Thraulus (Thraulus) timorensis, Sartori & Salles, 2025

Sartori, Michel & Salles, Frederico F., 2025, The Leptophlebiidae of New Guinea (Ephemeroptera, Choroterpinae, Thraulini), ZooKeys 1245, pp. 41-175 : 41-175

publication ID	https://doi.org/10.3897/zookeys.1245.141723
publication LSID	lsid:zoobank.org:pub:7160C34D-C437-4469-9A47-91AB5B9DFB05
DOI	https://doi.org/10.5281/zenodo.15923151
persistent identifier	https://treatment.plazi.org/id/3AB9A5D3-50E4-55A3-9265-4BA483FF654D
treatment provided by	ZooKeys by Pensoft
scientific name	Thraulus (Thraulus) timorensis
status	sp. nov.

Treatment

Thraulus (Thraulus) timorensis sp. nov.

Figs 16 View Figure 16 , 17 View Figure 17 , 34 E View Figure 34

Material examined.

Holotype. • Indonesia, Timor, nymph on slide, GBIFCH 01223095 , some gills in ethanol, GBIFCH 01523478 , Naikliu area , restpools in dry forest, 130 m, 03.X.2011, 09°58.425'S, 123°41.439'E, M. Balke col [TIM 11] ( MZB). GoogleMaps

Nymph.

Body length, female: 6.5 mm.

Diagnosis.

Labrum cordiform, medial emargination shallow without denticles; dorsal face of labrum with multiple rows in distal position; tarsal claw hooked with 15 teeth and a palisade of four other teeth in distal position; gill lamellae on segments II – VI with> 25 filaments each; posterolateral projections of the abdomen present on segments VIII and IX.

Colouration.

Femur, tibia, and tarsi whitish.

Description.

Head. Labrum cordiform (Fig. 16 A View Figure 16 ). Ratio labrum width / clypeus width 0.95. Ratio labrum width / insertion width 1.39. Medial emargination shallow without denticles. Proximal row of setae present, simple. Number of setae on proximal row ~ 29. Distal row of setae multiple (Fig. 16 C View Figure 16 ). Median part of labrum in ventral view with stout setae in a row (Fig. 16 B View Figure 16 ). Mandibles. Outer margin with middle tuft of setae. Right mandible with ten setae below mola (Fig. 16 D View Figure 16 ). Maxillae. Posterior margin of cardo broken. Proximo-lateral margin of stipes with single long stout seta (Fig. 34 E View Figure 34 ). Apical-ventral row with 22 pectinate setae. Maxillary palp segment II 0.82 as long as segment I. Maxillary palp segment III 0.78 as long as segment I (Fig. 16 E View Figure 16 ). Stout setae on outer margin of segment I absent. Segment II inner margin with five stout setae, outer margin without stout setae. Segment III inner margin with five stout setae, dorsal surface with few setae at apex. Segment III 1.67 × as long as base width. Labium. Labial palp segment II 0.76 as long as segment I. Labial palp segment III 0.76 as long as segment I (Fig. 16 F View Figure 16 ). Segment I inner margin with two stout setae, outer margin with 12 stout setae. Segment II outer margin with ten stout setae. Segment III dorsal face with five stout setae. Segment III 2.90 × as long as base width. Hypopharynx. Apex of superlingua truncate (Fig. 16 F View Figure 16 ).

Thorax. Dorsal margin of femur with a row of long, stout and pointed setae; regular submarginal row with setae as long as those of dorsal margin (Fig. 17 A View Figure 17 ); ventral margin with short and pointed setae and a submarginal row of short and blunt but stout setae, except on hind leg where those on ventral margin are short and blunt (Fig. 17 B View Figure 17 ); central area of upper surface with few long pointed setae. Middle tibia with two rows of long pointed setae on ventral margin, outer margin with few hair-like setae; hind tibia with a row of long thin setae on ventral margin, upper and lower surfaces covered with simple and some feathered setae, outer margin with long and short pointed stout setae. Tarsal claw hooked with 15 denticles, together with a palisade of four small denticles at apex (Fig. 17 C View Figure 17 ).

Abdomen. Gill I with single bifid lamella. Gills II – VII with dorsal and ventral lamellae, dorsal lamella smaller. Gills II – VI with upper lamella entirely bordered with ~ 35 very long filaments, lower lamella with ~ 30 very long filaments (Fig. 17 D View Figure 17 ); gill VII smaller but with the same number of long filaments. Posterior margin of terga IX with denticles. Posterior margin of terga VIII with minute denticles. Posterior margin of terga V – VII without denticles. Posterolateral projections present on segments VIII – IX.

Derivatio nominis.

This species is named after the island from where it comes. Although we have a single nymph in hand, we think important to formally named it, since it possesses distinct characters; moreover, it is the first Leptophlebiidae described from this island and only the second mayfly species ( Kaltenbach and Gattolliat 2017).