Thraulus (Thraulus) eloisae, 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.15923113
persistent identifier	https://treatment.plazi.org/id/673A0BA7-DB47-5123-AC42-8D352F7DF545
treatment provided by	ZooKeys by Pensoft
scientific name	Thraulus (Thraulus) eloisae
status	sp. nov.

Treatment

Thraulus (Thraulus) eloisae sp. nov.

Figs 2 A View Figure 2 , 3 View Figure 3 , 4 View Figure 4 , 34 A View Figure 34

Material examined.

Holotype. • Papua New Guinea, nymph on slide, Eastern Highlands Province, Marawaka, Ande , 1700–1800 m, 09.XI.2006, 07°01.697'S, 145°49.807'E, M. Balke and Kinibel col [PNG 87], GBIFCH 01223087 ( ZSM) GoogleMaps . Paratypes. 3 nymphs in ethanol, GBIFCH 01523471 , 2 nymphs entirely mounted on slide, GBIFCH 01223090 , GBIFCH 01223089 , same data as holotype ( MZL) GoogleMaps . • Papua New Guinea, 1 nymph mounted on slide, GBIFCH 01223088 , Central Province, Woitape , 1500 m, I.2008, 08°33.178'S, 147°15.481'E, Posman col [PNG 167] ( MZL) GoogleMaps .

Nymph.

Body length, male: 6–6.5 mm; female: 7–7.5 mm.

Diagnosis.

Labrum rectangular, with emargination shallow; proximo-lateral margin of stipes with a single long and stout seta; maxillary palp greatly elongated; outer margin of maxillary palp segment II without stout setae; inner margin of labial palp segment I with 16–18 stout setae; apex of superlingua truncate. Gills II – VI completely fringed with filaments, with ~ 30 filaments on dorsal lamella and ~ 40 on ventral lamella; posterior margin of abdominal segment VIII without denticles; posterolateral projections of the abdomen present on segments VIII – IX.

Colouration.

Head yellowish, greyish between ocelli. Antenna yellowish. Compound eye lower portion black, upper portion brownish orange. Mouth parts pale brown. Thorax. Pronotum pale brown, with greyish areas laterally and medially as in Fig. 2 A View Figure 2 . Mesonotum greyish brown with scattered lighter maculae. Femur fore femur greyish, mid- and hind femur whitish, distal 1 / 3 washed with grey. Tibia yellowish orange, with apical macula greyish. Tarsi orange to yellow. Abdomen. Terga evenly greyish brown, lighter along the sagittal line. Sterna pale brown. Gills pale brown to greyish brown. Terminal filaments uniformly pale brown.

Description.

Head. Labrum rectangular (Fig. 3 A View Figure 3 ). Ratio labrum width / clypeus width 0.87–0.90. Ratio labrum width / insertion width 1.08–1.10. Medial emargination shallow with rounded denticles (Fig. 3 B View Figure 3 ). Proximal row of setae present, simple. Number of setae on proximal row ~ 75–100. Distal row of setae present, simple. Median part of labrum in ventral view with stout setae in row (Fig. 3 B View Figure 3 ). Mandibles. Outer margin with row of setae on distal 2 / 3. Ending of the row before incisor. Right mandible with 10 or 11 setae below the mola (Fig. 3 C View Figure 3 ). Maxillae. Posterior margin of cardo with few long hair-like setae, together with some long and stout setae (Fig. 34 A View Figure 34 ). Proximo-lateral margin of stipes with a single long and stout seta. Apical-ventral row with 15–18 pectinate setae. Maxillary palp 1.5 × longer than maxilla; maxillary palp segment II 1.17–1.39 × as long as segment I. Maxillary palp segment III 0.77–0.94 as long as segment I (Fig. 3 D View Figure 3 ). Few stout setae on outer margin of segment I. Segment II inner margin with one stout seta. Segment II outer margin without stout setae. Segment III inner margin with three or four stout setae, dorsal surface fully covered with setae, 2.57–2.64 × as long as base width. Labium. Labial palp segment II 0.59–0.71 as long as segment I. Labial palp segment III 0.64–0.71 as long as segment I (Fig. 3 E View Figure 3 ). Segment I inner margin with 16–18 stout setae, outer margin with 12–15 stout setae. Segment II outer margin with two or three stout setae. Segment III dorsal face with six or seven stout setae (Fig. 3 F View Figure 3 ), 2.00–2.43 × as long as base width. Hypopharynx apex of superlingua truncate.

Thorax. Dorsal margin of femur with a row of long, stout, pointed setae; submarginal row with setae as long as those of dorsal margin (Fig. 4 A View Figure 4 ); ventral margin with short, blunt, stout setae and a submarginal row of long, pointed, stout setae, except on hind leg where they are short and blunt (Fig. 4 B View Figure 4 ); central area of upper surface with few long pointed setae. Fore tibia with several rows of numerous simple feathered setae on ventral margin; outer margin with few hair-like 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 short and long, pointed, stout setae. Tarsal claw straight with 5–8 minutes denticles subequal in length (Fig. 4 C View Figure 4 ).

Abdomen. Gill I with single bifid lamella. Gills II to VII with dorsal and ventral lamellae, ventral lamella smaller. Gills II – VI with upper lamella lacking filaments on basal half of outer margin, with ~ 25–30 short filaments, lower lamella with ~ 35–40 short filaments (Fig. 4 E View Figure 4 ); on both lamellae apical filament much longer than the others; gill VII small, with narrow lamellae ending with a single filament (Fig. 4 F View Figure 4 ). Posterior margin of terga IX with denticles (Fig. 4 D View Figure 4 ). Posterior margin of terga V – VIII without denticles. Posterolateral projections present on segments VIII and IX.

Derivatio nominis.

This species is dedicated to Eloïse Sartori, daughter of the first author.