Papuanatula ( Papuafiliola ) longabranchias Kaltenbach, Kovács & Gattolliat, 2025

Kaltenbach, Thomas, Kovács, Tibor & Gattolliat, Jean-Luc, 2025, New species of Papuanatula Lugo-Ortiz & McCafferty, 1999 from New Guinea (Ephemeroptera, Baetidae) with focus on Batanta Island, ZooKeys 1259, pp. 1-55 : 1-55

publication ID	https://doi.org/10.3897/zookeys.1259.168419
publication LSID	lsid:zoobank.org:pub:2A99E3EF-D053-481C-A087-F5058972DC96
DOI	https://doi.org/10.5281/zenodo.17578763
persistent identifier	https://treatment.plazi.org/id/993AB681-5BE7-5EF5-92FC-ECA16C6A659C
treatment provided by	ZooKeys by Pensoft
scientific name	Papuanatula ( Papuafiliola ) longabranchias Kaltenbach, Kovács & Gattolliat
status	sp. nov.

Treatment

Papuanatula ( Papuafiliola) longabranchias Kaltenbach, Kovács & Gattolliat sp. nov.

Figs 23 View Figure 23 , 24 View Figure 24 , 25 View Figure 25 , 26 View Figure 26 , 27 View Figure 27

Type material.

Holotype. Indonesia • larva; West Papua, Batanta Island, Kalijakut River ; 00°52'27"S, 130°37'52"E; 420 m; 09. ii. 2024; leg. T. Kovács; on slide; GBIFCH 00975882 ; 2024-12, EPHTYP-18; MM GoogleMaps . Paratypes. 2 larvae; same data as holotype; on slides; GBIFCH 00975883 , GBIFCH 00975884 ; MZL GoogleMaps • 3 ♂ imagos, 30 subimagos; West Papua, Batanta Island, valley of Kalijakut River ; 00°53'03"S, 130°38'13"E; 182 m; 15. ii. 2023; at light; leg. T. Kovács, R. Horváth, P. Juhász, K. Sauyai, R. Sauyai; 1 imago on slide, thorax in alcohol; GBIFCH 01221781 , GBIFCH 00975811 ; 2 imagos in alcohol; GBIFCH 00975939 , GBIFCH 00975940 ; 30 subimagos; 28 in alcohol; GBIFCH 00975941 ( 13 ♂, 10 ♀), GBIFCH 00975942 ( ♂), GBIFCH 00975943 ( ♂), GBIFCH 00975944 ( 2 ♂, 1 ♀); 2 on slides; GBIFCH 01221833 ( ♀), GBIFCH 01221834 ( ♂); MZL GoogleMaps • 15 subimagos; West Papua, Batanta Island, valley of Tanjung Lampu River ; 00°53'43"S, 130°36'39"E; 18. ii. 2020; at light; leg. T. Kovács, R. Horváth, P. Juhász; in alcohol; GBIFCH 00975952 ( 9 ♂, 4 ♀), GBIFCH 00975953 ( ♂), GBIFCH 00975954 ( ♂); MZL GoogleMaps • 15 subimagos; West Papua, Batanta Island, valley of Kalijakut River ; 00°52'49"S, 130°38'05"E; 232 m; 19. ii. 2020; at light; leg. T. Kovács, R. Horváth, P. Juhász, K. Sauyai, R. Sauyai; in alcohol; GBIFCH 00975948 ( 6 ♂, 6 ♀), GBIFCH 00975949 ( ♂), GBIFCH 00975950 ( ♂), GBIFCH 00975951 ( ♂); MZL GoogleMaps • 7 subimagos ( 4 ♂, 3 ♀); West Papua, Batanta Island, valley of Tanjung Lampu River ; 00°53'43"S, 130°36'39"E; 175 m; 21. ii. 2018; at light; leg. T. Kovács, R. Horváth, P. Juhász, K. Sauyai, R. Sauyai; in alcohol; GBIFCH 00975945 , GBIFCH 00975946 , GBIFCH 00975947 ; MZL GoogleMaps • 3 larvae; West Papua, Batanta Island, Kalijakut River ; 00°52'27"S, 130°37'52"E; 420 m; 20. ii. 2025; leg. T. Kovács; 2 in alcohol; GBIFCH 01582002 ; MZL; 1 in alcohol; 2025-18.a, EPHTYP-19; MM GoogleMaps • 6 larvae; West Papua, Batanta Island, Kalijakut River ; 00°53'03"S, 130°38'13"E; 182 m; 19. ii. 2025; leg. T. Kovács; in alcohol; 2025-17, EPHTYP-20; MM GoogleMaps .

