Papuanatula ( Papuafiliola ) horvathrobi Kovács, Kaltenbach & 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.17574137
persistent identifier	https://treatment.plazi.org/id/A884DA10-6BD1-50DA-ABC5-47E8FAF2D79D
treatment provided by	ZooKeys by Pensoft
scientific name	Papuanatula ( Papuafiliola ) horvathrobi Kovács, Kaltenbach & Gattolliat
status	sp. nov.

Treatment

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

Figs 20 View Figure 20 , 21 View Figure 21 , 22 View Figure 22

Type material.

Holotype. Indonesia • larva; West Papua, Batanta Island, Waibin River ; between 00°49'21"S, 130°45'57"E and 00°50'02"S, 130°45'25"E; 20 m – 45 m; 05. ii. 2024; leg. T. Kovács; on slide; GBIFCH 00975876 ; 2024-9, EPHTYP-16; MM GoogleMaps . Paratypes. 1 larva; same data as holotype; on slide; GBIFCH 00975913 ; MZL GoogleMaps • 1 larva; West Papua, Batanta Island, Warai Stream ; between 00°50'51"S, 130°35'14"E and 00°51'12"S, 130°35'20"E; 225 m – 315 m; 21. ii. 2024; leg. T. Kovács; on slide; GBIFCH 00975877 ; MZL GoogleMaps • West Papua, Batanta Island, Waridor River ( shallow, rocky, fast-flowing); 00°52'06"S, 130°31'30"E; 32 m; 14. ii. 2025; leg. T. Kovács; 4 in alcohol; GBIFCH 01582003 ; MZL; 12 in alcohol; 2025-12, EPHTYP-17; MM GoogleMaps .

Diagnosis.

Larva. The following combination of characters distinguishes P. horvathrobi sp. nov. from other species of Papuanatula ( Papuafiliola) : thorax and abdomen dorsally without protuberances; femur with large blank in posterior ⅔; femur and abdomen without brown hypodermal maculae; tergalii oblong; paracercus with 15 segments.

Description.

Larva (Fig. 20 View Figure 20 – 22 View Figure 22 ). Body length ~ 3.0 mm, cerci ~ 1.4 × body length.

Cuticular coloration (Figs 20 a, b View Figure 20 , 22 a View Figure 22 ). Head, thorax, and abdomen dorsally brown. Head, thorax and abdomen ventrally beige. Legs brown, femur with large blank in posterior ⅔, and distally with small blank area. Caudalii light brown.

Hypodermal coloration (Fig. 20 a, b View Figure 20 ). Head, thorax, abdomen, and legs without hypodermal markings.

Head. Antenna. Length ~ 2.5 × head length. Otherwise, as typical for the subgenus.

Developing turbinate eyes in last instar male larva (Figs 20 a View Figure 20 , 21 j View Figure 21 ) large, roundish, with some distance to each other.

Labrum (Fig. 21 a, b View Figure 21 ). Length 0.6 × maximal width. With reduced, submarginal arc of three long, simple setae. Otherwise, as typical for subgenus.

Right mandible (Fig. 21 d View Figure 21 ). 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, with few minute denticles. Otherwise, as typical for subgenus.

Left mandible (Fig. 21 c View Figure 21 ). Incisor with five denticles, kinetodontium with three denticles; margin between prostheca and subtriangular process straight, with minute denticles. Otherwise, as typical for subgenus.

Hypopharynx (Fig. 21 f View Figure 21 ) with well-developed tuft of long, spine-like setae. Otherwise, as typical for the genus.

Maxilla (Fig. 21 g View Figure 21 ). Maxillary palp slightly longer than galea-lacinia; segment I 1.4 × length of segment II. Otherwise, as typical for the genus.

Labium (Fig. 21 e View Figure 21 ) Paraglossa dorsally with three spine-like setae near inner, distolateral margin. Labial palp with segment I 0.7 × length of segments II and III combined. Segment II with narrow thumb-like distomedial protuberance, slightly bent distad, dorsally with one spine-like seta near outer, distolateral margin. Segment III oblique conical, apically rounded, approx. as long as segment II. Otherwise, as typical for the genus.

Thorax. Sterna without protuberances.

Terga. Without long setae on midline; without protuberance.

Legs (Fig. 22 a – d View Figure 22 ). 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 1.5: 1.0: 0.4: 0.2. Femur. Length ~ 3 × maximum width. Surface of brown areas with minute denticles. Tarsus. With regular row of medium, apically rounded setae along outer margin. Claw with one row of 11 denticles; one posterior seta. Otherwise, as typical for subgenus.

Abdomen. Terga (Fig. 22 e, f, j View Figure 22 ). Abdominal terga without long setae on midline; abdominal terga without median or submedian elevations or protuberances; surface with minute denticles. Posterior margins of abdominal terga: I smooth, without denticles, II – IX with very small, triangular denticles.

Tergalii (Fig. 21 h, i View Figure 21 ). Present on terga II – VII, oblong; tracheation well-developed, pigmentation not reaching margins. Each tergalius with anal rib longer than costal rib; ribs with minute, irregularly situated denticles on dorsal side. Tergalius II as long as terga III and ⅔ IV combined, tergalius IV as long as terga V and ⅔ VI combined, tergalius VII as long as terga VIII and ⅔ IX combined.

Paraproct (Fig. 22 g View Figure 22 ) without posterior prolongation. Posterior margin with small denticles.

Caudalii (Fig. 22 h, i View Figure 22 ). Cerci without swimming setae. Paracercus with 15 segments.

Pose of subimaginal gonostyli under larval cuticle unknown.

Subimago. Unknown.

Imago. Unknown.

Egg. Unknown.

Biological aspects.

The species is known from three watercourses in the northern part of Batanta (Waibin River (type locality), Waridor River, and Warai Stream), at altitudes from 20– 315 m. The largest numbers were collected at a ford of the Waridor River at an altitude of 32 m (Fig. 29 e View Figure 29 ), where P. batanlenos sp. nov., was also present in large numbers.

Etymology.

The new species is dedicated to Róbert Horváth, a Hungarian ornithologist, who initiated and organized the Hungarian research program on Biodiversity in Batanta in 2010. Since then, he gave continuous support in various aspects of the ten research trips conducted to date.

Distribution.

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