Nonnullidens fuyugensis, 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.15923224
persistent identifier	https://treatment.plazi.org/id/B6062997-E0F3-5C1A-8C13-19CB3E686F78
treatment provided by	ZooKeys by Pensoft
scientific name	Nonnullidens fuyugensis
status	sp. nov.

Treatment

Nonnullidens fuyugensis sp. nov.

Figs 34 C View Figure 34 , 35 B View Figure 35 , 45 View Figure 45 , 46 View Figure 46 , 64 C, D View Figure 64

Material examined.

Holotype. • Papua New Guinea, one nymph on slide, Central Province, Woitape , 1700 m, I.2008, 08°31.290'S, 147°13.684'E, Posman col [PNG 166], GBIFCH 01223141 ( ZSM) GoogleMaps . Paratypes. • Papua New Guinea, one nymph on slide GBIFCH 01223142 , 4 nymphs in ethanol, GBIFCH 01523464 , same data as holotype ( MZL) GoogleMaps .

Nymph.

Body length, female: 4.5–5.0 mm.

Diagnosis.

Femora uniformly dark brown, without transverse bands; gill I uni-lamellate, without ventral lamella; gills II – VI with four or five filaments on dorsal lamella and two filaments on ventral lamella, gill VII with three or four filaments on dorsal lamella and a single one on ventral lamella.

Colouration.

Head. Vertex greyish brown, with characteristic yellowish maculae posteriorly, pale brown between lateral ocelli and eyes, frons medium brown with a middle pale brown oval macula. Antenna broken. Mouth parts pale brown. Thorax. Pronotum medium brown, greyish brown laterally and antero-medially. Mesonotum pale brown, washed with greyish brown laterally (Fig. 35 B View Figure 35 ). Femur greyish brown, whitish at base. Tibia yellowish to pale brown. Tarsi greyish brown. Abdomen. Terga dark brown, with a paler sagittal line increasing in width on segments VIII – X. Sterna yellowish brown to greyish brown. Gills greyish purple. Terminal filaments yellowish.

Description.

Head. Labrum cordiform (Fig. 45 A View Figure 45 ). Ratio labrum width / clypeus width 1.04–1.10. Ratio labrum width / insertion width 1.45–1.53. Medial emargination shallow with flat denticles. Proximal row of setae present, simple. Number of setae on proximal row ~ 36–37. Distal row of setae present, simple. Median part of labrum in ventral view with scattered thin setae (Fig. 45 B View Figure 45 ). Mandibles. Outer margin with row of setae on distal 1 / 2. Ending of the row near incisor. Right mandible with 7–9 setae below the mola (Fig. 45 C View Figure 45 ). Maxillae. Posterior margin of cardo with few hair-like and some stout setae (Fig. 34 C View Figure 34 ). Proximo-lateral margin of stipes with a bunch of six stout medium size and long setae. Apical-ventral row with 23–27 pectinate setae. Maxillary palp segment II 0.79–0.80 as long as segment I. Maxillary palp segment III 0.79–0.80 as long as segment I (Fig. 45 D View Figure 45 ). Stout setae on outer margin of segment I absent. Segment II inner margin with three or four stout setae. Segment II outer margin without stout setae. Segment III inner margin with five stout setae, dorsal surface with few setae at apex. Segment III 1.69–2.10 × as long as base width. Labium. Labial palp segment II 0.84–0.86 as long as segment I. Labial palp segment III 0.81–0.84 as long as segment I (Fig. 45 E View Figure 45 ). Segment I inner margin with 11–14 stout setae, outer margin with 14 stout setae. Segment II outer margin with four or five stout setae. Segment III dorsal face with three or four stout setae. Segment III 3.20–3.40 × as long as base width. Hypopharynx. Apex of superlingua truncate (Fig. 45 F View Figure 45 ).

Thorax. Dorsal margin of femur with a row of long, stout, pointed setae; a regular submarginal row of pointed setae as long as or a little bit shorter than those on the dorsal margin, shorter on hind femur; ventral margin with short, stout setae and an irregular submarginal row of long, pointed stout setae; central area of upper surface with numerous long and short, stout, pointed setae (Fig. 46 A View Figure 46 ). Fore tibia with several rows of long simple or feathered setae on ventral margin, dorsal margin with numerous hair-like setae; middle tibia with a row of short, simple, pointed setae on ventral margin and a submarginal row of long, simple setae, dorsal margin with numerous hair-like setae; hind tibia with two rows of simple and feathered long, stout setae on ventral margin, dorsal margin with short and long pointed stout setae and numerous hair-like setae. Tarsal claw slightly hooked with four or five denticles progressively larger apically (Fig. 46 B View Figure 46 ).

Abdomen. Gill I with single lamella. Gills II – VII with dorsal and ventral lamellae, ventral lamella smaller. Gill I uni-lamellate with three or four filaments (Fig. 46 D View Figure 46 ), gills II – VI with four or five filaments on dorsal lamella and two filaments on ventral lamella (Fig. 46 E View Figure 46 ), gill VII with three or four filaments on dorsal lamella and a single one on ventral lamella (Fig. 46 F View Figure 46 ). Posterior margin of terga IX with minute denticles (Fig. 46 C View Figure 46 ). Posterior margin of terga V – VIII without denticles. Posterolateral projections present on segments VIII – IX.

Eggs. General shape rounded. Size 130 μm × 80 μm. Chorionic surface smooth without visible attachment structures (Fig. 64 C View Figure 64 ). Micropyle in equatorial position (Fig. 64 D View Figure 64 ).

Derivatio nominis.

The specific name honours the tribes of the Fuyug (Fuyughe) people, who live where the new species has been found.