Diagnosis.

Larva. The following combination of characters distinguishes P. longabranchias sp. nov. from other species of Papuanatula ( Papuafiliola) : abdomen dorsally without long setae on midline; without median protuberances on abdominal terga; abdomen dorsally pale brown, with short, dark brown, lateral streaks along anterior margin of terga I – VII (VIII); femur with dark brown, shoe-shaped marking (marking longer than broad); tergalii very long and narrow; paracercus with 17 or 18 segments. The larva is hardly distinguished from P. stenophylla Kaltenbach, Kluge & Gattolliat, 2025 .

Description.

Larva (Fig. 23 View Figure 23 – 25 View Figure 25 ). Body length 3.1–3.7 mm, cerci broken.

Cuticular coloration (Figs 23 a – c View Figure 23 , 25 g View Figure 25 ). Head, thorax and abdomen dorsally pale brown, mesonotum with some lighter areas, metanotum medially darker brownish. Legs pale brown, with large blank in basal part and small blank area in distal part. Head, thorax and abdomen ventrally beige. Cerci light brownish.

Hypodermal coloration (Fig. 23 a, b View Figure 23 ). Abdomen dorsally with short, dark brown, lateral streaks along anterior margin of terga I – VII (VIII). Anterior side of femur with shoe-shaped, dark brown marking in blank area, longer than wide. Posterior side of femur with dark brown streak in outer distal area.

Head. Antenna (Fig. 24 j View Figure 24 ). As typical for the subgenus, with each flagellomere symmetric, cylindrical.

Developing turbinate eyes in last instar male larva (Figs 23 a View Figure 23 , 24 j View Figure 24 ) large, roundish.

Labrum (Fig. 24 a View Figure 24 ) Length 0.6 × maximal width. With reduced, submarginal arc of three long, simple setae. Otherwise, as typical for subgenus.

Right mandible (Fig. 24 c View Figure 24 ) Incisor with five denticles; kinetodontium with three denticles, inner lateral margin with row of small denticles, becoming smaller and finer toward base, and with row of short, fine setae; margin between prostheca and mola slightly convex, smooth. Otherwise, as typical for subgenus.

Left mandible (Fig. 24 b View Figure 24 ) Incisor with five denticles, kinetodontium with four denticles; margin between prostheca and subtriangular process straight, with few minute denticles. Otherwise, as typical for subgenus.

Hypopharynx (Fig. 24 f View Figure 24 ) with tuft of long, straight, stout, spine-like setae. Otherwise, as typical for the genus.

Maxilla (Fig. 24 g View Figure 24 ). Maxillary palp approx. as long as galea-lacinia; segment II ~ 1.5 × length of segment I. Otherwise, as typical for the genus.

Labium (Fig. 24 d, e View Figure 24 ) Paraglossa dorsally with three spine-like setae near inner, distolateral margin. Labial palp with segment I 0.8 × length of segments II and III combined. Segment II with narrow thumb-like distomedial protuberance, slightly bent distad (protuberance somewhat varying), dorsally with one spine-like seta near outer, distolateral margin. Segment III oblong, apically rounded, ~ 0.9 × length of segment II. Otherwise, as typical for the genus.

Thorax. Sterna without protuberances.

Terga. Without long setae on midline; without protuberances.

Legs (Fig. 25 a – f View Figure 25 ). Ratio of leg segments: fore leg 1.1: 1.0: 0.3: 0.1, middle leg 1.2: 1.0: 0.3: 0.1 and hind leg 1.2: 1.0: 0.3: 0.2. Femur. Length ~ 3.6 × maximum width. Surface rough in brown areas. Tarsus. With regular row of medium, apically rounded setae along outer margin, similar as on tibia, but much shorter. Claw with one row of 9–11 denticles; one posterior seta. Otherwise, as typical for subgenus.

Abdomen. Terga (Fig. 25 g, h View Figure 25 ). Abdominal terga without long, fine setae on midline, without median or submedian elevations or protuberances. Surface of abdominal terga rough, with numerous short sensillae, without scattered fine simple setae. Posterior margins of abdominal terga: I smooth, without denticles, II – IX with very small, triangular, apically rounded, dark brown denticles.

