Papuanatula (Papuafiliola) stenophylla 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 stenophylla

description: Papuanatula (Papuafiliola) stenophylla sp. nov.
Figs 132, 133, 134, 135, 136, 137
Etymology.
The species name stenophylla (from στενος — slender, and φυλλον — leaf) refers to theslender tergalii.
Material examined.
Holotype. L-S / I ♂ {specimen number [XX] (5) C 2012}; Indonesia • Papua, Depapre; 28. viii. 2012; coll. N. Kluge & L. Sheyko; SPbU. Paratypes. Same locality and collectors; 25–28. viii. 2012: 2 S ♂, 11 larvae; SPbU.
Diagnosis.
Larva. The following combination of characters distinguishes P. stenophylla sp. nov. from the other species of Papuanatula (Papuafiliola): femora and abdomen with brown hypodermal maculae; without median protuberances on abdominal terga; tergalii narrow.
Description.
Larva (Figs 132 – 136). Cuticular coloration. Head, pronotum and mesonotum mostly pale brownish, with some paler areas. Fore protopteron nearly uniformly pale brownish (Fig. 133 b, e). Metanotum darker brownish medially, colorless laterally. Thoracic pleura pale brownish, sterna mostly colorless. Cuticle of legs mostly colorless, with brownish outer margin and two brownish transverse bands on anterior surface: one close to base and another in apical part; cuticle of these brownish areas serrate (Fig. 135 a, b). Abdominal terga mostly pale brownish; lateral areas of anterior terga paler or colorless; sterna colorless (Fig. 133 c). Cerci uniformly pale brownish.
Hypodermal coloration. Anterior side of each femur with wide, contrasting, dark brown macula in middle of area with non-pigmented cuticle (Fig. 136 a – c). Abdomen with sublateral, transverse, contrasting, dark brown maculae between terga (Fig. 132 a, b). Tissues surrounding tracheae of tergalii (main trachea and its branches) with extensive dark brown pigmentation (Fig. 136 d – k).
Head. Antenna (Fig. 133 b). As typical for subgenus, with each flagellomere symmetric, cylindrical. Developing turbinate eyes in last instar male larva (Fig. 133 a) with facets equally developed on middle and periphery areas. Labrum (Fig. 134 a) short and widest at base; long setae on dorsal surface simple (not branched), few (2–4 on each side) and irregularly situated. Right mandible (Fig. 134 c, e) short, with incisor not elongated; incisor terminating with 4 denticles, most distal denticle shorter than others; other three denticles subequal; mola with seta on proximal corner. Left mandible (Fig. 134 b, d) short, with incisor not elongated; incisor terminating with four denticles, most distal denticle shorter than others; other three denticles subequal; mola with seta on proximal corner. Hypopharynx (Fig. 134 g) with bunch of long, straight, stout, setae-like spines situated on common projection. Maxilla (Fig. 134 f) short and wide; maxillary palp 2 - segmented, as long as galea-lacinia. Labium (Fig. 134 h – j) Paraglossae widest at base, lateral side without concavity; three apical setal rows straight (not bent at apex of paraglossa). Glossa longer than half of paraglossa, with finger-like (distal) portion much longer than triangular (proximal) portion. Ventral side of glossa with several irregularly arranged setae both on triangular and finger-like portions. Labial palp with long, narrow, arched distomedian projection on segment II; segment III with median margin shorter than lateral margin.
Thorax. Sterna without protuberances. Terga. Without long setae on midline. Metanotum without hind protoptera or their vestiges. Legs (Figs 135 a – c, 136 a – c). Fore femur widened in proximal part; hind tibia shorter than others. Femur. Outer side of each femur with single regular row of long, slender, flattened, parallel-sided setae with blunt apices. Cuticle of anterior surface of each femur with serrate areas corresponding with brownish pigmentation (see above). Tibia. Patella-tibial suture present on all legs, terminated proximad of inner margin of tibia. Tibia-tarsal condylus turned to anterior side. Anterior side of each tibia with regular row of long, slender, flattened, parallel-sided setae with blunt apices, similar to that on femur, but shorter. Tarsus. Anterior side of each tarsus with regular row of similar, but shorter setae. Posterior side of each tarsus with regular row of few small, stout, pointed setae, most distal of which not longer or slightly longer than others. Claw with row of 9–11 subequal denticles and with long, arched seta on posterior side.
