Papuanatula (Fijifiliola) bula sp. nov.

Figs 12, 13, 14

Material examined.

Holotype. FIJI • larva; Viti Levu, Rewa Prov., Colo-I-Suva Forest Park, creek near Coloisuva; 18 ° 03 ' 35 " S, 178 ° 28 ' 11 " E; 160 m; 12. xi. 2024; leg. T. Kaltenbach; on slide; GBIFCH 01581921; MZL. Paratypes. • 5 larvae; same data as holotype; 1 on slide; GBIFCH 01581920; 4 in alcohol; GBIFCH 01581919, GBIFCH 01581955, GBIFCH 01581965; MZL • 6 larvae; Viti Levu, Serua Prov., Biausevu Riv., near Biausevu; 18 ° 10 ' 57 " S, 177 ° 44 ' 13 " E; 70 m; 10. xi. 2024; leg. T. Kaltenbach; 2 on slides; GBIFCH 01581982, GBIFCH 01221827; 4 in alcohol; GBIFCH 01581979, GBIFCH 01581980, GBIFCH 01581981, GBIFCH 01582014; MZL • 1 larva; Viti Levu, Ba Prov., creek, near Outback Hotel; 17 ° 38 ' 12 " S, 177 ° 45 ' 29 " E; 157 m; 25. x. 2024; leg. T. Kaltenbach; in alcohol; GBIFCH 01581913; MZL • 5 larvae; Viti Levu, Ba Prov., creek, near Outback Hotel; 17 ° 38 ' 22 " S, 177 ° 45 ' 30 " E; 220 m; 25. x. 2024; leg. T. Kaltenbach; in alcohol; GBIFCH 01581915, GBIFCH 01581914; MZL.

Diagnosis.

Larva. Following combination of characters distinguishes P. bula sp. nov. from other species of Fijifiliola subgen. nov.: femur basally with narrow dark brown to red-brown, longitudinal streak in large blank; abdominal terga II, VII, VIII dark brown, I, III – V, IX, X brighter, washy grey-brown; labial palp segment III slightly pentagonal; paracercus with 13–15 segments; cerci in middle part with one medium swimming seta each 2 nd segment (Fig. 13 j).

Description.

Larva (Figs 12 – 14). Body length 2.9–4.5 mm, cerci ~ 1.4 × body length.

Colouration (Figs 12 a – c, 13 l). Head dorsally brown, with dark brown markings; thorax dorsally dark brown; abdominal terga II, VII, VIII dark brown, I, III – V, IX, X brighter, washy grey-brown. Legs grey-brown; femur on anterior side in basal part with narrow dark brown to red-brown, hypodermal, longitudinal streak in large blank; medially with indistinct, broad, dark grey band; in distal area reddish brown; femur of all legs on posterior side reddish brown in distal ⅓, with one or two parallel, dark brown, hypodermal, longitudinal streaks. Head, thorax and abdomen ventrally grey to dark grey, sternites VI – VIII darker. Caudalii grey.

Head. Antenna (Fig. 13 l). Length ~ 1.5 × head length. As typical for subgenus.

Labrum (Fig. 13 a, b). Length 0.6 × maximum width. Otherwise, as typical for subgenus.

Right mandible (Fig. 13 f). Margin between prostheca and mola slightly convex, smooth. Otherwise, as typical for subgenus.

Left mandible (Fig. 13 e). Margin between prostheca and mola straight, with few denticles toward subtriangular process. Otherwise, as typical for subgenus.

Hypopharynx and superlinguae (Fig. 13 d). As typical for subgenus.

Maxilla (Fig. 13 g, h). Maxillary palp approx. as long as galea-lacinia; palp segment II ~ 1.2 × longer than segment I. Otherwise, as typical for subgenus.

Labium (Fig. 13 c). Paraglossa with one or two spine-like setae on inner, distolateral margin. Labial palp with segment I subequal to 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. 14 a – f). Ratio of leg segments: fore leg 1.0: 1.0: 0.4: 0.2, middle leg 1.0: 1.0: 0.4: 0.2 and hind leg 1.1: 1.0: 0.4: 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 11 or 12 denticles; one posterior seta. Otherwise, as typical for subgenus.

Abdomen. Terga (Fig. 14 g, h). Posterior margin of terga: I smooth, without denticles; II with rudimentary denticles in middle part, III – IX with triangular, pointed denticles.

Tergalii (Fig. 14 i). Elongate oval; tracheation well-developed, not reaching margins, brown; margin smooth, without setae.

Paraproct (Fig. 14 j). Posterior margin with prolongation, with split denticles.

Caudalii (Fig. 13 i – k). Cerci in middle area with one swimming seta each 2 nd segment, distally up to three swimming setae per segment. Paracercus with 13–15 segments.

Pose of subimaginal gonostyli under larval cuticle. Unknown.

Subimago. Unknown.

Imago. Unknown.

Egg. Unknown.

Biological aspects.

Larvae living in run of medium fast to fast flowing rivers with both, pristine water (Fig. 37 c, d) or influenced by human activities (Fig. 37 a).

Etymology.

The species name refers to the Fijian word “ bula ”, meaning hello or welcome, which you hear everywhere from the friendly people in Fiji.

Distribution.

Fiji: Viti Levu (Fig. 39 d).