Papuanatula (Papuanatula) zebrata 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 zebrata

description: Papuanatula (Papuanatula) zebrata sp. nov.
Figs 127, 128, 129, 130, 131
Etymology.
The species name zebrata refers to the hypodermal coloration of larval abdomen (and probably that of winged stages) which includes contrasting, dark brown transverse bands on posterior margins of terga (Fig. 127 a, d).
Material examined.
Holotype. Male larva ready to molt to subimago; INDONESIA • Papua, Baliem valley, Wamena, river Elagaima; 15–19. viii. 2012; coll. N. Kluge & L. Sheyko; SPbU. Paratypes. same data as holotype, 25 larvae; SPbU.
Diagnosis.
Larva. The following combination of characters distinguishes P. zebrata sp. nov. from other species of Papuanatula s. str.: body without row of long, fine setae along midline; abdominal terga without protuberances; femur with brown, hypodermal streak in basal 1 / 2 and brown spot in distal area; tergalii colorless; posterior margin of abdominal terga with heterogenous, sharply pointed denticles.
Description.
Larva (Figs 127 – 130). Cuticular coloration. Head, pronotum, mesonotum and metanotum ochre with brownish areas; fore protoptera nearly uniformly ochre (Fig. 127 a). Thoracic pleura brownish, sterna mostly colorless. Cuticle of femur with brownish margins and large blank occupying most part of proximal 1 / 2 (Fig. 129 c – f). Tibia and tarsus mostly ochre (Fig. 129 c – f). Abdominal terga brownish with paler blanks; each tergum VI – IX with median blank and pair of brown sigilla inside it. Sterna mostly colorless (Fig. 127 b). Cerci uniformly pale brownish.
Hypodermal coloration. Anterior side of each femur with roundish or longitudinal, dark brown macula on proximal 1 / 2; posterior side of each femur with or without brown macula on distal 1 / 2 (Fig. 129 c – f). Each abdominal tergum I – IX with contrasting, dark brown band on posterior margin; some terga also with pair of brown spots (Fig. 127 d). Tissues surrounding tracheae of tergalii either with brown pigmentation (Fig. 127 b), or without pigmentation, so that tracheae poorly visible (Fig. 127 a).
Head. Antenna (Fig. 130 a). Length ~ 2 × head length. As typical for subgenus. Developing turbinate eyes in last instar male larva with facets equally developed on middle and periphery areas (as in Fig. 32 d). Labrum (Fig. 128 a) slightly widened distally; long setae on dorsal surface forming regular transverse row; each seta pointed, with moderately long processes on both sides. Right mandible (Fig. 128 e, f). Incisor with indistinct denticles near base; kinetodontium slightly separated from incisor and terminated with three denticles, with distal denticle longest. Left mandible (Fig. 128 d). Incisor and kinetodontium non-distinguishable, together with three small denticles proximad of stretched apex of incisor. Hypopharynx (Fig. 128 h) apically with pair of fields of stout, short, setae-like spines on apex. Maxilla (Fig. 128 g). Maxillary palp as long as galea-lacinia. Otherwise, as typical for genus. Labium (Fig. 128 b, c). Paraglossae widest at base and narrowing toward apex; three apical setal rows bent at apex of paraglossa. Glossa shorter than half of paraglossa, with finger-like (distal) portion as long as triangular (proximal) portion. Glossa with several long setae in distal 1 / 2 and one long seta near middle of ventral side. Labial palp without distomedian projection on segment II; segment III with median margin as long as lateral margin.
Thorax. Sterna without protuberances. Terga without protuberances. Metanotum without hind protoptera or their vestiges. Legs (Fig. 129 a – f). Fore femur widened in proximal part; hind tibia shorter than others. Femur. Outer side of each femur with single regular row of long, hair-like setae bearing numerous fine, short branches on all sides (Fig. 129 c – f, as in Figs 41 g, 68 b). Tibia. Patella-tibial suture present on all legs, terminated near middle of inner margin of tibia (Fig. 129 c – f). Tibia-tarsal condylus turned to anterior side. Anterior side of each tibia with regular row of hair-like setae similar to setae on femur, but smaller (Fig. 129 c – f). Tarsus. Anterior side of each tarsus with regular row of similar, but smaller setae (Fig. 129 b). Posterior side of each tarsus with regular row of stout setae; two or three most distal of them elongated and pointed; most distal seta longer than others (but with shape and thickness similar to previous one) (Fig. 129 a). Claw with row of 4–6 denticles and one somewhat larger denticle distad of them; long, arched, posterior seta (Fig. 129 b).
Abdomen. Terga (Figs 127 b, 130 b, c) without long setae on midline. Abdominal terga without dorsal unpaired or paired protuberances, only with slightly expressed, unpaired, median elevations. Abdominal terga I – III without denticles or with few denticles on posterior margins; posterior margins of abdominal terga IV – IX with conical, sharply pointed denticles irregularly alternated with smaller pointed denticles. Posterior margin of tergum X mostly smooth, with few pointed denticles on sides. Tergalii (Fig. 127 a, b) of abdominal segment I absent; tergalii II – VII subequal, oval. Each tergalius with costal and anal ribs narrow, smooth, present on proximal 1 / 2 of tergalius only (as in Fig. 66 i). Paraproct without posterior prolongation; margins membranous, smooth, lacking denticles. Caudalii (Fig. 127 a, b) without swimming setae or their vestiges. Paracercus short, consisting of ~ 8–10 segments.
Pose of subimaginal gonostyli under larval cuticle (Fig. 131 b). In mature larva ready to molt to subimago, subimaginal gonostyli packed under larval cuticle in “ Labiobaetis - type ” pose: 2 nd segments directed medially and bent proximally; 3 rd segment directed medially (as continuation of 2 nd segment) and narrowed apically, being deformed corresponding to space between subimaginal styliger and larval cuticle.
Subimago. Cuticular coloration. Pronotum and mesonotum on Fig. 131 a.
Texture. On all legs of both sexes, each tarsomere covered mostly with blunt microlepides, with pointed microlepides near apex (as in Fig. 70 i).
Imago. Unknown. Judging from larval hypodermal coloration and identical hypodermal coloration of male and female larvae ready to molt to subimago, imagines of both sexes have following features: Femur of each leg pair with two dark brown maculae, one on proximal 1 / 2 and another on distal 1 / 2. Each abdominal tergum I – IX with contrasting, dark brown band on posterior margin; some terga also with pair of brown spots (as in Fig. 127 d). Judging from fully developed facetted surface of turbinate eyes in larva, male imaginal turbinate eyes are widened distally and have wide facetted surfaces.
Egg. Unknown.
Dimension.
Body length 4–5 mm.
Comparison.
Larva of the new species P. (Papuanatula) zebrata sp. nov. has similarities with P. lenos in absence of long hairs and denticles on abdominal terga and presence of brown hypodermal maculae on femora; P. zebrata sp. nov. differs from P. lenos by absence of special brown markings on abdominal terga IV, VII and VIII, sharper and heterogeneous denticles on posterior margins of abdominal terga and colorless tracheae of tergalii.
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