Papuanatula (Papuafiliola) tuberculata 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 tuberculata

description: Papuanatula (Papuafiliola) tuberculata sp. nov.
Figs 138, 139, 140, 141, 142, 143, 144, 145
Etymology.
The species name tuberculata refers to the unpaired tubercles on abdominal terga of the larva (Fig. 138 c).
Material examined.
Holotype. L-S-I ♀ {specimen number [V] (2) 2012}; Indonesia • Papua, Baliem valley, Wamena, river Elagaima; 16. viii. 2012; coll. N. Kluge & L. Sheyko; SPbU. Paratypes. Same locality and collectors; 15–19. viii. 2012: 2 larvae; SPbU.
Diagnosis.
Larva. The following combination of characters distinguishes P. tuberculata sp. nov. from the other species of Papuafiliola subgen. nov.: absence of brown hypodermal maculae on femora and abdomen; presence of median protuberances on abdominal terga; tergalii rather wide.
Description.
Larva (Figs 138 – 142). Cuticular coloration. Head, pronotum and mesonotum mostly pale brownish, with some paler areas. Fore protopteron pale brownish, with narrow paler lines along concave veins (Fig. 139 a, c). Metanotum darker brownish medially, colorless laterally. Thoracic pleura pale brownish, sterna 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 (Figs 139 b, 141 a, b). Abdominal terga mostly pale brownish, with lateral areas paler or colorless; tergum VI more or less paler than others; sterna colorless (Figs 138, 139 d). Cerci uniformly pale brownish.
Hypodermal coloration. Not expressed (at least in penultimate larval instar). Tissues surrounding tracheae of tergalii (main trachea and its branches) with brown pigmentation (Fig. 142 d, e).
Head. Antenna (Fig. 142 c) with each flagellomere symmetric, cylindrical. Developing turbinate eyes in last instar male larva. Unknown. Labrum (Fig. 140 a) short and widest at base; long setae on dorsal surface simple (not branched), constitute two pairs: submedian pair and one more pair laterad of them. Right mandible (Fig. 140 c) short, with incisor not elongated; incisor terminating with four denticles, among which most distal denticle shorter than others; other three denticles subequal; mola with seta on proximal corner. Left mandible (Fig. 140 b) short, with incisor not elongated; incisor terminating with four denticles, among which most distal denticle shorter than others; other three denticles subequal; mola with seta on proximal corner. Hypopharynx (Fig. 140 f, g) with bunch of long, straight, stout, setae-like spines situated on common projection. Maxilla (Fig. 140 d, e) short and wide; maxillary palp 2 - segmented, as long as galea-lacinia. Labium (Fig. 140 h – j). Paraglossae widest at base, lateral side with slight concavity near base; three apical setal rows parallel to apical-lateral margin only (not bent parallel to median margin). 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; without protuberances. Metanotum without hind protoptera or their vestiges. Legs (Figs 139 b, 141 a, b). 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 8–10 subequal denticles and with long, arched seta on posterior side.
Abdomen. Terga (Figs 138, 139 d, 142 a) without long setae on midline (e. g., in contrast to P. obscura sp. nov.). Each abdominal tergum I – IX with slightly expressed median ridge elevating toward posterior margin. Surface of abdominal terga serrate, with numerous short sensilla; posterior margins of abdominal terga II – X with very small, blunt, dark brown denticles. Abdominal sterna without serrations and denticles. Tergalii (Fig. 142 d, e) of abdominal segment I absent; tergalii II – VII subequal, oval. Each tergalius with anal rib longer than costal rib; ribs with very small, irregularly situated denticles on dorsal side. Paraproct (Fig. 142 b) with many small, equal denticles on median and posterior margins, without posterior prolongation. Caudalii (Fig. 139 d). Cerci without swimming setae. Paracercus short, consisting of ~ 12 segments.
Pose of subimaginal gonostyli under larval cuticle. Unknown.
Subimago. Cuticular coloration. Pronotum partly brownish. Mesonotum pale brown with medioparapsidal suture colorless, other sutures darker brown (Fig. 143 a). Meso- and metathoracic pleura and sterna with colorless, pale brownish and dark brown areas (Fig. 143 b). Cuticle of wings colorless, with microtrichiae brownish. Legs nearly colorless, with pale brown bordering on femur and base of tibia (as in Fig. 36 d). Abdomen very pale brownish. Cerci colorless with setae brownish.
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 (Fig. 143 c, d).
Imago. Imago, male. Unknown.
Imago, female (Fig. 144 a – f). Head ochre with brown. Antennae ochre, distal parts of scapus and pedicellum brown. Thorax brown with ochre, equally dark dorsally, laterally, and ventrally. Fore wing with membrane mostly colorless, veins pale ochre; base of wing, including costal brace contrastingly pigmented with brown and ochre. Pterostigma with three or four oblique, incomplete cross veins (Fig. 144 f). Legs ochre; femur of each leg with wide reddish-brown band in distal part; femur of fore leg, besides this, with longitudinal reddish-brown macula occupying most part of proximal 1 / 2 (Fig. 144 c – e). On each leg, tarsus with two apical spines: on 2 nd and 3 rd tarsomeres on fore leg, on 1 st + 2 nd and 3 rd tarsomeres on middle and hind legs. Each abdominal tergum I – IX brown with paler ochre areas; tergum X brownish ochre; sterna ochre (Fig. 144 a, b). Cerci pale ochre.
Egg (Fig. 145 a – e). Elongate oval. Chorion entirely and evenly covered with ridges forming a net-like relief.
Dimension.
Fore wing length of female (and approximate body length) 50 mm.
Comparison.
Larva of Papuanatula (Papuafiliola) tuberculata sp. nov. differs from P. (Papuafiliola) stenophylla sp. nov. by absence of brown hypodermal maculae on femora and abdomen, presence of median protuberances on abdominal terga and wider tergalii. Imago of P. (Papuafiliola) tuberculata sp. nov. differs from P. (Papuafiliola) stenophylla sp. nov. by absence 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