Thraulus (Masharikella) johannisluci, 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.15923176
persistent identifier	https://treatment.plazi.org/id/A2A45575-0579-55AA-94A1-77CB092F8CAB
treatment provided by	ZooKeys by Pensoft
scientific name	Thraulus (Masharikella) johannisluci
status	sp. nov.

Treatment

Thraulus (Masharikella) johannisluci sp. nov.

Figs 27 View Figure 27 , 28 View Figure 28 , 34 F View Figure 34

Material examined.

Holotype. • Papua New Guinea, nymph on slide, Central Province, Kokoda Trek , 980 m, I.2008, 09°15.933'S, 147°36.590'E, Posman col [PNG 169], GBIFCH 01223118 ( ZSM) GoogleMaps . Paratype. • Papua New Guinea, 1 nymph in ethanol, GBIFCH 01523481 , same data as holotype ( MZL) GoogleMaps .

Nymph.

Body length, female: 4.5 mm.

Diagnosis.

Labrum width equal to clypeus width; proximal row of setae on dorsal face of labrum with> 35 setae; maxillary palp segment III <1.5 × as long as base width; tarsal claw with four teeth, distal one much larger than the others; posterior margin of abdominal segment VII – VIII without denticles; posterolateral projections of the abdomen present on segments VII – IX.

Colouration.

Head. Pale brown washed with grey, triangular yellowish area between front ocellus and clypeus. Mouth parts greyish brown. Thorax. Pronotum greyish brown, dark brown on lateral margins and along the sagittal line. Mesonotum pale brown washed with grey. Metanotum pale brown washed with grey. Femur upper surface greyish brown except apex yellowish, lower surface pale grey. Tibia yellowish brown, apex greyish. Tarsi yellowish to orange- brown. Abdomen. Terga more or less uniformly greyish brown, segments II – VII with a dark dot above the gill insertion, segments I – VIII with a paler sagittal line. Sterna yellowish grey in median part, segments I – VII greyish laterally, segment IX darker. Gills purplish grey. Terminal filaments uniformly pale brown.

Description.

Head. Labrum cordiform (Fig. 27 A View Figure 27 ). Ratio labrum width / clypeus width 1.00. Ratio labrum width / insertion width 1.40. Medial emargination shallow with flat denticles. Proximal row of setae present simple. Number of setae on proximal row 42. Distal row of setae present, simple. Median part of labrum in ventral view with only scattered stout setae (Fig. 27 B View Figure 27 ). Mandibles. Outer margin with row of setae on distal 1 / 2. Ending of the row near incisor. Right mandible with nine setae below the mola (Fig. 27 C View Figure 27 ). Maxillae. Posterior margin of cardo broken. Proximo-lateral margin of stipes with two long and two short stout setae (Fig. 34 F View Figure 34 ). Apical-ventral row with 24 pectinate setae. Maxillary palp segment II 0.81 as long as segment I. Maxillary palp segment III 0.80 as long as segment I (Fig. 27 D View Figure 27 ). Stout setae on outer margin of segment I absent. Segment II inner margin with two stout setae. Segment II outer margin without stout setae. Segment III inner margin with three stout setae, dorsal surface with few setae at apex. Segment III 1.45 × as long as base width. Labium. Labial palp segment II 0.69 as long as segment I. Labial palp segment III 0.88 as long as segment I (Fig. 27 E View Figure 27 ). Segment I inner margin with seven stout setae, outer margin with eight stout setae. Segment II outer margin with three stout setae. Segment III dorsal face with three stout setae. Segment III 3.0 × as long as base width. Hypopharynx. Apex of superlingua rounded (Fig. 27 F View Figure 27 ).

Thorax. Dorsal margin of femur with a row of long, stout, pointed setae; submarginal row with setae of irregular length, 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. 28 A View Figure 28 ); central area of upper surface with few stout, pointed setae. Fore tibia covered with numerous simple and feathered setae on ventral margin; outer margin of fore tibia without setae; mid- and hind tibia with a row of stout, pointed setae on ventral margin, outer margin without setae on mid tibia, with a sparse row of stout and pointed setae on hind tibia. Tarsal claw hooked with 4 denticles progressively larger, except distal much larger (Fig. 28 B View Figure 28 ).

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 I with ~ 20 filaments on the ventral lamella. Gill II – VI with 25–30 filaments on each lamella. Posterior margin of terga IX with denticles. Posterior margin of terga V – VIII without denticles. Posterolateral projections present on segment VII – IX.

Derivatio nominis.

This species is named after our colleague and friend Dr Jean-Luc Gattolliat (Naturéum, Lausanne), in recognition of his outstanding contributions to the Baetidae in general and to those of New Guinea in peculiar.