Plumachaetas wanangensis Oliveira & Greenslade & Bellini 2019, sp.nov.

Plumachaetas wanangensis sp.nov. Oliveira, Bellini & Greenslade

Figs 3D; 5A,C,G,I; 6A,E,I; 7D; 8D; 9 G–H; 10G–H; 11D; 12J–L; 13D,H,L; 15; Table 1

Type material. Holotype female, deposited at Australian Museum of Sydney on slide NºAMS/ COLL 00000013: Papua New Guinea, Madang Province, Wanang Conservation Area, 5° 13.517’S; 145°4.880’E, Malaise Trap, 18– 22.XI. 2015, N. von Ellenrieder & R. W. Garrison coll, Forest Edge by oxbow pond, 80 m. Paratype deposited at Australian Museum of Sydney on slide NºAMS/ COLL 00000014: 1 female on slide, same data as holotype.

Diagnosis. Tibiotarsi distal region dark blue (Fig.3D). Ant.IV apical region with one thick chaeta (Fig.5A). Ant.I with 8–10 dorsal mac (Fig.5G). Labral chaetae p1 longer than others, p0 normal (Fig. 5I). Dorsal head chaetotaxy with 2 M and 1 Pi mac, Ps mac absent (Fig.8D). Labial basolateral and basomedian fields with only L2 ciliated, others smooth (Fig.6E). Th.II central region with 5 m and 9 p mac (Fig.9G). Th.III central region with 13 mac (Fig.9H). Abd.I with 6–7 mac (Fig.10G). Abd.II with 6 central and 1 lateral mac (Fig.10H). Abd.III with 2 central and 4 lateral mac (Fig.11G). Abd.IV with 18 central and 11 lateral mac (Fig.11H). Trochanteral organ with about 40 spine-like chaetae (Fig.14D). Ventral tube anterior region with 5+ 5 distal mac (Fig. 13J). Dens lacking modified large distal chaeta, mucro with 4 teeth (Fig.14J).

Description. Body pale yellow to brownish on ethanol; Ant.I–II light blue with dark blue pigment on proximal and distal regions of both segments, whole Ant. III–IV, lateral and posterior head, lateral Th.II–Abd.II, central lateral and posterior Abd.III, four central lateral spots and lateral posterior margins of Abd.IV, distal tibiotarsi and distal femora. Eyepatches dark (Fig.3D). Apically pointed strongly ciliate elongate scales covering Ant.I–II, dorsal and lateral head, dorsal trunk, legs, ventral manubrium and dentes; ventral tube devoid of scales. Body (head+ trunk) length of holotype 1922 μm (trunk: 1492μm; head: 430μm).

Head. Antennae longer than body length (Fig.3D). Holotype antennae lengths: 2440μm (Ant.I= 402 μm; Ant.II= 596 μm, Ant.III= 534μm, IV= 908μm). Ant.IV not annulated with at least three types of chaetae: blunt sensilla and normal ciliate chaetae of different sizes and one thick apical chaeta (Fig.5D). Ant.III apical sense organ with 2 small sensory rods in cavity plus 3 surrounding guard sensilla (Fig. 5C). Ant.I with 8 dorsal mac (Fig. 5G). Prelabral chaetae (4) ciliate, labral chaetotaxy formula with 5 (p0–2), 5 (m0–2), 4 (a1–2) smooth chaetae, p1 longer than others, p0 normal (Fig. 5I). Dorsal head chaetotaxy as in Fig.8D with 10 An, 2–3 A, 2 M, 7 –8 S, 1 Pi, 4 Pa, 3 Pm and 4 Pp mac, Ps2 as mic, Ps5 as mes. Labial basolateral and basomedial fields with L2 ciliated chaeta; m2, r, e, l1, a1–5 as smooth chaetae; r chaeta not reduced (Fig.6E). Labial palp with 5 main papillae (A–E) with 0, 5, 0, 4, 4 guard chaetae, respectively; papilla E with lateral process (l.p.) finger-shaped, not reaching the papilla base; papilla H with 2 accessorial chaetae (as in Fig.6A); labial papillae with 5 smooth proximal chaetae. Maxillary outer lobe with 1 apical smooth appendage (a.a.) and 1 subapical blunt discretely ciliate chaeta (b.c.); sublobal plate with 3 chaeta-like appendages (Fig. 6I). Cephalic groove with several microchaetae and 3 +3 surrounding anterior mac (Fig.7D).

Trunk dorsal chaetotaxy. Th.II with 1 a (a5, excluding anterior collar), 5 central m and 9 central p main mac (Fig.9G). Th.III with 13 central mac (with unclear homologies) plus a6 lateral mac (Fig.9H). Abd.I with 6–7 mac, acc.p6 sensillum not seen, possibly absent (Fig.10G). Abd.II with 6 central and 1 lateral mac (Fig. 10H). Abd III with 1 a (a1), 4 m and 1 p mac (Fig.11G). Abd.IV with 18 central and 11 lateral mac, all with unclear homologies (Fig.11H). Abd.V with 3 a, 5 m, 10 p plus 3 mac with unclear homologies (Fig.12D).

Legs. Trochanteral organ with about 40 spine-like chaetae (Fig.14D). Tibiotarsus III with one straight smooth chaeta near unguiculus, tenent hair smooth, longer than unguis, anterior and posterior pretarsal chaetae present (Fig.14H). Ungues with 1 dorsal, 2 paired outer and 4 inner teeth, 2 proximal paired, 1 median and 1 distal; unguiculi lanceolate with outer lamella smooth (Fig.14H).

Abdominal appendages. Ventral tube anterior face distal region with 5+5 mac plus 1 +1 mes (Fig.13J); posterior face lacking smooth distal chaetae, with several mic and mes of different sizes (Fig.13K); lateral flaps with about 11 smooth and 4 ciliate chaetae (Fig.13L). Manubrial plate with 2 mac and 2 pseudopores. Manubrium and dens dorsally covered by several chaetae, ventrally scaled; dens lacking modified large distal chaeta. Mucro with 4 teeth (Fig.14J).

Etymology. The new species name honours the community living and caring for the Wanang Conservation Area, the type locality.

Distribution and habitat. An arboreal species found on one site in lowland tropical rainforest in Wanang Conservation Area near the north coast of Papua New Guinea (Fig.15).

Remarks. The new species most resembles P.dahlii (Schäffer, 1898) sensu Yoshii & Suhardjono (1992), P.halmaherae (Yoshii & Suhardjono, 1992) and P.seramica (Yoshii & Suhardjono, 1992) in labral p row with only p1 enlarged, a reduced number of Th.II central p chaetae, dens lacking enlarged distal chaetae and four mucronal teeth. Plumachaetas wanangensis sp.nov. differs from other congeners in the combination of: dorsal head with 2 M chaetae (M2, 4); Th. II with 9 p mac; Th.III with 13 central mac; Abd.I with 6–7 mac; Abd.II with 6 central mac; Abd.III with a1 chaeta; only L2 labial chaeta ciliate (R and L 2 in P.dahlii, all smooth in P.halmaherae and P.seramica); unguiculus lanceolate (weakly truncate in P.seramica, truncate in P.halmaherae); trochanteral organ with about 40 spine-like chaetae and ventral tube anterior distal mac 5 +5 (see also Table1).