The Leptophlebiidae of New Guinea (Ephemeroptera, Choroterpinae, Thraulini) Sartori, Michel Salles, Frederico F. ZooKeys 2025 2025-07-15 1245 41 175 Sartori & Salles 2025 Insecta Leptophlebiidae Thraulus Animalia Ephemeroptera Arthropoda species noe sp. nov. Thraulus   Figs 11 A, 12, 13, 20 A   Material examined.     Holotype.• Papua New Guinea, nymphon slide, Central Province, Woitape,  700 m,  I.2008,  8°31.290'S, 147°13.684'E, Posmancol [PNG 166], GBIFCH 01223114(  ZSM).    Paratypes.• Papua New Guinea, 2 nymphsin ethanol (  UFVB), 8 nymphsin ethanol, GBIFCH 01523475, 3 entirely mounted on slide, GBIFCH 01223113, GBIFCH 01223112, GBIFCH 01223111, same data as holotype (  MZL). Other material.•  Papua New Guinea, one nymphon slide, GBIFCH 01223109, Central Province, Kokoda Trek,  1390 m,  I.2008,  09°00.338'S, 147°44.252'E. Posmancol [PNG 173] (  MZL). •  Papua New Guinea, one nymphon slide, GBIFCH 01223110, Eastern Highlands Province, Marawaka, Ande,  1700–1800 m,  9.XI.2006, approx.  07°01.697'S, 145°49.807'E, M. Balke& Kinibelcol [PNG 87] (  MZL).   Nymph. Body length, male: 5.1–5.2 mmBody length, female: 6.3–6.5 mm.   Diagnosis. Labrum rectangular, with emargination narrow; proximo-lateral margin of stipes with one long and stout seta together with two small and stout setae; maxillary palp greatly elongated; outer margin of maxillary palp segment II with 1–3 stout setae; inner margin of labial palp segment I with 20–26 stout setae; apex of superlingua rounded. Gills II – VI without filaments on basal half, with ~ 15 filaments on dorsal lamella and ~ 20 on ventral lamella; posterior margin of abdominal segment VIII with minute denticles.   Colouration.   Head.Vertex greyish brown, darker between ocelli. Antenna yellowish, pedicel greyish. Compound eye lower portion black, upper portion reddish brown. Mouth parts and clypeus medium brown.  Thorax.Pronotum greyish brown. Mesonotum pale brown washed with greyish brown laterally (Fig. 11 A). Metanotum dark brown. Femur: forefemur almost completely greyish brown; mid- and hind femora whitish, apical 1 / 3 brownish. Tibia yellowish, apex yellowish brown. Tarsi yellowish brown.  Abdomen.Terga dark brown, posterior margin blackish. Sterna yellowish brown in females to dark brown in males. Gills purplish brown. Terminal filaments uniformly yellowish brown.   Figure 11. Habitus of  Thraulus( Thraulus) noe sp. nov.( A),  Thraulus( Thraulus) ogea sp. nov.( B) and  Thraulus( Thraulus) wemale sp. nov. (C).Scale bars: 1 mm.   Description.   Head. Labrumrectangular (Fig. 12 A). Ratio labrum width / clypeus width 0.88–0.92. Ratio labrum width / insertion width 1.12–1.13. Medial emargination narrow with rounded denticles. Proximal row of setae present, simple. Number of setae on proximal row 69–87. Distal row of setae present, simple. Median part of labrum in ventral view with stout setae in a row (Fig. 12 B).  Mandibles.Outer margin with row of setae on distal 2 / 3, row ending before incisor. Right mandible with 7–10 setae below the mola (Fig. 12 C).  Maxillae.Posterior margin of cardo broken. Proximo-lateral margin of stipes with one long stout seta together with two small stout setae. Apical-ventral row with 15–17 pectinate setae. Maxillary palp extremely long, almost 2 × longer than maxilla; segment II 1.3–1.8 × as long as segment I. Maxillary palp segment III 0.77–0.99 as long as segment 1 (Fig. 12 D). Stout setae on outer margin of segment I present. Segment II inner margin with two stout setae, outer margin with 1–3 stout setae. Segment III inner margin with three or four stout setae, dorsal surface with few setae at apex. Segment III 2.46–3.00 × as long as base width.  Labium.Labial palp segment II 0.67–0.71 as long as segment 1. Labial palp segment III 0.63–0.70 as long as segment 1 (Fig. 12 E). Segment I inner margin with 20–26 stout setae, outer margin with 12–15 stout setae. Segment II outer margin with two or three stout setae. Segment III dorsal face with six stout setae. Segment III 2.15–2.29 × as long as base width.  Hypopharynx.Apex of superlingua rounded (Fig. 12 F).   Figure 12.   Thraulus( Thraulus) noe 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, C – E); 50 µm ( B); 100 µm ( F).   Thorax.Dorsal margin of femur with a row of long stout setae, and a submarginal row of same setae; ventral margin with shorter and stouter setae (Fig. 13 A, B); upper surface with few long and pointed but stout setae. Tarsal claw straight with 4–7 subequal denticles (Fig. 13 C).   Figure 13.   Thraulus( Thraulus) noe 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.Gill I; G.Gill IV, H.Gill VII. Scale bars: 200 µm ( A, B); 50 µm ( C – E).   Abdomen.Gill I with single bifid lamella (Fig. 13 F). Gills II – VII with dorsal and ventral lamellae, dorsal lamella smaller. Gills II – VI with ~ 15 filaments on upper lamella and ~ 20 on the ventral one, filamentous projections lacking on proximal half (Fig. 13 G); gill VII with three filaments on each lamella, one much longer than the other two (Fig. 13 H). Posterior margin of terga IX with denticles (Fig. 13 D). Posterior margin of terga VIII with minute denticles (Fig. 13 E). Posterior margin of terga V – VII without denticles. Posterolateral projections present only on segment VIII – IX.   Eggs.General shape elongated. Size 190 μm × 75 μm. Chorionic surface smooth, with longitudinal ridges weakly elevated, interrupted partially in the equatorial area. No attachment structures. Micropyle in equatorial position (Fig. 20 A).   Derivatio nominis. This species is dedicated to Noe Sartori, grandson of the first author, and is a noun in apposition. 5218714361 2008-01 ZSM Posman Papua New Guinea 700 -8.5215 Woitape 1 147.22807 GBIFCH 01223114 1 1 Central Province holotype 5218714325 2008-01 UFVB, MZL Posman Papua New Guinea 700 -8.5215 Woitape 1 147.22807 GBIFCH 01523475, GBIFCH 01223113, GBIFCH 01223112, GBIFCH 01223111 10 10 Central paratype 5218714345 2008-01 MZL Posman Papua New Guinea 1390 -9.005633 Kokoda Trek 1 147.73753 GBIFCH 01223109 1 1 Central Province 5218714321 2006-11-09 MZL M. Balke & Kinibel Papua New Guinea 1750 -7.028283 Ande 1 145.83012 Marawaka GBIFCH 01223110 1 1 Eastern Highlands Province