Papuanatula (Papuanatula) heterochaeta, Kaltenbach & Kluge & Gattolliat, 2025

Papuanatula (Papuanatula) heterochaeta sp. nov.

Figs 55 View Figure 55 , 56 View Figure 56 , 57 View Figure 57 , 58 View Figure 58 , 59 View Figure 59 , 60 View Figure 60 , 61 View Figure 61

Etymology.

The species name heterochaeta refers to the sharp difference between blunt-ended setae which form the longitudinal row on outer side of larval femur and small hair-like setae which form continuation of this row on apex of the femur (Fig. 58 a View Figure 58 ).

Material examined.

Holotype. L-S-I ♂ {specimen number [XX] (5) A 2012} Indonesia • Papua, Depapre ; 28. viii. 2012; coll. N. Kluge & L. Sheyko; SPbU . Paratypes. Same data as holotype; S-I ♂ (reared together with holotype, larval exuviae lost) ; same data as holotype; 25–28. viii. 2012; 1 S-I ♂, 10 larvae . Indonesia • Waena; 8–13. viii. 2012; coll. N. Kluge & L. Sheyko; 2 L-S ♀, S / I ♂, 6 larvae. All material in SPbU .

Diagnosis.

Larva. The following combination of characters distinguishes P. heterochaeta sp. nov. from other species of Papuanatula s. str.: body dorsally without irregular row of long, fine, simple setae along midline; abdominal terga without protuberances; hypopharynx apically with pair of bunches of setae-like spines (instead of one bunch as usually); femur with large, proximal, oval blank and with dark brown, shoe-shaped macula inside proximal blank; sharp difference between setae which form the longitudinal row on outer side of femur and setae which form continuation of this row on apex of femur; long, slender, preapical seta on tarsus absent; paracercus with ~ 10–12 segments.

Description.

Larva (Figs 55 View Figure 55 – 59 View Figure 59 ). Cuticular coloration. Head, pronotum, mesonotum and metanotum brownish with paler areas; fore protoptera with narrow paler lines corresponding to some longitudinal veins (Fig. 56 a, b View Figure 56 ). Thoracic pleura brownish, sterna mostly colorless. Cuticle of femur with brownish margins and brownish transverse band separating large proximal blank from smaller distal blank; proximal blank oval (not wedge-shaped), occupying most part of proximal 1 / 2 (Fig. 56 d – f View Figure 56 ). Tibia and tarsus mostly brownish (Fig. 56 d – f View Figure 56 ). Abdominal terga brownish with paler blanks; median blank on tergum VI larger than others. Sterna mostly colorless (Fig. 56 c View Figure 56 ). Cerci uniformly pale brownish.

Hypodermal coloration. Anterior side of each femur with dark brown shoe-shaped macula on proximal 1 / 2, within proximal cuticular blank (Fig. 55 f, g View Figure 55 ); posterior side of each femur with or without two longitudinal, brown maculae (Fig. 55 d View Figure 55 ), sometimes connected one with another (Fig. 55 b View Figure 55 ). Boundaries between abdominal terga narrowly bordered by dark brown; other brown markings on abdomen absent or present, most extensive on abdominal tergum IV (Fig. 55 a View Figure 55 ). Tissues surrounding tracheae of tergalii (main trachea and its branches) with brown pigmentation (Fig. 59 d – i View Figure 59 ).

Head. Antenna. As typical for subgenus. Developing turbinate eyes in last instar male larva with facets equally developed on middle and peripheric areas (as in Fig. 32 d View Figure 32 ). Labrum (Fig. 57 a, b View Figure 57 ) very slightly widened distally; long setae on dorsal surface spaced and forming regular transverse row; each seta pointed, with moderately long processes on both sides. Right mandible (Fig. 57 d, f View Figure 57 ). As typical for subgenus. Left mandible (Fig. 57 c, e View Figure 57 ). Incisor and kinetodontium non-distinguishable, together with 5 denticles proximad of stretched apex of incisor. Otherwise, as typical for subgenus. Hypopharynx (Fig. 57 j View Figure 57 ) apically with pair of bunches of stout setae-like spines. Maxilla (Fig. 57 g View Figure 57 ). Maxillary palps long as galea-lacinia. Otherwise, as typical for genus. Labium (Fig. 57 h, i View Figure 57 ). 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 at apex 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 long setae along midline. Metanotum without hind protoptera or their vestiges. Legs (Figs 56 d – f View Figure 56 , 58 a – f View Figure 58 ). Fore femur widened in proximal part; hind tibia shorter than others. Femur. Outer side of each femur with single regular row of long setae; each seta slender, flattened, narrowing toward apex and blunt apically, with numerous fine, short branches on all sides. Distally, close to femur-tibia articulation, setal row continued by several smaller, hair-like setae (similar to setae on tibia). Anterior side of femur with small, stout setae, sparsely and irregularly situated. Serrate area located at middle of anterior side, partly on brown transverse band, partly on proximal blank. Tibia. Patella-tibial suture present on all legs, terminated near middle of inner margin of tibia. Tibia-tarsal condylus turned to anterior side. Anterior side of each tibia with regular row of hair-like setae similar to setae near apex of femur. Tarsus. Anterior side of each tarsus with regular row of similar, but shorter (not narrower) setae. Long preapical seta absent; posterior side of each tarsus with regular row of few very short, stout setae and one longer, pointed seta of same thickness distad of them (Fig. 58 b, c View Figure 58 ). Claw with row of 6–9 denticles and one somewhat larger denticle distad of them; long, arched, posterior seta (Fig. 58 e, f View Figure 58 ).

