Kosminympha balkei, 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.15923271
persistent identifier	https://treatment.plazi.org/id/2AB4154D-4F43-54D9-B6B4-D837701847FB
treatment provided by	ZooKeys by Pensoft
scientific name	Kosminympha balkei
status	sp. nov.

Treatment

Kosminympha balkei sp. nov.

Figs 34 K View Figure 34 , 60 A View Figure 60 , 65 View Figure 65 , 66 View Figure 66

Material examined.

Holotype. • Papua New Guinea, one nymph on slide, Eastern Highlands Province, Marawaka, Ande , 1700–1800 m, 9.XI.2006, approx. 07°01.697'S, 145°49.807'E, M. Balke & Kinibel col [PNG 87], GBIFCH 01223158 ( ZSM) GoogleMaps . Paratypes. • Papua New Guinea, one nymph on slide GBIFCH 01223157 , 2 nymphs in ethanol, GBIFCH 01523449 , same data as holotype ( MZL) GoogleMaps .

Nymph.

Body length, female: 10.5 mm.

Diagnosis.

Labrum cordiform; median part of labrum in ventral view with a row of stout and short setae; abdominal tergites predominantly orange with dark lateral marks; gills II – VI with ~ 15 filaments on each lamella; posterior margin of abdominal segment VII with minute denticles; posterolateral expansions present on abdominal segments V – IX.

Colouration.

Head. Medium brown, washed with greyish brown between ocelli, pale brown between lateral ocelli and compound eyes, clypeus medium brown. Antenna uniformly yellowish. Mouth parts brownish. Thorax. Pronotum medium brown, pale brown laterally, two dark brown arch-like maculae close to the sagittal line. Mesonotum pale brown, medium brown on antero-lateral corners, fore wing pads medium brown (Fig. 60 A View Figure 60 ). Femur uniformly yellowish brown, fore femur with proximal 1 / 3 whitish. Tibia yellowish orange. Tarsi yellowish orange. Abdomen. Terga brownish orange, segment II – VII with a pair of more or less triangular dark brown maculae along the sagittal line, segment IX with a pair of square dark brown maculae, segment X entirely brownish orange. Sterna yellowish from segments I – IV, becoming brownish yellow to brownish orange posteriorly. Gills purple. Terminal filaments yellowish, darker near base.

Description.

Head. Labrum cordiform (Fig. 65 A View Figure 65 ). Ratio labrum width / clypeus width 0.96. Ratio labrum width / insertion width 1.24–1.30. Medial emargination narrow with pointed denticles. Proximal row of setae present, simple. Number of setae on proximal row ~ 82–93. Distal row of setae multiple. Median part of labrum in ventral view with stout setae in row (Fig. 65 B View Figure 65 ). Mandibles. Outer margin with row of setae on distal 1 / 2. Ending of the row near incisor. Right mandible with 15–22 setae below the mola (Fig. 65 C View Figure 65 ). Maxillae. Posterior margin of cardo with many hair-like and long setae, together with two or three long and stout setae in submarginal position. Proximo-lateral margin of stipes with a bunch of ten long hair-like setae (Fig. 34 K View Figure 34 ). Apical-ventral row with 14–15 pectinate setae. Maxillary palp segment II 0.80–0.81 as long as segment I. Maxillary palp segment III 0.57–0.65 as long as segment I (Fig. 65 D View Figure 65 ). Stout setae on outer margin of segment I absent. Segment II inner margin with 1–3 stout setae, outer margin without stout setae. Segment III inner margin with four stout setae, dorsal surface half covered with setae. Segment III 1.53–1.56 × as long as base width. Labium. Labial palp segment II 0.88 as long as segment I. Labial palp segment III 0.76–0.80 as long as segment I (Fig. 65 E View Figure 65 ). Segment I inner margin with 25–35 stout setae, outer margin with 28–30 stout setae. Segment II outer margin with 12 stout setae. Segment III dorsal face with six or seven stout setae. Segment III 2.53–2.71 × as long as base width. Hypopharynx. Apex of superlingua emarginated (Fig. 65 F View Figure 65 ).

Thorax. Dorsal margin of femur with a row of very long, thin, pointed setae; irregular submarginal rows of pointed setae as long as or a little bit shorter than those on the dorsal margin, these setae decrease in size from the fore- to the hind femur (Fig. 66 A – B View Figure 66 ); ventral margin with short, stout setae and irregular submarginal rows of long, pointed stout setae, except on hind leg where those on ventral margin are shorter; central area of upper surface with numerous long, stout, pointed setae, shorter on hind femur. Fore tibia with several rows of long simple or feathered setae on ventral margin, dorsal margin with numerous hair-like setae; middle tibia with two rows of long, simple, pointed setae on ventral margin, outer margin with numerous hair-like setae; hind tibia with several rows of simple and feathered long, stout setae on ventral margin, lower surface covered with simple and feathered setae, outer margin with short and long pointed stout setae and hair-like setae. Tarsal claw hooked with eight or nine denticles progressively larger apically (Fig. 66 C View Figure 66 ).

Abdomen. Gill I with both lamellae. Gills II – VII with dorsal and ventral lamellae of the same size. Gill I with ~ 10 filaments on each lamella, gills II – VI with ~ 15 filaments on each lamella, gill VII minute with 5–7 filaments on each lamella. Filamentous projections on apex. Posterior margin of terga IX with denticles. Posterior margin of terga VII – VIII with minute denticles. Posterior margin of terga V – VI without denticles. Posterolateral projections present on segments V – IX.

Derivatio nominis.

This species is dedicated to Dr Michael Balke ( ZSM, Germany), collector of most of the species treated here.