Papuanatula ( Fijifiliola ) gattolliati, Kaltenbach, 2025

Kaltenbach, Thomas, 2025, Mayflies of the Fiji Islands (Ephemeroptera), ZooKeys 1259, pp. 205-276 : 205-276

Papuanatula ( Fijifiliola) gattolliati sp. nov.

Figs 24 , 25 , 26

Material examined.

Holotype. FIJI • larva; Vanua Levu , Cacaudrove Prov., Seaqaqa Riv., bridge near Saivou village; 16 ° 36 ' 25 " S, 179 ° 08 ' 46 " E; 80 m; 05. xi. 2024; leg. T. Kaltenbach; on slide; GBIFCH 01581988; MZL . Paratypes. • 2 larvae; same data as holotype; on slides; GBIFCH 01581983, GBIFCH 01581989; MZL • 8 larvae; Vanua Levu , Cacaudrove Prov., tributary to Sekawa Riv., near Nakawaga; 16 ° 39 ' 55 " S, 179 ° 20 ' 03 " E; 32 m; 29. x. 2024; leg. T. Kaltenbach; 1 on slide; GBIFCH 01581907; 7 in alcohol; GBIFCH 01581901, GBIFCH 01581906, GBIFCH 01582015; MZL .

Diagnosis.

Larva. Following combination of characters distinguishes P. gattolliati sp. nov. from other species of Fijifiliola subgen. nov.: larva dorsally grey, abdominal segments laterally with blackish marking; femur on anterior side in basal ½ with reddish brown marking in large blank (well-developed on fore femur, less on middle femur and absent on hind femur), large dark grey band in middle area, reddish brown colour in subdistal part; labial palp segment III slightly pentagonal; paracercus with 12–14 segments.

Description.

Larva (Figs 24 – 26 ). Body length 2.9–4.4 mm, cerci ~ 1.5 × body length.

Colouration (Fig. 24 a – c ). Head and thorax dorsally grey with indistinct pattern, fore protoptera grey with dark grey margin; abdomen dorsally grey, terga III and IV darker, terga II and V – VIII darker in anterior part, abdominal segments laterally with oblique, blackish marking. Femur on anterior side in basal ½ with reddish brown marking in large blank (well-developed on fore femur, less on middle femur and absent on hind femur), large dark grey band in middle area, basal and apical margin dark grey, reddish brown colour in subdistal part; femur on posterior side with dark brown marking posteromedially and distomedially, less developed on middle and hind legs; tibia reddish grey in basal ½ and distally, dark grey in distomedial part; tarsus basally and distally reddish grey, medially dark grey; claw dark grey. Head and thorax ventrally yellowish grey, abdomen ventrally grey-brown. Caudalii grey.

Head. Antenna (Fig. 25 h ). Length ~ 2 × head length. As typical for subgenus.

Labrum (Fig. 25 a, b ). Length 0.5 × maximum width. Otherwise, as typical for subgenus.

Right mandible (Fig. 25 f ). Margin between prostheca and mola straight, smooth. Otherwise, as typical for subgenus.

Left mandible (Fig. 25 e ). Margin between prostheca and mola straight, with few minute denticles toward subtriangular process. Otherwise, as typical for subgenus.

Hypopharynx and superlinguae (Fig. 25 d ). As typical for subgenus.

Maxilla (Fig. 25 g ). Maxillary palp slightly longer than galea-lacinia; palp segment II ~ 1.3 × length of segment I. Otherwise, as typical for subgenus.

Labium (Fig. 25 c ). Paraglossa with two spine-like setae on inner, distolateral margin. Labial palp with segment I approx. as long as segments II and III combined. Segment II dorsally with row of four or five spine-like setae near outer, distolateral margin. Segment III slightly pentagonal, 0.6 × length of segment II. Otherwise, as typical for subgenus.

Legs (Fig. 26 a – e ). Ratio of leg segments: fore leg 1.0: 1.0: 0.4: 0.2, middle leg 1.1: 1.0: 0.4: 0.2 and hind leg 1.2: 1.0: 0.3: 0.1. Femur. Length ~ 3 × maximum width. Tibia. With row of short, blunt setae parallel to row of long, fine, simple setae. Claw with one row of 11 or 12 denticles; one posterior seta. Otherwise, as typical for subgenus.

Abdomen. Terga (Fig. 26 f, g ). Posterior margin of terga: I smooth, without denticles, II – IX with triangular, pointed denticles.

Tergalii (Fig. 26 i, j ). Narrow oblong; tracheation well-developed, partly reaching margins, dark brown. Margin smooth, with few short, fine, simple setae.

Paraproct (Fig. 26 h ). Posterior margin with prolongation, with split denticles.

Caudalii (Fig. 25 i, j ). Cerci without swimming setae. Paracercus with 12–14 segments.

Pose of subimaginal gonostyli under larval cuticle. As typical for subgenus.

Subimago. Unknown.

Imago. Unknown.

Egg. Unknown.

Biological aspects.

Larvae living in run or riffles of medium fast flowing lowland rivers (Fig. 38 a, c ).

Etymology.

The species is dedicated to Jean-Luc Gattolliat (Naturéum, Muséum cantonal des Sciences Naturelles, Lausanne, Switzerland), for his long-time contribution to the knowledge of Baetidae , and for teaching me many things about mayflies.

Distribution.

Fiji: Vanua Levu (Fig. 40 a ).

Figures

Figure 24. Papuanatula (Fijifiliola) gattolliati sp. nov., larva, habitus. a. Dorsal view; b. Lateral view; c. Ventral view. Scale bars: 1 mm.

Figure 25. Papuanatula (Fijifiliola) gattolliati sp. nov., larva. a, b. Labrum; c. Labium; d. Hypopharynx and superlinguae; e. Left mandible; f. Right mandible; g. Maxilla; h. Head; i. Paracercus; j. Cercus. Scale bars: 100 µm (h); 20 µm (a, c – g, i); 10 µm (b, j).

Figure 26. Papuanatula (Fijifiliola) gattolliati sp. nov., larva. a. Fore leg; b. Femur, outer margin; c. Tibia; d. Tarsus, outer margin; e. Tarsus, claw; f. Abdomen; g. Abdominal terga; h. Paraproct; i, j. Tergalius IV. Scale bars: 100 µm (f); 50 µm (a); 20 µm (i); 10 µm (b – e, g, h, j).

Figure 38. Habitats. a. Tributary to Sekawa River, near Nakawaga (location E; clean lowland river); b. Sekawa River near Nakawaga (location E 1; lowland river, disturbed by human activities; many filamentous green algae); c. Seaqaqa River, bridge near Saivou (location F). Characteristics of locations see Table 3.

Figure 40. Distribution of described species. a. Papuanatula (Fijifiliola) gattolliati sp. nov. (locations E, F); b. Papuanatula (Fijifiliola) grisea sp. nov. (locations A, B, I); c. Papuanatula (Fijifiliola) sekawa sp. nov. (location E); d. Papuanatula (Fijifiliola) tenebris sp. nov. (location C 1).