Thraulus (Masharikella) pascalae, 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.15923182
persistent identifier	https://treatment.plazi.org/id/061A328C-B70C-5699-B1B3-DE24EB9F867F
treatment provided by	ZooKeys by Pensoft
scientific name	Thraulus (Masharikella) pascalae
status	sp. nov.

Treatment

Thraulus (Masharikella) pascalae sp. nov.

Figs 24 C View Figure 24 , 29 View Figure 29 , 30 View Figure 30 , 34 G View Figure 34

Material examined.

Holotype • Indonesia, Papua, nymph on slide, Road Nabire – Enarotali KM 95 , 160 m, 22.X.2011, 03°34.193'S, 135°49.246'E, M. Balke col [PAP 13], GBIFCH 01223119 ( MZB) GoogleMaps . Paratypes. • Indonesia, Papua, one nymph on slide, GBIFCH 01223150 , 2 nymphs in ethanol, GBIFCH 01523482 , same data as holotype ( MZL) GoogleMaps .

Nymph.

Body length, male: 5 mm.

Diagnosis.

Apical ventral row of maxilla composed of 25–35 pectinate setae; outer margin of maxillary palp II with five stout setae; outer margin of labial palp segment II with five stout setae; tarsal claw with six or seven teeth progressively larger; posterior margin of abdominal segment IX with well-developed denticles; posterolateral projections of the abdomen present on segments VI – IX.

Colouration.

Head. Pale brown, medium brown between ocelli. Antenna whitish. Compound eye lower portion black, upper portion reddish brown. Mouth parts pale brown. Thorax. Pronotum medium brown. Mesonotum medium brown, parapsidal sutures dark brown. Metanotum medium brown. Femur yellowish, apex with an orange to pale brown dot. Tibia: fore- and middle tibiae yellowish, hind tibia orange to brown. Tarsi whitish. Abdomen. Terga medium brown, with a pale and narrow sagittal line, segment IX lighter with two dark maculae, segment X greyish brown (Fig. 24 C View Figure 24 ). Sterna pale brown, posterior margin of segments II to VIII medium brown. Gills with lamellae pale grey, filaments greyish purple. Terminal filaments yellowish, articulations of ~ 15 first segments tinted in brownish purple.

Description.

Head. Labrum cordiform (Fig. 29 A View Figure 29 ). Ratio labrum width / clypeus width 0.93. Ratio labrum width / insertion width 1.29. Medial emargination shallow with flat denticles. Proximal row of setae present, simple. Number of setae on proximal row ~ 31. Distal row of setae present, simple. Median part of labrum in ventral view with stout setae in row (Fig. 29 B View Figure 29 ). Mandibles. Outer margin with middle and distal tufts of setae. Ending of the row near incisor. Right mandible with ten setae below the mola (Fig. 29 C View Figure 29 ). Maxillae. Posterior margin of cardo with numerous hair-like setae and few stout setae, with a long and stout seta in submarginal position. Proximo-lateral margin of stipes with a single stout and long seta (Fig. 34 G View Figure 34 ). Apical-ventral row with 20 pectinate setae. Maxillary palp segment II 0.85 as long as segment I. Maxillary palp segment III 0.69 as long as segment I (Fig. 29 D View Figure 29 ). Stout setae on outer margin of segment I absent. Segment II inner margin with five stout setae. Segment II outer margin with five stout setae. Segment III inner margin with four stout setae, dorsal surface with few setae at apex. Segment III 1.73 × as long as base width. Labium. Labial palp segment II 0.84 as long as segment I. Labial palp segment III 0.74 as long as segment I (Fig. 29 E View Figure 29 ). Segment I inner margin with nine stout setae, outer margin with ten stout setae. Segment II outer margin with five stout setae. Segment III dorsal face with four stout setae. Segment III 3.11 × as long as base width. Hypopharynx. Apex of superlingua emarginated (Fig. 29 F View Figure 29 ).

Thorax. Dorsal margin of femur with a row of long, stout, pointed setae; submarginal row with setae of irregular length, row as long or half the length of dorsal margin; ventral margin with short, blunt, stout setae and a submarginal irregular row of simple setae (Fig. 30 A – B View Figure 30 ); central area of upper surface with few long, pointed setae. Fore tibia with three rows of numerous simple and feathered setae on ventral margin; outer margin of fore tibia with few hair-like setae; middle tibia with two rows of long, pointed setae on ventral margin, outer margin with numerous hair-like setae; hind tibia with a row of long, thin setae on ventral margin, with a sublateral row of simple and feathered setae, ventral surface covered with simple and feathered setae, outer margin with long, pointed stout setae. Tarsal claw hooked with six or seven denticles progressively larger apically (Fig. 30 C View Figure 30 ).

Abdomen. Gill I dorsal lamella narrow and lanceolate, ventral lamella shaped as other gills. Gills II – VII with dorsal and ventral lamellae of the same size. Gill II – VI with ~ 25 filaments on each lamella, gill VII with ~ 15 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 VI – IX.

Derivatio nominis.

This species is dedicated to Dr Pascale Derleth Sartori, wife of the first author.