Teloganodes (Dudgeodes) rasus Kluge 2023, sp. n.
Creators: name: Kluge, Nikita
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Ephemeroptera
Teloganodidae
Teloganodes
Teloganodes rasus

description: Teloganodes (Dudgeodes) rasus sp. n.
(Figs 54–101)
Etymology: rasus (Lat.) —shaved; a hint that all stout setae on the larval head, body and legs are very short, as if the insect had been shaved.
Material examined. Holotype: L-S-IJ {specimen [XI](8)A2009}, INDONESIA, SULAWESI, tributary of river Mamasa 5 km W Mamasa, 23.VIII.2009, coll. N. Kluge & L. Sheyko. Paratypes: the same locality and collectors, 15–27.VIII.2009: 1 L-SJ, 4 larvae.
Descriptions
Larva. CUTICULAR COLORATION. Head, pronotum and mesonotum ochre with diffusive brown maculae (Figs 69–71). Femur of fore leg mostly ochre; femora of middle and hind legs mostly ochre, with proximal part diffusively darkened with brown; tibia of each leg diffusively darkened with brown in midlength-outer area (Figs 76–78). Abdominal terga with light brownish, with lateral areas of terga III– VI lighter (Fig. 72).
HYPODERMAL COLORATION. Head and thorax with brown maculae or mostly brown. Fore protoptera with brown macula at base. On each leg, femur with black-brown apex, tibia with black-brown base; middle and hind femora with or without dark longitudinal maculae on proximal part; tibia of each leg with or without dark longitudinal stripe near middle (Fig. 62). Abdominal terga I–II mostly brown, terga III– VI with variable brown marking; terga VII–IX mostly brown (Figs 61–62).
SHAPE AND SETATION. Labrum with simple setae forming transverse field all over labrum width, with feathered setae located distad of this field (as in Figs 6–7). Nearly all setae forming rows on lateral margins of head, pronotum, mesonotum, on femora and tibiae of legs, on posterior and lateral margins of abdominal terga, equally short and stout (Figs 70–72, 74–80, 82); only few setae longer: few setae on lateral parts of posterior margin of abdominal tergum I more or less elongate and bifid (Fig. 73); setae forming regular row on dorsal side of hind tibia along its inner margin, either all short and stout (as setae of other rows), or some of them long and thin (Fig. 81), or most of them long and thin. Outer side of each femur with two parallel rows of short, stout setae (Fig. 79). Each claw with row of 2–4 (usually 4) denticles on inner margin, without distal denticles, with 2 subapical longitudinal rows of arched setae (by one on anterior and posterior sides) (Fig. 83). Tergalii II–IV with two-branched ventral lobe, tergalius V without ventral lobe; dorsal lamella of each tergalius III–IV deeply cleft (Figs 54–57; tergalius V either without cleft (Figs 59–60), or with cleft much smaller than on previous tergalii (Figs 57–58).
Subimago. CUTICULAR COLORATION. Pronotum light brown. Mesonotum with anterior scutal chromozone and latero-posterior scutal chromozones light brown, medioparapsidal suture lighter; achromozone contrastingly colorless (Figs 98–99). Thoracic pleura and sterna with light brown and colorless areas. Wings brown. Fore femur with longitudinal dark brown and colorless bands; middle and hind femora colorless with light brown band along outer margin; fore tibia darker than tarsus, darkened with brown basally; middle and hind tibiae lighter, darkened with light brownish near base (Figs 89–90). Abdominal terga and sterna light brown, with contrasting colorless blanks (Fig. 85).
HYPODERMAL COLORATION. As in imago.
TEXTURE: On fore leg of male, 1st tarsomere (fused with tibia) covered with microtrichia (as tibia), 2nd–5th tarsomeres covered with blunt microlepides; on middle and hind legs 1st–4th tarsomeres covered with microtrichia (as tibia), 5th tarsomere covered with blunt microlepides.
Imago, male. Head brown. Dorsal eyes gray (Fig. 84). Thorax brown (Fig. 84). Fore wing with most membrane colorless, area proximad of costal brace brown; longitudinal veins colorless or ochre; cross veins colorless; crossveins of pterostigma simple (Figs 93–94). Hind wing widened distally, with costal projection in distal part; basal part of membrane and veins dark brown, other membrane and veins colorless (Figs 100–101). On foreleg, femur brown with apex black-brown; tibia mostly ochre, with black-brown base and apex; tarsus mostly ochre, with black-dark brown apex of each tarsomere II– V (Fig. 91). On middle and hind legs, femur mostly ochre with apex brown; tibia mostly ochre, with black-brown base and apex; tarsus mostly ochre, with black-brown apex (Fig. 92). Abdominal terga I–II mostly brown, terga III–IV mostly ochre with reddish, medially-anteriorly brown; terga V – VI mostly ochre with reddish; terga VII–IX mostly brown; sterna lighter (Fig. 86). Styliger light ochre-brownish, gonostyli and penis ochre (Fig. 97). Penis longer than 1st segment of gonostylus, widest near middle, with apices pressed together, with common unpaired gonopore exposed dorsally (Figs 95–96). Cerci ochre beginning from very base, with dark brown apex of each segment (Figs 87–88).
Imago, female. Unknown.
Egg. Unknown.
Dimension. Forewing length 7.5 mm.
Distribution. Sulawesi.
Comparison. Larva of the new species T. (D.) rasus sp. n. differs from all other species of Teloganodes s.l. by very short stout setae in all setal rows of femora and tibiae (Figs 75–82). Male imago of T. (D.) rasus sp. n. is similar to the sympatric species T. (D.) celebensis in wings and legs coloration, shape of hind wing and shape of penis; differs by coloration of abdomen, which in T. (D.) rasus sp. n. has terga III–VI lighter than terga VII–IX (Fig. 86), in contrast to uniformly dark terga I–X in T. (D.) celebensis (Fig. 32).
description: Published as part of Kluge, Nikita, 2023, Reclassification of Teloganodes Eaton 1882 (including subgenera Dudgeodes Sartori 2008 and Derlethina Sartori 2008) with a new species from Sulawesi (Ephemeroptera, Teloganodidae), pp. 527-552 in Zootaxa 5244 (6) on pages 542-551, DOI: 10.11646/zootaxa.5244.6.2, http://zenodo.org/record/7673035