Papuanatula (Papuanatula) plana Lugo-Ortiz & McCafferty 1999
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 plana

description: Papuanatula (Papuanatula) plana Lugo-Ortiz & McCafferty, 1999
Figs 17, 18, 19, 20, 21, 22, 23, 24
Papuanatula plana. Lugo-Ortiz and McCafferty 1999: 66–68, figs 25–30.
Material examined.
Type locality (‘ additional material’ in original description). Papua New Guinea • 5 larvae; Morobe Prov., E of Wau, Bulolo Riv.; 900 m; 15. x. 1964; leg. WL and WG Peters; 3 in alcohol; GBIFCH 00976075, GBIFCH 00976051; 2 on slides; GBIFCH 00592549, GBIFCH 00592582; 22 male adults; 20 in alcohol; GBIFCH 00976071, GBIFCH 00976052; 2 on slides; GBIFCH 00592550, GBIFCH 01221756; MZL.
Diagnosis.
Larva. The following combination of characters distinguishes P. plana from other species of Papuanatula s. str.: body dorsally without row of long, fine, simple setae along midline; body dorsally without protuberances; femur without distinct markings; abdominal segment IV with dark brown, medioposterior mark; paracercus with 9 segments.
Description.
Larva (Figs 17 – 22). Body length 3.7–4.1 mm, cerci much longer than body length.
Coloration (Fig. 17 a – c). Description see Lugo-Ortiz and McCafferty (1999: 66–67).
Head. Antenna (Fig. 17 a). Length 1.5 × head length. As typical for the subgenus. Developing turbinate eyes in last instar male larva (Fig. 20 e) large, subquadrangular, nearly touching each other in the middle. Labrum (Fig. 18 a, b). Length 0.5 × maximum width, laterally convex. Dorsal, sub-marginal arc with ~ 14 feathered setae. Right mandible (Fig. 18 d, e). Margin between prostheca and mola with row of minute denticles. Otherwise, as typical for subgenus. Left mandible (Fig. 18 f, g). Margin between prostheca and mola with row of minute denticles. Otherwise, as typical for subgenus. Hypopharynx (Fig. 18 c). As typical for genus. Maxilla (Fig. 19 c, d). Maxillary palp slightly longer than galea-lacinia, robust; palp segment II subequal in length to segment I. Otherwise, as typical for genus. Labium (Fig. 19 a, b). As typical for the genus. Paraglossa dorsally with two spine-like setae near inner, distolateral margin. Labial palp with segment I subequal in length to segments II and III combined. Segment II with slight, broadly rounded, distomedial protuberance, dorsally with row of three spine-like setae near outer, distolateral margin. Segment III slightly pentagonal, pointed, 0.8 × 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 without protuberances. Legs (Fig. 20 a – d). Ratio of leg segments: fore leg 0.9: 1.0: 0.4: 0.2, middle leg 0.9: 1.0: 0.3: 0.2 and hind leg 1.0: 1.0: 0.4: 0.2. Femur. Length ~ 3 × maximum width. Claw with one row of 5–8 denticles, distalmost denticle with distance to other denticles; one posterior seta.
Abdomen. Terga (Figs 21 a, 22 a – d). Abdominal terga without protuberances. Posterior margin of terga: I and II smooth, without denticles; III – IX with triangular, pointed denticles, increasing in length toward VII. Surface with scattered small, sub rectangular, apically rounded scales. Tergalii (Fig. 21 e). Narrow-elongate, tracheation absent or poorly developed; margins smooth, with short, fine, simple setae. Paraproct (Fig. 21 d). Posterior margin without prolongation, smooth. Caudalii (Fig. 21 b, c). Cerci without swimming setae. Paracercus with nine segments.
Pose of subimaginal gonostyli under larval cuticle (Fig. 21 f). As typical for the subgenus. Segment III conical.
Subimago. Unknown.
Male and female imagos. See description in Lugo-Ortiz and McCafferty (1999: 67, figs 31, 32).
Imago, male (Figs 23 a, b, 24 a, b). Head and thorax yellow-brown; legs pale yellow-brown. Turbinate eyes widened apically. Fore wings marginally with double intercalary veins. Pterostigma with four mostly incomplete, oblique cross veins. Hind wings absent. Abdominal segments I – VI translucent, abdominal tergum IV posteromedially with dark brown marking similar to larvae; abdominal segments VII – X pale yellow-brown.
Genitalia (Fig. 24 c). Sterno-styligeral muscle absent. Each unistyliger parallel-sided, equally wide at base and at apex. Gonostylus 1 st segment roundly-convex at apex, gradually turning to 2 nd segment. Second segment equally wide along its length. Third (terminal) segment of gonostylus nearly as wide as 2 nd segment, with length ~ 1.5 × width. Penial bridge with slightly truncated trapezoid projection between unistyligers.
Egg. Unknown.
Comparison.
The most similar species is P. obscurella sp. nov., a detailed comparison is given under this species.
Distribution.
New Guinea (Fig. 146).
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