Nonnullidens boonsoongi, 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.15923214
persistent identifier	https://treatment.plazi.org/id/635CB6BF-9057-5845-9748-8555C7AF9BC6
treatment provided by	ZooKeys by Pensoft
scientific name	Nonnullidens boonsoongi
status	sp. nov.

Treatment

Nonnullidens boonsoongi sp. nov.

Figs 36 A View Figure 36 , 41 View Figure 41 , 42 View Figure 42

Material examined.

Holotype. • Papua New Guinea, one nymph on slide, Central Province, Kokoda Trek , 1400 m, I.2008, 09°01.952'S, 147°44.455'E, Posman col [PNG 172], GBIFCG 01223130 ( ZSM) GoogleMaps . Paratypes. two nymphs on slide, GBIFCH 01223131 , GBIFCH 01223132 , 10 nymphs in ethanol, GBIFCH 01523459 , same data as holotype ( MZL) GoogleMaps . Other material. • Papua New Guinea, one nymph on slide, GBIFCH 01223133 , gills and legs in ethanol, GBIFCH 01523460 , Western Highlands, Simbai area , 2500 m, 8.III.2007, 05°14.202'S, 144°33.651'E, Kinibel col [PNG 150] ( MZL) GoogleMaps .

Nymph.

Body length, male: 5 mm; female: 5.5 mm.

Diagnosis.

Femora uniformly dark brown, without transverse bands; tarsal claw with 6–8 teeth; gill I and II uni-lamellate, without ventral lamella; gills III – VI with five or six filaments on dorsal lamella and a single or two filaments on ventral lamella, gill VII with three filaments on dorsal lamella and a single filament on ventral lamella.

Colouration.

Head. Vertex dark 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. Compound eye upper portion reddish brown. Mouth parts pale brown. Thorax. Pronotum medium brown, dark brown laterally and anteromedially as in Fig. 36 A View Figure 36 . Mesonotum pale brown washed with dark brown. Femur greyish brown, whitish at base. Tibia yellowish, apex greyish brown on fore- and mid-tibia. Tarsi yellowish brown. Abdomen. Terga dark brown, paler along the sagittal line on segments VII – IX. Sterna pale brown, greyish brown in the middle, pale brown on each side of a sagittal line. Gills greyish brown. Terminal filaments yellowish.

Description.

Head. Labrum cordiform (Fig. 41 A View Figure 41 ). Ratio labrum width / clypeus width 0.99–1.04. Ratio labrum width / insertion width 1.36–1.45. Medial emargination shallow with flat denticles. Proximal row of setae present, simple. Number of setae on proximal row ~ 42–69. Distal row of setae present, simple. Median part of labrum in ventral view with scattered thin setae (Fig. 41 B View Figure 41 ). Mandibles. Outer margin with row of setae on distal 1 / 2. Ending of the row near incisor. Right mandible with eight or nine setae below the mola (Fig. 41 C View Figure 41 ). Maxillae. Posterior margin of cardo with few hair-like setae, together with two stout and long setae in submarginal position. Proximo-lateral margin of stipes with a bunch of five stout setae of irregular length. Apical-ventral row with 22–24 pectinate setae. Maxillary palp segment II 0.86–1.00 as long as segment I. Maxillary palp segment III 0.64–0.95 as long as segment I (Fig. 41 D View Figure 41 ). Stout setae on outer margin of segment I absent. Segment II inner margin with two or three stout setae. Segment II outer margin without stout setae. Segment III inner margin with four stout setae, dorsal surface with few setae at apex. Segment III 1.67–2.00 × as long as base width. Labium. Labial palp segment II 0.70–0.80 as long as segment I. Labial palp segment III 0.74–0.80 as long as segment I (Fig. 41 E View Figure 41 ). Segment I inner margin with 13–15 stout setae, outer margin with 12–15 stout setae. Segment II outer margin with three or four stout setae. Segment III dorsal face with 3–5 stout setae. Segment III 2.91–3.30 × as long as base width. Hypopharynx. Apex of superlingua truncate (Fig. 41 F View Figure 41 ).

Thorax. Dorsal margin of femur with few long, stout, pointed setae; an irregular submarginal row of pointed setae as long as or a little bit shorter than those on the dorsal margin; 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. 42 A View Figure 42 ). Fore tibia with several rows of long simple or feathered setae on ventral margin, dorsal margin with few 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 few 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 few hair-like setae. Tarsal claw slightly hooked with seven or eight denticles progressively larger apically (Fig. 42 B View Figure 42 ).

Abdomen. Gill I – II with single lamella. Gills III – VII with dorsal and ventral lamellae, ventral lamella smaller. Gill I uni-lamellate, with two or three filaments (Fig. 42 D View Figure 42 ), gill II uni-lamellate with four filaments (Fig. 42 E View Figure 42 ), gills III – VI with five or six filaments on dorsal lamella and a single or two filaments on ventral lamella (Fig. 42 F View Figure 42 ), gill VII with three filaments on dorsal lamella and a single filament on ventral lamella (Fig. 42 G View Figure 42 ). Posterior margin of terga IX with minute denticles (Fig. 42 C View Figure 42 ). Posterior margin of terga V – VIII without denticles. Posterolateral projections present on segments VIII – IX.

Derivatio nominis.

This species is dedicated to Prof. Boonsatien Boonsoong (Kasetsart University, Bangkok, Thailand) for his outstanding contributions to our knowledge of Southeast Asian Ephemeroptera .