Abdomen. Terga (Figs 56 c View Figure 56 , 59 a, b View Figure 59 ) without dorsal protuberances, only with slightly expressed, unpaired, median elevations; without long setae along midline. Abdominal terga with numerous small scales with small sockets and fan-like striation. Abdominal terga I – III without denticles on posterior margins; posterior margins of abdominal terga IV – IX with small, pointed denticles. Posterior margin of tergum X with very small denticles. Tergalii (Fig. 59 d – i View Figure 59 ) of abdominal segment I absent; tergalii II – VII subequal, oval, relatively narrow. Each tergalius with costal and anal ribs narrow, smooth, present on proximal 1 / 2 of tergalius only. Paraproct (Fig. 59 c View Figure 59 ). Margins membranous and smooth, lacking denticles. Caudalii (Fig. 59 c View Figure 59 ) without swimming setae or their vestiges. Paracercus short, consisting of ~ 10–12 segments.

Pose of subimaginal gonostyli under larval cuticle (Fig. 61 a View Figure 61 ). In mature larva ready to molt to subimago, subimaginal gonostyli packed under larval cuticle in “ Labiobaetis - type ” pose, as typical for the genus. 2 nd segment 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 prosternum partly brown (Fig. 60 f View Figure 60 ). Mesonotum pale brown with medioparapsidal suture colorless, other sutures darker brown (Fig. 60 e View Figure 60 ). Meso- and metathoracic pleura and sterna with colorless, pale brownish and dark brown areas (Fig. 60 f View Figure 60 ). Cuticle of wings colorless, with microtrichiae brownish. Legs nearly colorless, with pale brown bordering on femur and base of tibia (Fig. 60 d View Figure 60 ). Abdomen very pale brownish with colorless sigilla. Cerci colorless with setae brownish.

Hypodermal coloration. As in imago.

Texture. On all legs of both sexes, each tarsomere covered mostly with blunt microlepides, with pointed microlepides near apex (as in Fig. 70 i View Figure 70 ).

Imago. Imago, male. Head ochre. Antennae ochre. Turbinate eyes red, widened apically. Thorax ochre, equally pale dorsally, laterally, and ventrally, with dark brown hypodermal markings on lateral sides. Fore wing with membrane colorless, veins ochre. Pterostigma with three or four incomplete, oblique cross veins (Fig. 60 a – c View Figure 60 ). Legs mostly ochre; on leg of each pair, anterior side of femur with contrasting, dark brown, longitudinal macula just proximad of midlength; posterior side of femur with reddish brown macula near apex (Fig. 60 g View Figure 60 ). Abdomen mostly whitish or ochre; each tergum I – IX with dark brown transverse band close to posterior margin; each tergum III and IV with pair of brown spots; tergum IV with transverse brown macula posteriad-mediad of them (Fig. 60 a – c View Figure 60 ). Cerci ochre.

Genitalia (Fig. 61 c, d View Figure 61 ). Sterno-styligeral muscle absent. Each unistyliger sharply widened apically on median side, so that median margins convergent distally. 1 st segment of gonostylus with lateral side convex, median side median side gradually turns to 2 nd segment. Second segment equally wide all over its length. Third (terminal) segment of gonostylus nearly as wide as 2 nd, with length slightly exceeding width. Penial bridge with wide, blunt, membranous projection between unistyligers. Each gonovectis parabolic, with lateral (basal) and median (apical) portions equally long, apex bent medially-caudally.

Imago, female (Fig. 60 d View Figure 60 ). Unknown. Judging by subimago, coloration of head, thorax, and legs similar to that of male; abdominal terga with ochre-brown pigmentation.

Egg. Unknown.

Dimension.

Fore wing length (and approximate body length) 4–5 mm.

Distribution.

New Guinea (Fig. 147 View Figure 147 ).