Plumachaetas belae,

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

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Plumachaetas belae


Plumachaetas belae  sp.nov. Oliveira, Bellini & Greenslade

Figs 1–2View FIGURE 1View FIGURE 2; 3AView FIGURE 3; 5A, C, D, HView FIGURE 5; 6A, B, FView FIGURE 6; 7AView FIGURE 7; 8AView FIGURE 8; 9View FIGURE 9 A–B; 10A–B; 11A–B; 12A; 13A–C; 14A, E, I, J; 15; 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 holotypeGoogleMaps  . Paratypes deposited at South Australian Museum ( SAMA), on slides Nº AMS/ COLL 00000001–00000005: 4 males, 1 female, same data as holotypeGoogleMaps  . Paratypes deposited at South Australian Museum ( SAMA), 10 specimens in ethanol Nº AMS/ COLL 00000006, same data as holotypeGoogleMaps  .

Diagnosis. Tibiotarsi distal region dark blue ( Fig.3AView FIGURE 3). Ant.IV apical region with 1 thick, ciliate chaeta ( Fig.5AView FIGURE 5). Ant.I with 6–7 dorsal mac ( Fig.5DView FIGURE 5). Labral chaetae p0–1 longer than others ( Fig.5HView FIGURE 5). Dorsal head chaetotaxy with 4 M and Pa1 mac, Pi mac missing ( Fig.8AView FIGURE 8). Labial basolateral and basomedian fields with chaetae M1–2, R, L1–2 ciliated, others smooth ( Fig.6BView FIGURE 6). Th. II central region with 3–4 m and 8 p mac ( Fig.9AView FIGURE 9). Th.III central region with 12 mac ( Fig.9BView FIGURE 9). Abd.I with 4 mac ( Fig.10AView FIGURE 10). Abd.II with 4 central and 1 lateral mac ( Fig. 10BView FIGURE 10). Abd.III with 2 central and 4 lateral mac ( Fig.11AView FIGURE 11). Abd.IV with 29–31 central and 8 lateral mac ( Fig.11BView FIGURE 11). Trochanteral organ with 115–117 spine-like chaetae ( Fig.14AView FIGURE 14). Ventral tube anterior region with 8 + 8 distal mac ( Fig.13AView FIGURE 13). Dens lack- ing modified large distal chaeta, mucro with 2 teeth ( Fig. 14IView 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.3AView 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, 1CView FIGURE 1, 8AView 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 ( Figs1AView FIGURE 1, 3AView 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 ( Figs1BView FIGURE 1, 5AView FIGURE 5). Ant.III apical sense organ with 2 small sensory rods in cavity plus 3 surrounding guard sensilla ( Fig.5CView FIGURE 5). Ant.I with 6 dorsal mac ( Fig.5DView 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 ( Figs1EView FIGURE 1, 5HView FIGURE 5). Five interocular chaetae present, p as mes and t, r, q and v as mic ( Figs1DView FIGURE 1, 8AView FIGURE 8). Dorsal head chaetotaxy as in Fig.8AView 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.6BView 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 ( Figs1GView FIGURE 1, 6AView 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 ( Figs1FView FIGURE 1, 6FView FIGURE 6). Cephalic groove with 9 +9 surrounding mac ( Fig.7AView 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. 9AView FIGURE 9). Th.III with 12 central mac (with unclear homologies) ( Fig.9BView FIGURE 9). Abd.I with 3 m and 1 p mac, acc.p6 sensillum present ( Fig. 10AView FIGURE 10). Abd.II with 5 m mac ( Fig.10BView FIGURE 10). Abd.III with 1 a (a1), 4 m and 1 p mac ( Fig. 11AView FIGURE 11). Abd.IV with 29–31 central and 8 lateral mac, all with unclear homologies ( Fig.11BView FIGURE 11). Abd.V with 4 a, 5 m, 14 p plus 5 mac with unclear homologies ( Fig.12AView FIGURE 12).

Legs. Trochanteral organ with 115–117 spine-like chaetae ( Fig.14AView FIGURE 14). Tibiotarsus III with one straight smooth chaeta near unguiculus, tenent hair smooth, longer than unguis, anterior and posterior pretarsal chaetae present ( Figs2AView FIGURE 2, 14EView 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 ( Figs2AView FIGURE 2, 14EView FIGURE 14).

Abdominal appendages. Ventral tube anterior face with 8 +8 distal mac ( Figs 2BView FIGURE 2, 13AView FIGURE 13); posterior face lacking smooth distal chaetae, with several mic and mes of different sizes ( Figs2DView FIGURE 2, 13BView FIGURE 13); lateral flaps with about 7 smooth and 27 ciliate chaetae ( Fig.13CView FIGURE 13); papillae of eversible sacs pointed ( Fig.2CView FIGURE 2). Manubrial plate with 2 mac and 2 pseudopores. Manubrium and dens dorsally covered by several chaetae ( Fig.2FView FIGURE 2), ventrally scaled; dens lacking modified large distal chaeta ( Figs2View FIGURE 2 G–H, 14I). Mucro bidentate ( Figs2View 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.15View 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.


South Australia Museum