Nonnullidens cozzarolae, Sartori & Salles, 2025

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

Nonnullidens cozzarolae sp. nov.

Figs 35 C , 43 , 44

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 01223134 ( ZSM) . Paratypes. • Papua New Guinea, 2 nymphs on slide, GBIFCH 01223135 , GBIFCH 01223136 , 5 nymphs in ethanol, GBIFCH 01523461 , same data as holotype ( MZL) . • Papua New Guinea, 3 nymphs on slide, GBIFCH 01223137 , GBIFCH 01223138 , GBIFCH 01223139 , one nymph in ethanol, GBIFCH 01523462 , Central Province, Kokoda Trek , 1390 m, I.2008, 09°00.338'S, 147°44.252'E, Posman col [PNG 173] ( MZL) . • Papua New Guinea, one nymph on slide GBIFCH 01223140 , 2 nymphs in ethanol, GBIFCH 01523463 Western Highlands Province, Kundum , 1400 m, 3.III.2007, 05°16.096'S, 144°27.869'E, Kinibel col [PNG 142] ( MZL) .

Nymph.

Body length, male: 5 mm; female: 5.25 mm.

Diagnosis.

Femora uniformly dark brown, without transverse bands; gill I with ventral lamella composed of one or two filaments; gills II – VI with four to six filaments on dorsal lamella and three or four on ventral lamella, gill VII with 2–4 filaments on each lamella; posterolateral projections present on segments VII – IX.

Colouration.

Head. Vertex greyish brown, with characteristic yellowish maculae posteriorly, frons medium brown with a middle pale brown oval macula. Antenna: scape yellowish, pedicel and flagellum pale brown. Compound eye upper portion reddish brown. Mouth parts pale brown. Thorax. Pronotum pale brown, dark brown laterally and medio-anteriorly. Mesonotum greyish brown laterally, with a pale brown central area as in Fig. 35 C . Femur greyish brown, lighter at base. Fore tibia greyish brown, mid- and hind tibia pale brown, apex greyish brown. Tarsi pale brown. Abdomen. Terga dark brown, with a pale brown macula of the middle of segments IV – IX, increasing in size posteriorly, segment X almost completely pale brown. Sterna pale brown, greyish brown in the middle on each side of a sagittal line pale brown. Gills greyish brown. Terminal filaments yellowish to pale brown.

Description.

Head. Labrum cordiform (Fig. 43 A ). Ratio labrum width / clypeus width 1.06–1.13. Ratio labrum width / insertion width 1.46–1.56. Medial emargination shallow with flat denticles. Proximal row of setae present, simple. Number of setae on proximal row ~ 33–58. Distal row of setae present, simple. Median part of labrum in ventral view with only scattered stout setae (Fig. 43 B ). Mandibles. Outer margin with row of setae on distal 1 / 2. Ending of the row near incisor. Right mandible with 7–10 setae below the mola (Fig. 43 C ). Maxillae. Posterior margin of cardo with few hair-like and some stout setae, together with one long and stout seta in submarginal position. Proximo-lateral margin of stipes with a bunch of ten stout medium size and short setae. Apical-ventral row with 22–29 pectinate setae. Maxillary palp segment II 0.80–1.00 as long as segment I. Maxillary palp segment III 0.68–0.86 as long as segment I (Fig. 43 D ). Stout setae on outer margin of segment I absent. Segment II inner margin with four or five stout setae. Segment II outer margin without or with one stout seta. Segment III inner margin with 3–5 stout setae, dorsal surface with few setae at apex. Segment III 1.57–1.83 × as long as base width. Labium. Labial palp segment II 0.71–0.94 as long as segment I. Labial palp segment III 0.73–0.81 as long as segment I (Fig. 43 E ). Segment I inner margin with 10–12 stout setae, outer margin with 10–12 stout setae. Segment II outer margin with 3–5 stout setae, dorsal face with 3–5 stout setae. Segment III 2.90–3.40 × as long as base width. Hypopharynx. Apex of superlingua truncate (Fig. 43 F ).

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; 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. 44 A – B ). 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 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 4–6 denticles progressively larger apically (Fig. 44 C ).

Abdomen. Gill I with both lamellae. Gills II – VII with dorsal and ventral lamellae, ventral lamella smaller. Gill I with three or four filaments on dorsal lamella, ventral lamella with a single or two filaments (Fig. 44 E ), gills II – VI with 4–6 filaments on dorsal lamella and three or four on ventral lamella (Fig. 44 F ), gill VII with 2–4 filaments on each lamella (Fig. 44 G ). Posterior margin of terga IX with minute denticles (Fig. 44 D ). Posterior margin of terga V – VIII without denticles. Posterolateral projections present on segments VII – IX.

Derivatio nominis.

This species is dedicated to Dr Camille-Sophie Cozzarolo, who performed the first genetic work which revealed the diversity of New Guinean Thraulini .

Figures

Figure 35. Habitus of Nonnullidens anga sp. nov. (A), Nonnullidens fuyugensis sp. nov. (B) and Nonnullidens cozzarolae sp. nov. (C). Scale bars: 1 mm.

Figure 43. Nonnullidens cozzarolae 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).

Figure 44. Nonnullidens cozzarolae sp. nov. thorax and abdomen. A. Fore femur; B. Hind femur; C. Claw; D. Posterior margin of tergite IX; E. Gill I; F. Gill IV; G. Gill VII. Scale bars: 200 µm (A, B); 50 µm (C, D).