Kosminympha sabrinae, Sartori & Salles, 2025

Sartori, Michel & Salles, Frederico F., 2025, The Leptophlebiidae of New Guinea (Ephemeroptera, Choroterpinae, Thraulini), ZooKeys 1245, pp. 41-175 : 41-175

Kosminympha sabrinae sp. nov.

Figs 61 B , 64 E, F , 73 , 74

Material examined.

Holotype. • Papua New Guinea, nymph on slide, Gulf Province, Marawaka, Mala , 1400 m, 11.XI.2006, 07°05.664'S, 145°44.467'E, M. Balke and Kinibel col [PNG 90], GBIFCH 01223165 ( ZSM) . Paratypes. • Papua New Guinea, one nymph in ethanol ( UFVB), one nymph on slide, GBIFCH 01223166 , 3 nymphs in ethanol, GBIFCH 01523451 , same data as holotype ( MZL) . • Papua New Guinea, one nymph on slide, GBIFCH 01223167 , one nymph in ethanol, GBIFCH 01523455 , Central Province, Kokoda Trek , 1400 m, I.2008, 09°14.339'S, 147°40.538'E, Posman col [PNG 171] ( MZL) . • Papua New Guinea, 2 nymphs on slide, GBIFCH 01223168 , GBIFCH 01223169 , 3 nymphs in ethanol, GBIFCH 01523452 , Central Province, Kokoda Trek , 1390 m, I.2008, 09°00.338'S, 147°44.252'E. Posman col [PNG 173] ( MZL) . • Papua New Guinea, 3 nymphs on slide GBIFCH 01223170 , GBIFCH 01223171 , GBIFCH 01223172 , 4 nymphs in ethanol, GBIFCH 01523454 , Western Highlands Province, Kundum , 1400 m, 3.III.2007, 05°16.096'S, 144°27.869'E, Kinibel col [PNG 142] ( MZL) . • Papua New Guinea, 3 nymphs on slide, GBIFCH 01223173 , GBIFCH 01223174 , GBIFCH 01223175 , one nymph in ethanol, GBIFCH 01523453 , Madang Province, Simbai area , 1200 m, 10.III.2007, 05°13.389'S, 144°37.285'E, Kinibel col [PNG 152] ( MZL) . • Papua New Guinea, one nymph on slide, GBIFCH 01223176 , Madang Province, Simbai area , 1200 m, 11.III.2007, 05°13.333'S, 144°37.611'E, Kinibel col [PNG 153] ( MZL) . • Papua New Guinea, one nymph on slide, GBIFCH 01223177 , Western Highlands Province, Simbai , 1800–2000 m, 26.II.2007, 05°15.872'S, 144°32.717'E, Kinibel col [PNG 134] ( MZL) .

Nymph.

Body length, male: 10.5 mm Body length, female: 12.5 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 ~ 25 filaments on each lamella; posterior margin of abdominal segment VII with minute denticles; posterolateral expansions present on abdominal segments VI – IX.

Colouration.

Head. Medium brown, washed with greyish brown between ocelli, pale brown between lateral ocelli and compound eyes, clypeus brownish orange. Antenna uniformly yellowish. Compound eye lower portion black, upper portion brownish orange. Mouth parts brownish orange. Thorax. Pronotum pale brown, lateral margin dark brown, as well as a characteristic double arrow-like macula in the medium pointing towards the head. Mesonotum pale brown bordered with dark brown margins; forewing pads uniformly dark brown. Femur uniformly pale brown, fore femur with proximal 1 / 3 whitish. Tibia pale to medium brown. Tarsi medium brown. Abdomen. Terga uniformly 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 rectangular dark brown maculae, segment X entirely brownish orange (Fig. 61 B ). Sterna yellowish from segments I – IV, becoming brownish yellow to brownish orange posteriorly. Gills greyish purple. Terminal filaments uniformly yellowish orange.

Description.

