Papuanatula (Papuanatula) webbi Kaltenbach, Kluge & Gattolliat, 2025, sp. nov.
Creators: name: Kaltenbach, Thomas
name: Kluge, Nikita J.
name: Gattolliat, Jean-Luc
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Ephemeroptera
Baetidae
Papuanatula
Papuanatula webbi

description: Papuanatula (Papuanatula) webbi sp. nov.
Figs 121, 122, 123, 124, 125, 126
Etymology.
The species is dedicated to Jeff Michael Webb (Rhithron Associates, USA), who was contributing to this study in an early phase.
Material examined.
Holotype. Indonesia • larva; Papua Barat, Kebar to Aibogar, slow forest stream; 00°51'45"S, 132°49'48"E; 503 m; 04. xi. 2013; leg. M. Balke: (BH 025); on slide; GBIFCH 01221788; MZB. Paratypes. 16 larvae; same data as holotype; 2 on slide; GBIFCH 01221798, GBIFCH 01221790, GBIFCH 01221804; MZL; 14 in alcohol; GBIFCH 00975827, GBIFCH 00975834, GBIFCH 00975835, GBIFCH 00975837, GBIFCH 00975838, GBIFCH 00975840, GBIFCH 00975844, GBIFCH 00975901; MZL.
Diagnosis.
Larva. The following combination of characters distinguishes P. webbi sp. nov. from other species of Papuanatula s. str.: body dorsally without row of long, fine, simple setae along midline; pronotum with pair of small, triangular, apically rounded protuberances near medioposterior margin; fore protoptera with pair of minute protuberances at medioposterior margin; metanotum and abdominal terga I – IX posteromedially with small to medium protuberance, oriented dorsoposteriad; femur with subquadrangular blank in basal area and long, narrow blank along dorsal margin; paracercus with eight segments.
Description.
Larva (Figs 121 – 126). Body length 2.4–3.2 mm, cerci much longer than body length (~ 1.5 ×).
Cuticular coloration (Fig. 121 a – c). Head, thorax and abdomen dorsally brown. Femur grey-brown, with subquadrangular blank in basal area, long, narrow blank along dorsal margin and rounded blank in distal area; tibia and tarsus ecru, in medial area grey-brown. Head, thorax and abdomen ventrally pale brown, protuberances of thoracic sterna brown, abdominal segments II – VIII slightly darker than thorax. Cerci yellow-brown.
Hypodermal coloration (Fig. 121 a, b). Abdominal terga I – IX with narrow, dark brown transverse band close to posterior margin.
Head. Antenna (Fig. 121 a – c). Length 1.5 × head length. As typical for subgenus. Developing turbinate eyes in last instar male larva (Fig. 123 e) rather large, but with distance to each other. Labrum (Fig. 122 a). Relatively small, length 0.5 × maximum width, laterally slightly convex. Dorsal, sub-marginal arc with ~ 10 feathered setae. Right mandible (Fig. 122 c, d). Margin between prostheca and mola with row of minute denticles. Otherwise, as typical for subgenus. Left mandible (Fig. 122 e, f). Margin between prostheca and mola with few minute denticles. Otherwise, as typical for subgenus. Hypopharynx (Fig. 122 b). As typical for genus. Maxilla (Fig. 123 c, d). Maxillary palp subequal in length to galea-lacinia; palp segment II ~ 1.7 × length of segment I. Otherwise, as typical for genus. Labium (Fig. 123 a, b). As typical for the genus. Paraglossa dorsally with two spine-like setae near inner, distolateral margin. Labial palp with segment I ~ 1.2 × length of segments II and III combined. Segment II without distomedial protuberance, dorsally with row of four spine-like setae near outer, distolateral margin. Segment III conical, pointed, 0.7 × length of segment II.
Thorax. Sterna. With small protuberances on sides of prosternum and close to openings of mesothoracic and metathoracic sternal apodemes (as in Fig. 108 a). Terga (Figs 124 f – I, 126 a). Pronotum with pair of small, triangular, apically rounded protuberances near posteromedial margin; metanotum posteromedially with small, apically rounded protuberance. Fore protoptera with pair of minute protuberances at medioposterior margin. Hind protoptera (Fig. 124 g). Absent, but sometimes with vestiges. Legs (Fig. 124 a – e). Ratio of leg segments: fore leg 0.9: 1.0: 0.3: 0.1, middle leg 0.9: 1.0: 0.3: 0.1 and hind leg 1.0: 1.0: 0.4: 0.2. Femur. Length ~ 3 × maximum width. Claw with one row of six denticles; one posterior seta.
Abdomen. Terga (Figs 125 a, b, 126 b – d). Terga I – IX posteromedially with small to medium, apically rounded protuberance, oriented dorsoposteriad. Posterior margin of terga: I – III smooth, without denticles; IV – IX with short, rounded denticles, apically carrying minute, fine, acute spines. Surface with scattered small, spoon-shaped, striated scales. Tergalii (Fig. 125 f). Narrow oblong, tracheation with strongly developed trunk, other tracheation poorly developed; margins smooth, with few short, fine, simple setae. Paraproct (Fig. 125 e). Posterior margin with prolongation and row of minute denticles. Caudalii (Fig. 125 c, d). Cerci without swimming setae, in middle part one or two insertions per segment still visible, and sometimes with a short, rudimentary swimming seta. Paracercus with eight segments.
Pose of subimaginal gonostyli under larval cuticle. Unknown.
Subimago. Unknown.
Imago. Unknown.
Egg. Unknown.
Distribution.
New Guinea (Fig. 148).
description: Published as part of Kaltenbach, Thomas, Kluge, Nikita J. & Gattolliat, Jean-Luc, 2025, Redescription of Papuanatula Lugo-Ortiz & McCafferty (Ephemeroptera, Baetidae), with description of a new subgenus and 20 new species, pp. 159-347 in ZooKeys 1227 on pages 159-347, DOI: 10.3897/zookeys.1227.138100