATION. In last instar larva, tibiae more or less darkened with brown or blackish, darker than femora (this coloration at first appears on fore leg, than on other legs). In larvae of various instars, abdomen with more or less expressed transverse brown or gray stripes on posterior margins of all or some terga.

SHAPE AND SETATION. Clypeus parallel-sided; labrum 1.2–1.4 times wider than clypeus ( Figs 481, 485 View FIGURES 479–490 ). Labrum widest at 0.4 length from base; initial fore margin (turned ventrally) without median emargination, with all 5 denticles wide; anterior transverse setal row regular (as in Fig. 88 View FIGURES 86–93 ), as wide as all 5 denticles. Maxilla with 16–17 pectinate setae in apical-ventral row.

Femora: Stout setae on anterior surface narrowed distally or parallel-sided, apically truncated ( Fig. 487 View FIGURES 479–490 ). Irregular row of hairs near inner margin absent on fore femur, present on middle and hind femora.

Fore tibia ( Fig. 488 View FIGURES 479–490 ): outer hairs form two 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 dense (i.e. setae longer than distances between them), consists of pointed bipectinate and smooth setae, situated irregularly (about 2–3 setae in cross section).

Hind tibia ( Figs 489–490 View FIGURES 479–490 ): outer-anterior row of stout setae consists of two clearly different types of stout setae: numerous shorter blunt ones and several long spoon-like ones; outer-posterior row of stout setae consists of blunt stout setae of various lengths; hairs located between these rows, numerous and form more than one row (besides row of hairs posteriad of outer-posterior row of stout setae); stout setae of inner-anterior row moderately long, parallelsided and truncated.

Claws with 6–7 denticles on rigid portion, with or without minute denticles on articulatory portion.

Tergalii ( Figs 503–506 View FIGURES 498–507 ): moderately wide; on both lamellae main trachea with branches directed toward costal and anal margins; dorsal lamella with costal margin most convex in proximal part and anal margin most convex in distal part, gradually narrowed toward apex, with slender apical filament; ventral lamella widest near base, gradually narrowed toward apex, with slender apical filament.

Male genitalia in last larval instar ( Fig. 498 View FIGURES 498–507 ): protogonostyli long and separated one from another by deep emargination. Each protopenis lobe apically wide, with gonopore-bearing process sharply projected caudally and located near median margin; gonopore opened caudally-laterally.

Subimago. CUTICULAR COLORATION. Cuticle mostly light ocher, nearly colorless. Flagellum of antenna darker, light brown. Mesonotum partly brown, with dark brown antelateroparapsidal suture, colorless area on posterior scutal protuberance and colorless achromozones; medioscutal chromozone somewhat darker than submedioscutal chromozone ( Fig. 497 View FIGURES 491–497 ). Thoracic pleura with some sclerites light brownish. On all legs femur mostly light ocher, bordered by darker brown on outer and inner margins and apically; tibia and tarsus light brown. Cuticle of wings colorless, microtrichia brown. Abdominal terga very light brownish, sterna 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. Unknown. Based on male subimago extracted from mature larva, following imaginal features can be reported.

Head brown. Antenna with scapus and flagellum ocher, pedicellus dark brown. Dorsal eyes contiguous medially, grayish.

Legs of all pairs with femur and tibia uniformly dark brown; tarsus of fore leg with each segment proximally dark brown, distally ocher; tarsus of middle and hind legs light brownish.

Abdominal hypodermal coloration ( Fig. 495 View FIGURES 491–497 ): Terga with posterior margins narrowly bordered by grayishbrown; tergum I mostly brown; terga II–VI mostly ocher, each with pair of small, diffusive, transverse reddish-andbrown marks laterally; terga VII–X medially reddish-brown, laterally whitish; tergum VIII with pair of longitudinal lateral brown stripes, laterally narrowly bordered by brown; tergum IX with pair of smaller longitudinal lateral brown stripes. Abdominal sterna ocher with grayish nerve ganglia; sternum VIII with pair of longitudinal reddish stripes and brown maculae anteriad and posteriad of them; sternum IX tinged with reddish antero-laterally. Caudalii in proximal part dark brown with each 4th segment lighter, in middle part with alternated darker and lighter brown segments; all joinings darker brown.