Tergalii (Fig. 24 h, i View Figure 24 ). Present on abdominal terga II – VII; long and narrow. Tracheae and pigmentation well-developed, reaching margins; ribs with very small, irregularly situated denticles on dorsal side. Tergalius II as long as terga III and IV combined; tergalius IV as long as terga V, VI, and ½ VII combined; tergalius VII as long as terga VIII, IX, and ½ X combined.

Paraproct (Fig. 25 i View Figure 25 ). Without posterior prolongation; with small spines on posterior margin.

Caudalii (Fig. 25 j, k View Figure 25 ). Cerci without swimming setae. Paracercus with 17 or 18 segments.

Pose of subimaginal gonostyli under larval cuticle. Unknown.

Subimago (Fig. 27 c – i View Figure 27 ). Body length 3.6–4.1 mm. Turbinate eyes of male ochre. Thorax pale brown. Wing membrane colourless, veins pale brown, microtrichia pale brown. Legs very pale brown; femur anteriorly with hypodermal, shoe-shaped, dark brown marking in basal ½; femur posteriorly with hypodermal, dark brown distal streak. Abdomen of female pale brown; male with abdominal segments I and VII – X pale brown, II – VI nearly colourless; both sexes with hypodermal, sublateral, transvers, dark brown short streaks on posterior margin of terga I – VII. Cerci colourless.

Texture (Fig. 27 h, i View Figure 27 ). On all legs of male and female subimagos, terminal tarsomere covered with pointed microlepides only; other tarsomeres covered mostly with blunt microlepides, with pointed microlepides near apex.

Imago, male (Figs 26 a – d View Figure 26 , 27 a, b View Figure 27 ). Body length ~ 3.8 mm. Head pale brown, antennae pale brown, turbinate eyes pale brown, wide, with facetted surfaces round. Thorax pale brown to brown. Fore wing with membrane colourless, veins pale brown, base of RA and costal brace brownish. Pterostigma with two or three oblique crossveins, basalmost crossvein nearly complete, others incomplete. Legs brownish; femur with hypodermal, dark brown, shoe-shaped macula in basal ½ of anterior side; femur on posterior side distally with hypodermal, dark brown streak. Abdominal segments I and VII – X pale brown, II – VI nearly colourless; with hypodermal, dark brown, short, sublateral, transvers streaks on posterior margin of terga I – VII. Cerci colourless.

Genitalia (Fig. 27 b View Figure 27 ). Unistyliger slightly widened apically, with median and lateral margins slightly convex. Gonostylus with segment I on lateral and median side convex and separated from segment II by concavity. Segment II almost equally wide and straight all over its length. Terminal segment III slightly wider than segment II, cube-like. Penial bridge with poorly expressed membranous projection between unistyligers.

Imago, female. Unknown.

Egg (Fig. 28 a – d View Figure 28 ). Elongate ovoid. Chorion entirely covered with ridges forming a net-like relief.

Comparison.

The larva of Papuanatula ( Papuafiliola) longabranchias sp. nov. is hardly different from Papuanatula ( Papuafiliola) stenophylla Kaltenbach, Kluge & Gattolliat, 2025 : P. longabranchias sp. nov. with hypodermal marking on anterior side of femur shoe-shaped, usually longer than wide (Fig. 23 d View Figure 23 ); no short, fine, simple setae on surface of abdominal tergites (Fig. 25 h View Figure 25 ); paracercus with 17 or 18 segments (Fig. 25 j View Figure 25 ). P. stenophylla with hypodermal marking on anterior side of femur usually like a band, wider than long; scattered short, fine, simple setae on surface of abdominal terga; paracercus with ~ 15 segments ( Kaltenbach et al. 2025: figs 132 a, b, 135 d). However, male imagos are clearly different: P. longabranchias sp. nov. has pale brown turbinate eyes (Fig. 26 a, b View Figure 26 ), whereas P. stenophylla has dull-red turbinate eyes ( Kaltenbach et al. 2025: fig. 137 a, d). The eggs of both species are identical (Fig. 28 a – d View Figure 28 ; Kaltenbach et al. 2025: fig. 138 a).

Biological aspects.

The species is known from two watercourses in southern Batanta: Kalijakut (Fig. 29 d View Figure 29 (type locality), f) and Tanjung Lampu Rivers at elevations from 182– 420 m. It co-occurs with larvae of P. batanlenos sp. nov. and P. cukiclara sp. nov.

Etymology.

The species name longabranchias , meaning “ long gills ” in Latin, refers to the very long and slender shape of the tergalii.

Distribution.

New Guinea, Batanta Island (Fig. 30 View Figure 30 ).