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

Papuanatula (Papuanatula) plana Lugo-Ortiz & McCafferty, 1999 View in CoL

Figs 17 View Figure 17 , 18 View Figure 18 , 19 View Figure 19 , 20 View Figure 20 , 21 View Figure 21 , 22 View Figure 22 , 23 View Figure 23 , 24 View Figure 24

Papuanatula plana View in CoL . 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 View Figure 17 – 22 View Figure 22 ). Body length 3.7–4.1 mm, cerci much longer than body length.

Coloration (Fig. 17 a – c View Figure 17 ). Description see Lugo-Ortiz and McCafferty (1999: 66–67).

Head. Antenna (Fig. 17 a View Figure 17 ). Length 1.5 × head length. As typical for the subgenus. Developing turbinate eyes in last instar male larva (Fig. 20 e View Figure 20 ) large, subquadrangular, nearly touching each other in the middle. Labrum (Fig. 18 a, b View Figure 18 ). Length 0.5 × maximum width, laterally convex. Dorsal, sub-marginal arc with ~ 14 feathered setae. Right mandible (Fig. 18 d, e View Figure 18 ). Margin between prostheca and mola with row of minute denticles. Otherwise, as typical for subgenus. Left mandible (Fig. 18 f, g View Figure 18 ). Margin between prostheca and mola with row of minute denticles. Otherwise, as typical for subgenus. Hypopharynx (Fig. 18 c View Figure 18 ). As typical for genus. Maxilla (Fig. 19 c, d View Figure 19 ). 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 View Figure 19 ). 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 View Figure 108 ). Terga without protuberances. Legs (Fig. 20 a – d View Figure 20 ). 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 View Figure 21 , 22 a – d View Figure 22 ). 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 View Figure 21 ). Narrow-elongate, tracheation absent or poorly developed; margins smooth, with short, fine, simple setae. Paraproct (Fig. 21 d View Figure 21 ). Posterior margin without prolongation, smooth. Caudalii (Fig. 21 b, c View Figure 21 ). Cerci without swimming setae. Paracercus with nine segments.

Pose of subimaginal gonostyli under larval cuticle (Fig. 21 f View Figure 21 ). 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 View Figure 23 , 24 a, b View Figure 24 ). 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 View Figure 24 ). 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 View Figure 146 ).