Ectonura snowdeni , Queiroz, Gabriel C. & Deharveng, Louis, 2015

Queiroz, Gabriel C. & Deharveng, Louis, 2015, New genus, new species and new record of Neanurinae (Collembola, Neanuridae) for the Neotropics, Zootaxa 4020 (1), pp. 134-152: 136-140

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Ectonura snowdeni


Ectonura snowdeni  sp.nov.

Figs 2–10View FIGURES 2 – 5View FIGURES 6 – 10; Tabs 1, 2

Type material. Holotype: male (# 2238 CM/ MNRJ), 25.xi. 2011, Queiroz G.C. leg. Paratypes: 1 female and 1 juvenile, same data as holotype; 2 juveniles (# 2351 CM/ MNRJ) 11.iv. 2012, Queiroz G.C. leg. Material deposited at MNRJ in Brazil. Female (same data of holotype) and 1 juvenile (# 2351 CM/ MNRJ, 11.iv. 2012, Queiroz G.C. leg) deposited at MNHN in Paris, France. Type locality. Parque Nacional do Caparaó (ICMBio), Alto Caparaó municipality, Minas Gerais State, Brazil. 2500–2800 m a.s.l. Local coordinates: 20 ° 26 ' 7 "S 41 ° 47 ' 54 "W. Leaf litter and soil of "campos de altitude".

Description. Length 0.6–1.2mm (n= 7). Colour white in ethanol. Eyes 2 + 2, unpigmented, their diameter twice the length of Ocm socket diameter. Habitus typical of the genus ( Fig. 2View FIGURES 2 – 5). Weak cryptopygy. Head and tergite tubercles weakly developed, differentiated in small bosses, with tertiary granulation. Dorso-internal tubercles of head and Th I –Abd IV not differentiated, without elementary tubercles. No reticulations. No plurichaetosis. No button-hole structures on tergites.

Dorsal chaetotaxy constituted of ordinary chaetae and S-chaetae. Ordinary chaetae differentiated in dorsal macrochaetae of similar length and morphology, rather small, with strong serrations in the distal 1 / 3 - 1 / 2 of their length, distally sheathed, rounded apically; lateral macrochaetae longer, less serrated and thinner apically (details of Fig. 2View FIGURES 2 – 5); 1 + 1 mesochaetae of CL and 4 mesochaetae of (L+So) on head, 3 mesochaetae of L on abd IV and 1 of L on Abd V smooth and acuminate; microchaetae present, thinner, shorter, bent, acuminate and smooth. S-chaetae thinner, slightly shorter than closest macrochaetae.

Antennae shorter than head, less than two times as long as wide at basis. Ant I with 7 chaetae, Ant II with 11 chaetae. Ant III with 18 ordinary chaetae and 5 S-chaetae of Ant III organ, guard chaetae Sgd and Sgv slightly longer and slender than S-chaetae of Ant IV. Ant IV organite as a very small rod, almost entirely burried in the integument; apical bulb slightly or undistinctly trilobed, fused to Ant IV tip. Eight subequal S-chaetae (S 1 –S 8) on Ant IV, S 4 slighlty stouter than others ( Fig. 3View FIGURES 2 – 5).

Buccal cone moderately elongated. Maxilla styliform, mandible thin and bidentate. Labrum rounded apically, elongated, labral formula?/? 2,4. Labium with 4 basal, 3 distal and 3 lateral chaetae; 2 x-papillae visible ( Fig. 4View FIGURES 2 – 5).

Head chaetotaxy as in Table 1, with 13 chaetal groups: CL, 2 An, 2 Oc, 2 Di, 2 De, 2 DL, 2 (L+So). Tubercles weakly developed, An adjacent to Oc from which it is only separated by a single row of secondary granules, and chaeta O absent; F, G and B on the edge of tubercles, D free). No tubercle Di. Detail of DL and (L+So) in Figure 4View FIGURES 2 – 5, chaeta So 5 not detected.

Tergite chaetotaxy illustrated on Fig. 2View FIGURES 2 – 5. Tubercles Di not differentiated; De, DL and L weakly developed, visible from head to Abd VI. Chaetal group Di of Th II –III with 3 chaetae (Di 1 as M and Di 2 -Di 3 as mi). Tubercle De of Th III with 2 chaetae (De 1 as M and De 2 as mi) and 1 S-chaeta. Tubercles De and DL separate on Abd IV. Abd V with tubercles Di fused on the axis, separated from De; two chaetae VL(+?L) located ventrally, without tubercle. Tubercle Di of Abd V with Di 1 as M, Di 2 as mi and Di 3 absent. Abd VI bilobed. S-chaetotaxic formula: 2 +ms, 2 / 11111.

Tita without chaeta M and with B 4 –B 5 not longer than other long chaetae of the Tita ( Fig. 6View FIGURES 6 – 10). Claw untoothed, not striated in its basal part, and devoid of secondary granulation.

Ventral chaetotaxy of Abd I –VI as in Fig. 7View FIGURES 6 – 10. Furcal rest with 3 or 4 chaetae, devoid of mi but with a small posterior area of primary granulation ( Fig. 8View FIGURES 6 – 10). Female genital plate as in Fig. 9View FIGURES 6 – 10. Male genital plate without modified chaetae ( Fig. 10View FIGURES 6 – 10). Postcephalic chaetotaxy summarized in Table 2.

Etymology. Species named in honour of Edward Snowden.

Discussion. The new species Ectonura snowdeni  sp. nov. is the first of the genus to be found in the Neotropical region, other described species being known from New Caledonia and South Africa, with a mention from Australia without described species ( Greenslade & Deharveng, 1990). It shares with three other species of the genus (E. koumac Deharveng & Bedos, 2002, E. monochaeta Janion, Bedos & Deharveng, 2011 and E. sylvatica Deharveng, Weiner & Najt, 1997), a reduction on the number of chaetae of the lateral tubercle of abdomen ( Table 3). All four species have one or two chaetae on tubercle L of Abd I –III. However, they differ by several characters listed in Table 3. Axial tubercles Di on Th II –Abd V are developed in E. koumac and E. monochaeta, while they are only present on Abd V in E. snowdeni  sp. nov.; Abd V tubercles are fused in E. koumac and E. snowdeni  sp. nov., separate in E. monochaeta and E. sylvatica; from E. sylvatica, the new species differs mainly by the number of chaetae on Ant I (7 versus 8) and the labrum (rounded versus ogival) The overal combination of characters of E. snowdeni  sp. nov. clearly separates it from its congeners, indicating stronger similarities with New Caledonian than South African species (see Table 3). Its disjunct distribution is however puzzling, and evolutionary convergence with austral Ectonura may not be completely ruled out.

*on joint tubercles Di.

TABLE 1. Dorsal Cephalic chaetotaxy of Ectonura snowdeni sp. nov.

  Tubercle Number of chaetae Type of chaetae  
        So1, L4 L2, So3, So4, So6

TABLE 2. Postcephalic chaetotaxy of Ectonura snowdeni sp. nov.

  Di     Scx2 Cx     Tita
    2+S         12  
Th III   2+S            

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