Plumachaetas belae, Oliveira & Greenslade & Bellini, 2019

Oliveira, Fábio G. L., Greenslade, Penelope & Bellini, Bruno Cavalcante, 2019, Four new species of Plumachaetas Salmon (Collembola: Entomobryoidea) from Oceania with comments on the genus and a key to species, Zootaxa 4706 (1), pp. 121-146 : 123-127

publication ID	https://doi.org/ 10.11646/zootaxa.4706.1.5
publication LSID	lsid:zoobank.org:pub:B5C7776D-DC1C-43BE-AEAE-3983F88A426D
persistent identifier	https://treatment.plazi.org/id/0A6887FB-0E43-FFEE-5CBE-FDB07AB2F869
treatment provided by	Plazi
scientific name	Plumachaetas belae
status	sp. nov.

Treatment

Plumachaetas belae sp.nov. Oliveira, Bellini & Greenslade

Figs 1–2 View FIGURE 1 View FIGURE 2 ; 3A View FIGURE 3 ; 5A, C, D, H View FIGURE 5 ; 6A, B, F View FIGURE 6 ; 7A View FIGURE 7 ; 8A View FIGURE 8 ; 9 View FIGURE 9 A–B; 10A–B; 11A–B; 12A; 13A–C; 14A, E, I, J; 15; Table 1 View TABLE 1

Type material. Holotype female, deposited at Australian Museum of Sydney on slide Nº AMS/ COLL 00000001 : Australia, New South Wales, Taree, Lorien Wildlife Refuge , 31° 45’04”S, 152°32’03”E, Malaise Trap, Forest, Jan 17–Feb 4, 2012, G. & B. Williams coll. GoogleMaps Paratypes deposited at Australian Museum of Sydney on slides Nº AMS/ COLL 00000002–00000006 : 2 males, 3 females, same data as holotype GoogleMaps . Paratypes deposited at South Australian Museum ( SAMA), on slides Nº AMS/ COLL 00000001–00000005 : 4 males, 1 female, same data as holotype GoogleMaps . Paratypes deposited at South Australian Museum ( SAMA), 10 specimens in ethanol Nº AMS/ COLL 00000006 , same data as holotype GoogleMaps .

Diagnosis. Tibiotarsi distal region dark blue ( Fig.3A View FIGURE 3 ). Ant.IV apical region with 1 thick, ciliate chaeta ( Fig.5A View FIGURE 5 ). Ant.I with 6–7 dorsal mac ( Fig.5D View FIGURE 5 ). Labral chaetae p0–1 longer than others ( Fig.5H View FIGURE 5 ). Dorsal head chaetotaxy with 4 M and Pa1 mac, Pi mac missing ( Fig.8A View FIGURE 8 ). Labial basolateral and basomedian fields with chaetae M1–2, R, L1–2 ciliated, others smooth ( Fig.6B View FIGURE 6 ). Th. II central region with 3–4 m and 8 p mac ( Fig.9A View FIGURE 9 ). Th.III central region with 12 mac ( Fig.9B View FIGURE 9 ). Abd.I with 4 mac ( Fig.10A View FIGURE 10 ). Abd.II with 4 central and 1 lateral mac ( Fig. 10B View FIGURE 10 ). Abd.III with 2 central and 4 lateral mac ( Fig.11A View FIGURE 11 ). Abd.IV with 29–31 central and 8 lateral mac ( Fig.11B View FIGURE 11 ). Trochanteral organ with 115–117 spine-like chaetae ( Fig.14A View FIGURE 14 ). Ventral tube anterior region with 8 + 8 distal mac ( Fig.13A View FIGURE 13 ). Dens lack- ing modified large distal chaeta, mucro with 2 teeth ( Fig. 14I View FIGURE 14 ).

Description. Body pale yellow to white on ethanol; antennae and legs light bluish with dark blue pigment on proximal and distal Ant.I–II, antero-dorsal and lateral head, lateral Th.II–Abd.II, antero-lateral margin and two spotted areas on dorso-posterior Abd.IV, lateral and central Abd.V, distal and proximal tibiotarsi and distal femora. Eyepatches dark ( Fig.3A View FIGURE 3 ). Apically pointed strongly ciliate elongate scales covering Ant.I–II, dorsal and lateral head, dorsal trunk, legs, ventral manubrium and dentes ( Figs 1A, 1C View FIGURE 1 , 8A View FIGURE 8 ); ventral tube devoid of scales. Body (head+trunk) length of holotype 3390μm (trunk: 2996 μm; head: 786 μm).

Head. Antennae longer than body length ( Figs1A View FIGURE 1 , 3A View FIGURE 3 ). Holotype antennae lengths: 3769 μm (Ant.I= 655 μm; Ant.II= 1013 μm; Ant.III= 712μm; Ant.IV= 1389μm). Ant.IV annulated, with at least three types of chaetae: blunt sensilla and normal ciliate chaetae of different sizes and one thick apical chaeta ( Figs1B View FIGURE 1 , 5A View FIGURE 5 ). Ant.III apical sense organ with 2 small sensory rods in cavity plus 3 surrounding guard sensilla ( Fig.5C View FIGURE 5 ). Ant.I with 6 dorsal mac ( Fig.5D View FIGURE 5 ). Prelabral chaetae (4) ciliate, labral chaetotaxy formula with 5 (p0–2), 5 (m0–2), 4 (a1–2) smooth chaetae, p0–1 longer than others ( Figs1E View FIGURE 1 , 5H View FIGURE 5 ). Five interocular chaetae present, p as mes and t, r, q and v as mic ( Figs1D View FIGURE 1 , 8A View FIGURE 8 ). Dorsal head chaetotaxy as in Fig.8A View FIGURE 8 with 12 An, 4 A, 4 M, 7–8 S, 2 Ps, 4 Pa, 3 Pm and 4 Pp mac. Labial basolateral and basomedial fields with M1–2, R, L1–2 as ciliate chaetae, a1–5 and e as smooth chaetae; R chaeta not reduced ( Fig.6B View FIGURE 6 ). 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 accessory chaetae ( Figs1G View FIGURE 1 , 6A View FIGURE 6 ); labial papillae with 5 smooth proximal chaetae. Maxillary outer lobe with 1 apical smooth appendage (a.a.) and 1 subapical, blunt, finely ciliate chaeta (b.c.); sublobal plate with 3 chaeta-like appendages ( Figs1F View FIGURE 1 , 6F View FIGURE 6 ). Cephalic groove with 9 +9 surrounding mac ( Fig.7A View FIGURE 7 ).