Abdomen. Terga (Figs 133 c, 135 d). Abdominal terga without long setae on midline. All abdominal terga smooth, without median or submedian elevations or protuberances. Surface of abdominal terga rough, with numerous short sensilla, without long setae; posterior margins of abdominal terga II – X with very small, blunt, dark brown denticles. Posterior margins of abdominal sterna without denticles. Tergalii (Fig. 136 d – k) of abdominal segment I absent; tergalii II – VII subequal, long and narrow. Each tergalius with anal rib longer than costal rib; ribs with very small, irregularly situated denticles on dorsal side. Paraproct (Fig. 133 g) with small, equal denticles on posterior margin, without denticles on median margin, without posterior prolongation. Caudalii (Fig. 133 d). Cerci without swimming setae. Paracercus short, consisting of ~ 15 segments.
Pose of subimaginal gonostyli under larval cuticle (Fig. 137 e). In mature larva ready to molt to subimago, subimaginal gonostyli packed under larval cuticle in “ Crassolus - type ” pose (Kluge et al. 2020; Kluge 2021): gonostylus shortened and bent in articulation of 2 nd and 3 rd segments; 2 nd segment directed caudally-medially and not bent; 3 rd segment directed medially-cranially and terminated mediad of 2 nd segment.
Subimago. Cuticular coloration (Fig. 137 d). Mesonotum very pale brownish with medioparapsidal sutures colorless, some sutures darker brownish. Thoracic pleura with brown and nearly colorless areas. Sterna nearly colorless. Wing membrane colorless, microtrichia brown. Legs nearly colorless; outer side of femur and base of tibia tinged with pale brownish. Abdomen very pale brownish, cerci colorless.
Hypodermal coloration. As in imago.
Texture. On all legs of female, terminal tarsomere covered with pointed microlepides only; other tarsomeres covered partly with pointed, partly with blunt microlepides (as in Fig. 143 c, d).
Imago. Imago, male (partly molted from subimago). Head ochre. Antennae ochre. Turbinate eyes dull-red, wide, with faceted surfaces round, contiguous. Thorax ochre, equally pale dorsally, laterally, and ventrally. Fore wing with membrane colorless, veins pale ochre, base of RA and costal brace colored with brownish. Pterostigma with 2–3 oblique, incomplete cross veins (Fig. 137 a). Legs ochre; femur of each leg with wide brownish band in distal part and with compact, oval, brown macula in proximal 1 / 2 (Fig. 137 c). On middle and hind legs, tarsus with 2 apical spines, on 1 st + 2 nd and 3 rd tarsomeres. Abdomen mostly whitish, terga VII – VIII pale ochre; each tergum I – VIII with pair of small, dark brown sublateral maculae on posterior margin (Fig. 137 b). Cerci pale ochre.
Shape of gonostyli unknown.
Imago, female. Unknown.
Egg (Fig. 138 a, b). Elongate oval. Chorion entirely and evenly covered with ridges forming a net-like relief.
Dimension.
Fore wing length of male (and approximate body length) 3.5 mm.
Comparison.
Larva of Papuanatula (Papuafiliola) stenophylla sp. nov. differs from P. (Papuafiliola) tuberculata sp. nov. by presence of brown hypodermal maculae on femora and abdomen, absence of median protuberances on abdominal terga and narrower tergalii. Imago of P. (Papuafiliola) stenophylla sp. nov. differs from P. (Papuafiliola) tuberculata sp. nov. by presence of brown hypodermal maculae on proximal part of middle and hind femora.
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