Nonnullidens mariae ( Peters & Tsui, 1972 )

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

Nonnullidens mariae ( Peters & Tsui, 1972)

Fig. 51

Thraulus mariae Peters & Tsui, 1972 Orient. Insects 6 (1): 3 (male, female, nymph).

Barba mariae ; Grant and Peters 1993 Trans. Am. Entomol. Soc. 119 (2): 149 (new genus).

nec Nonnullidens mariae ; Kluge, 2013 Zootaxa 3722 (1): 48 (new combination).

Material examined.

Paratypes. • Papua New Guinea two nymphs in ethanol, GBIFCH 01523467 , one nymph on two slides GBIFCH 01223153 (whole body), GBIFCH 01223154 (gills), three female imagos in ethanol, GBIFCH 01523468 , Morobe Province, Bulolo River, east of Wau , 985 m, approx 7°20'16"S, 146°43'42"E, 15–27.X.1964, W. L & J. G. Peters col ( MZL) .

Nymph.

Body length, male: 6.5–7 mm.

Diagnosis.

Medial emargination of labrum narrow with rounded denticles; ventral face of labrum with scattered thin setae; femora pale brown with two transverse dark brown bands in middle and at apex; posterior margin of abdominal segments V – VIII with well-developed denticles.

Colouration.

Head. Greyish brown, oval pale brown maculae in front of the median ocellus. Antenna yellowish, pedicel greyish brown. Compound eyes: lower portion black, upper portion orangish. Mouth parts yellowish brown. Thorax. Pronotum brownish orange, two triangular maculae on each side of the sagittal line (Fig. 51 A ). Mesonotum pale brown, washed with grey laterally. Femur greyish brown, apex pale brown, a pale brown band in the distal 1 / 3. Tibia yellowish, apex ringed with black. Tarsi yellowish. Abdomen. Terga medium brown, posterior margin of terga dark brown, as well as lateral sides. Sterna yellowish brown, posterior margin of sterna greyish brown laterally, nervous ganglia slightly tinted with greyish purple. Gills greyish purple. Terminal filaments pale brown, yellowish at apex.

Description.

Head. Labrum cordiform. Ratio labrum width / clypeus width 1.13. Ratio labrum width / insertion width 1.35. Medial emargination narrow with rounded denticles. Proximal row of setae present, simple. Number of setae on proximal row ~ 95–100. Distal row of setae simple. Median part of labrum in ventral view with scattered thin setae. Mandibles. Outer margin with row of setae on entire margin. Ending of the row near incisor. Right mandible with 7–9 setae below the mola. Maxillae. Posterior margin of cardo with numerous thin and stout setae. Proximo-lateral margin of stipes twisted. Apical-ventral row with 25–27 pectinate setae. Maxillary palp segment II 0.88–0.93 as long as segment I. Maxillary palp segment III 0.68–0.79 as long as segment I (Fig. 51 B ). Stout setae on outer margin of segment I present. Segment II inner margin without stout setae, outer margin without stout setae. Segment III inner margin without stout setae, dorsal surface fully covered with setae. Segment III 1.67–1.80 × as long as base width. Labium. Labial palp segment II 0.80–0.81 as long as segment I. Labial palp segment III 0.62–0.63 as long as segment I. Segment I inner margin with 17–20 stout setae, outer margin with 14–16 stout setae. Segment II outer margin with 17–20 stout setae. Segment III dorsal face with four stout setae. Segment III 2.97–3.02 × as long as base width. Hypopharynx. Apex of superlingua truncate.

Thorax. Dorsal margin of femur with a row of long, stout, pointed setae; irregular submarginal rows of shorter and pointed setae on fore femur, regular row of shorter, pointed setae on hind femur; ventral margin with short, stout setae and a submarginal row of long, pointed stout setae, except on hind leg where those of the submarginal row are short, pointed; central area of upper surface with long, pointed setae, shorter on hind femur. Fore tibia with several rows of long, simple setae on ventral margin, outer margin with few hair-like setae; middle tibia with two rows of long, simple pointed setae on ventral margin, outer margin with few hair-like setae; hind tibia with a row of simple long, thin setae on ventral margin, upper and 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 seven or eight denticles progressively larger apically (Fig. 51 C ).

Abdomen. Gills I – VII with dorsal and ventral lamellae, ventral lamella smaller. Gill I with ~ eight filaments on upper lamella and five on lower lamella, gills II – V with ~ 8–10 filaments on each lamella, gill VI with 5–7 filaments on each lamella, gill VII with four to five filaments on each lamella. Posterior margin of terga V – IX with denticles (Fig. 51 D – G ). Posterolateral projections present on segments VII – IX.

Eggs. General shape rounded. Size 140–145 μm × 85–90 μm (Fig. 51 H ). Chorionic surface smooth. No attachment structures visible. Micropyle not visible.

Figures

Figure 51. Nonnullidens mariae (Peters & Tsui, 1973). A. Habitus; B. Maxilla; C. Claw; D. Posterior margin of tergite IX; E. Posterior margin of tergite VIII; F. Posterior margin of tergite VII; G. Posterior margin of tergite VI; H. Egg. Scale bars: 1 mm (A); 100 µm (B); 50 µm (C – G).