Trunk dorsal chaetotaxy. Th.II with 1 a (a5, excluding anterior collar), 3–4 central m (m4 present or absent) and 8 central p main mac ( Fig. 9A View FIGURE 9 ). Th.III with 12 central mac (with unclear homologies) ( Fig.9B View FIGURE 9 ). Abd.I with 3 m and 1 p mac, acc.p6 sensillum present ( Fig. 10A View FIGURE 10 ). Abd.II with 5 m mac ( Fig.10B View FIGURE 10 ). Abd.III with 1 a (a1), 4 m and 1 p mac ( Fig. 11A View FIGURE 11 ). Abd.IV with 29–31 central and 8 lateral mac, all with unclear homologies ( Fig.11B View FIGURE 11 ). Abd.V with 4 a, 5 m, 14 p plus 5 mac with unclear homologies ( Fig.12A View FIGURE 12 ).

Legs. Trochanteral organ with 115–117 spine-like chaetae ( Fig.14A View FIGURE 14 ). Tibiotarsus III with one straight smooth chaeta near unguiculus, tenent hair smooth, longer than unguis, anterior and posterior pretarsal chaetae present ( Figs2A View FIGURE 2 , 14E View FIGURE 14 ). Ungues with 1 dorsal, 2 paired outer and 4 inner teeth, 2 proximal paired, 1 median and 1 distal; unguiculi lanceolate with outer lamella serrated, with one proximal larger tooth ( Figs2A View FIGURE 2 , 14E View FIGURE 14 ).

Abdominal appendages. Ventral tube anterior face with 8 +8 distal mac ( Figs 2B View FIGURE 2 , 13A View FIGURE 13 ); posterior face lacking smooth distal chaetae, with several mic and mes of different sizes ( Figs2D View FIGURE 2 , 13B View FIGURE 13 ); lateral flaps with about 7 smooth and 27 ciliate chaetae ( Fig.13C View FIGURE 13 ); papillae of eversible sacs pointed ( Fig.2C View FIGURE 2 ). Manubrial plate with 2 mac and 2 pseudopores. Manubrium and dens dorsally covered by several chaetae ( Fig.2F View FIGURE 2 ), ventrally scaled; dens lacking modified large distal chaeta ( Figs2 View FIGURE 2 G–H, 14I). Mucro bidentate ( Figs2 View FIGURE 2 G–H, 14I).

Etymology. The new species honours a special person and friend of the first author, Maria Isabel Protti Balbi, nicknamed as “Bel”, who helped us finding the specimens.

Distribution and habitat. The new species was collected in the Lorien Wildlife Refuge and Conservation Area located in south eastern New South Wales. The vegetation consists of coastal subtropical and wet sclerophyll forest. This new species has only been collected in this one locality but is expected to be widespread in this region and is clearly arboreal as it was collected in a Malaise trap ( Fig.15 View FIGURE 15 ).

Remarks. The new species is similar to Plumachaetas mamuensis sp. nov., P.queenslandica ( Schött, 1917) (as redescribed in Greenslade & Yoshii 2000) and P.yoshii Zhang & Deharveng, 2015 (in: Zhang & Deharveng, 2015b) in its moderate number of central mac on Th.II and Abd.I, high number of antero-central mac on Abd.IV and trochanteral organ spines. The new species is distinguished from them by the following combination of characters: dorsal head with M1–4 (M 2–4 in P.mamuensis sp. nov., M 1–2, 4 in P.queenslandica and only M 2 in P.yoshii ) Ps2, and Ps5 as mac (only Ps 2 in P.mamuensis sp. nov., and only Ps 5 in P.yoshii ); Th.II central region with 3–4 m and 8 p mac; Th. III central region with 12 mac; Abd.I with 4 mac; Abd.II with 4 central mac; Abd.III with a1 (only present in P.mamuensis sp. nov.) and m3 mac (apparently absent in P.queenslandica ). The new species also differs in tibiotarsi being distally dark blue (whitish in P.queenslandica ); labral chaetae p0–1 enlarged (only p 1 in P.mamuensis sp. nov. and p 0–2 in P.yoshii ); labial chaetae M1–2, R, L1–2 ciliate (M1–2, R, E, L 2 in P.mamuensis sp. nov., M1–2, R, L 2 in P.queenslandica and M1, R, E, L 1–2 in P.yoshii ); trochanteral organ with about 115 spines; ventral tube anterior distal mac 8+8; ventral tube eversible sacs with pointed papillae (rounded in P.queenslandica , unclear in the other two species) and mucro with 2 teeth. Differences between Plumachaetas spp. are summarised in Table1 View TABLE 1 .