Papuanatula ( Fijifiliola ) aurantica, Kaltenbach, 2025

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

publication ID	https://doi.org/10.3897/zookeys.1259.168521
publication LSID	lsid:zoobank.org:pub:48F9008F-BC5F-49BA-994A-2142AF2EAE55
DOI	https://doi.org/10.5281/zenodo.17583254
persistent identifier	https://treatment.plazi.org/id/197B2BA0-998D-5793-B665-5DEF9025D817
treatment provided by	ZooKeys by Pensoft
scientific name	Papuanatula ( Fijifiliola ) aurantica
status	sp. nov.

Treatment

Papuanatula ( Fijifiliola) aurantica sp. nov.

Figs 9 View Figure 9 , 10 View Figure 10 , 11 View Figure 11

Material examined.

Holotype. FIJI • larva; Viti Levu , Serua Prov., Biausevu Riv., near Biausevu; 18 ° 10 ' 57 " S, 177 ° 44 ' 13 " E; 70 m; 10. xi. 2024; leg. T. Kaltenbach; on slides; GBIFCH 01221830, GBIFCH 01582013; MZL. GoogleMaps

Diagnosis.

Larva. Following combination of characters distinguishes P. aurantica sp. nov. from other species of Fijifiliola subgen. nov.: Head, thorax, and abdomen predominantly orange to orange-brown; legs in basal part with orange-brown, hypodermal marking in oval blank; medially with broad, grey band; with orange streak along outer margin and orange in subdistal part; labial palp segment III slightly pentagonal; paracercus with 14 segments.

Description.

Larva (Figs 9 View Figure 9 – 11 View Figure 11 ). Body length ~ 3 mm, cerci ~ 1.3 × body length.

Colouration (Fig. 9 a – c View Figure 9 ). Head, thorax and abdomen dorsally predominantly orange to orange-brown, thorax with indistinct pattern, fore protoptera grey; abdominal terga I – III laterally with oblique, brown streaks. Head, thorax, and abdomen ventrally beige. Legs in basal part with orange-brown, hypodermal marking in oval blank; medially with broad, grey band; with orange streak along outer margin and orange in subdistal part; distally dark grey; femur of all legs on posterior side with brown streak in distomedial area along outer margin. Caudalii grey.

Head. Antenna (Fig. 10 h View Figure 10 ). Length ~ 1.5 × head length. As typical for subgenus.

Labrum (Fig. 10 a, b View Figure 10 ). Length 0.6 × maximum width. Otherwise, as typical for subgenus.

Right mandible (Fig. 10 f View Figure 10 ). Margin between prostheca and mola straight, with few minute denticles. Otherwise, as typical for subgenus.

Left mandible (Fig. 10 e View Figure 10 ). Margin between prostheca and mola straight, with few denticles toward subtriangular process. Otherwise, as typical for subgenus.

Hypopharynx and superlinguae (Fig. 10 d View Figure 10 ). As typical for subgenus.

Maxilla (Fig. 10 g View Figure 10 ). Maxillary palp approx. as long as galea-lacinia; palp segment II ~ 1.2 × longer than segment I. Otherwise, as typical for subgenus.

Labium (Fig. 10 c View Figure 10 ). Paraglossa with two spine-like setae on inner, distolateral margin. Labial palp with segment I ~ 1.2 × length of 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, 0.7 × length of segment II. Otherwise, as typical for subgenus.

Legs (Fig. 11 a – f View Figure 11 ). Ratio of leg segments: fore leg 0.9: 1.0: 0.3: 0.2, middle leg 1.1: 1.0: 0.4: 0.2 and hind leg 1.1: 1.0: 0.3: 0.2. Femur. Length ~ 3 × maximum width. Setae on outer margin long, flattened, pointed. Tibia. With one row of short, blunt setae on each side of row of long, fine, simple setae. Claw with one row of ten or eleven denticles; one posterior seta. Otherwise, as typical for subgenus.

Abdomen. Terga (Fig. 11 g View Figure 11 ). Posterior margin of terga: I smooth, without denticles; II – IX with triangular denticles.

Tergalii (Fig. 11 h View Figure 11 ). Elongate oval; tracheation mainly limited to main trunk, brown; scattered orange pigmentation outside tracheae; margin smooth, with short, fine, simple setae.

Paraproct (Fig. 11 i View Figure 11 ). Posterior margin with prolongation, with denticles.

Caudalii (Fig. 10 i, k View Figure 10 ). Cerci without swimming setae. Paracercus with 14 segments.

Pose of subimaginal gonostyli under larval cuticle. Unknown.

Subimago. Unknown.

Imago. Unknown.

Egg. Unknown.

Biological aspects.

Local species, only known from Biausevu River. Larvae living in run of medium fast flowing rivers (Fig. 37 c View Figure 37 ), in natural forest with pristine water.

Etymology.

The species name refers to its predominantly orange colour, aurantica meaning orange in Latin.

Distribution.

Fiji: Viti Levu (Fig. 39 c View Figure 39 ).