Head. Labrum cordiform (Fig. 73 A ). Ratio labrum width / clypeus width 0.96–1.02. Ratio labrum width / insertion width 1.19–1.26. Medial emargination narrow with pointed denticles. Proximal row of setae present, simple. Number of setae on proximal row ~ 88–96. Distal row of setae multiple. Median part of labrum in ventral view with stout setae in row (Fig. 73 B ). Mandibles. Outer margin with row of setae on distal 1 / 2. Ending of the row near incisor. Right mandible with 12–15 setae below the mola (Fig. 73 C ). Maxillae. Posterior margin of cardo with many long, stout and pointed setae together with some hair-like setae. Proximo-lateral margin of stipes with a bunch of ~ 10 long hair-like setae. Apical-ventral row with 12–15 pectinate setae. Maxillary palp segment II 0.86–1.00 as long as segment I (Fig. 73 D ). Maxillary palp segment III 0.67–0.78 as long as segment I. Stout setae on outer margin of segment I absent. Segment II inner margin with one or two stout setae, outer margin with 3–5 stout setae. Segment III inner margin with 3–5 stout setae, dorsal surface half covered with setae. Segment III 1.53–2.40 × as long as base width. Labium. Labial palp segment II 0.75–0.85 as long as segment I. Labial palp segment III 0.67–0.83 as long as segment I (Fig. 73 E ). Segment I inner margin with 26–30 stout setae, outer margin with 24–30 stout setae. Segment II outer margin with 12–22 stout setae. Segment III dorsal face with 5–10 stout setae. Segment III 2.56–3.00 × as long as base width. Hypopharynx. Apex of superlingua emarginated (Fig. 73 F ).

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, ventral margin with short, stout setae and submarginal rows of long, pointed stout setae, except on hind leg where those on ventral margin are shorter (Fig. 74 A – B ); 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 several 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 to ten denticles progressively larger apically (Fig. 74 C ).

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 (Fig. 74 G ), gills II – VI with 20–25 filaments on each lamella (Fig. 74 H ), gill VII with 12–15 filaments on each lamella. Filamentous projections on apex, or along entire margin. Posterior margin of terga IX with denticles (Fig. 74 D ). Posterior margin of terga VIII with minute denticles, or with larger denticles (Fig. 74 E ). Posterior margin of terga VII with minute denticles (Fig. 74 F ). Posterior margin of terga V – VI without denticles. Posterolateral projections present on segment VI – IX.

Eggs. General shape elongated. Size 205–210 μm × 90–95 μm. Chorionic surface smooth with longitudinal ridges well marked having the appearance of being segmented. Attachment structures at each pole composed of four anchors with long stem, reaching the middle of the egg (Fig. 64 E – F ). Micropyle not visible.

Derivatio nominis.

This species is dedicated to Sabrina Perret Sartori, daughter in law of the first author.

Figures

Figure 61. Habitus of Kosminympha baruya sp. nov. (A), Kosminympha sabrinae sp. nov. (B) and Kosminympha paulinae sp. nov. (C). Scale bars: 1 mm.

Figure 64. Egg structure in toto (A, C, E, F), detail of chorion and micropyle (B, D). A, B. Thraulus (Masharikella) samueli sp. nov.; C, D. Nonnullidens fuyugensis sp. nov.; E, F. Kosminympha sabrinae sp. nov.

Figure 73. Kosminympha sabrinae sp. nov. nymphal mouthparts. A. Labrum, dorsal view; B. Emargination of the labrum; C. Right mandible; D. Maxilla; E. Labium; F. Superlingua of hypopharynx. Scale bars: 200 µm (A – F); 100 µm (B).

Figure 74. Kosminympha sabrinae sp. nov. thorax and abdomen. A. Fore femur; B. Hind femur; C. Claw; D. Posterior margin of tergite IX; E. Posterior margin of tergite VIII; F. Posterior margin of tergite VII; G. Gill I; H. Gill IV. Scale bars: 200 µm (A, B); 100 µm (C – F).