Genitalia ( Figs 496 View FIGURES 491–497 , 499–501 View FIGURES 498–507 ). Long segments of gonostyli (initial 1st+2nd segments) with intensive dark brown hypodermal coloration, both apical segments without it. Dorsal extension of styliger very long, parallelsided, truncated apically. Telopenes in form of spear-like rolls, long and straight; judging by projection laterad of spear-like roll ( Fig. 501 View FIGURES 498–507 ), imaginal penis with well-developed ears.

Female imago ( Figs 493–494 View FIGURES 491–497 ). Head brown. Antenna with scapus and flagellum ocher, pedicellus dark brown. Pronotum brown with darker and lighter areas, propleura and prosternum ocher with brown. Mesonotum light brown; mesothoracic pleural sclerites, basisternum, furcasternal median impression and furcasternal protuberances brown, other areas ocher. Metathorax brown with ocher.

Legs of all pairs with femur and tibia uniformly dark brown, tarsus light brownish. In specimen reared from larva, relation of fore, middle and hind femora to fore wing length 70:67:85:310; proportions femur/tibia/tarsomeres on fore leg 70:77:2:7:6:5:9; on middle leg 67:72:2:3:3:2:8; on hind leg 85:82:2:3:3:2:8.

Fore wing with longitudinal and cross veins ocher-brownish; costal brace and adjacent parts of C and Sc dark brown. Costal cross veins proximad of bulla few, light ocher-brownish and very thin, so that visible only under high magnification (as in Fig. 142 View FIGURES 133–142 ). Pterostigmatic cross veins dense, oblique, non-branched. Hind wing with costal projection prominent; proximal part of hind wing brown ( Fig. 507 View FIGURES 498–507 ).

Abdominal terga dorsally light brown, laterally with ocher; sterna mostly ocher; uromere VII with posterior part of sternum dark brown; uromere VIII with lateral parts of tergum and sternum brown; uromere IX with lateral parts of tergum and posterior part of sternum brown.

Eggs ( Figs 508–509 View FIGURES 508–509 ). Mostly barrel-shaped. Each KTC surrounded by ring-like cover with smooth surface; in some areas of egg ring-like covers smoothed out, being indistinguishable from surrounding surface. Other chorion rugose, nearly without protuberances.

Dimension. Fore wing length (and approximate body length) 7.5 mm.

Comparison. Besides the new species Th. nigripes sp. n., femora and tibiae of all legs in imaginal and subimaginal stages are uniformly dark brown only in Th. niger sp. n. and Th. nigrabdominalis sp. n. Male Th. nigripes sp. n. differs from both of them by the longer and wider dorsal extension of styliger ( Fig. 499 View FIGURES 498–507 ); this difference is expressed beginning from the early stage of development in last-instar larva—compare Fig. 502 View FIGURES 498–507 and Fig. 477 View FIGURES 474–478 . Besides this, male of Th. nigripes sp. n. differs from Th. niger sp. n. and Th. nigrabdominalis sp. n. by the contrastingly different coloration of abdominal terga II–VI and VII–X ( Fig. 495 View FIGURES 491–497 ). Male and female imagines and subimagines of Th. nigripes sp. n. also differ from Th. niger sp. n. by presence of dark macula close to costal brace and by absence of coloration in costal and subcostal fields of fore wing ( Fig. 493 View FIGURES 491–497 ). Larva of Th. nigripes sp. n. differ both from Th. niger sp. n. and Th. nigrabdominalis sp. n. by uniformly brown coloration of abdominal terga.