Entomobrya palmensis Jordana & Baquero, 2010

Baquero, Enrique & Jordana, Rafael, 2018, Entomobrya (Collembola, Entomobryidae) for the Canary Islands, Zootaxa 4461 (2), pp. 151-195 : 188-189

Entomobrya palmensis Jordana & Baquero, 2010

Figs 3H , 4P , 20 19A–G , Table 2

Material studied. La Palma, La Caldera: on Cistus vaginatus , 4.V.1973, coordinates 28.70003°N, 17.86403°W, 1285 m a.s.l., (Loc. 04) A. Machado leg., one female on slide ( MZLU-VAR00001748 ) and 16 specimens in ethyl alcohol ( MZLU-VAR00001749 to MZLU-VAR00001764 ); Bco. de Los Limonas , 1987 (exact date unknown) , Fouchet & Rougnelte leg., unknown coordinates (Loc. 06), 250–300 m a.s.l., one female on slide (MZLU-VAR00001765); Puntagorda, dry rocks, Grass, Carlina , 28.II.1988, 167/88, coordinates 28.77629°N, 17.96737°W, 770 m a.s.l., (Loc. 03) A. Fjellberg leg., one female on slide (MZLU-VAR00001766).

Description of the specimens studied from the Canary Islands. Body length up to 2.30 mm, excluding antennae. Ground colour pale or very light yellow, dark pigment on lateral body, transversal stripes on posterior Th II to Abd III, triangular patches on dorsolateral Abd I to III, a transversal band on first third of Abd IV, and a lateral patch on posterior Abd IV; legs with lateral patches from last half of femur; antenna with pigment on tip of Ant I, and from middle half of Ant II ( Figs 3H , 4P ).

Head. Eight eyes, GH smaller than EF. Antennae length 1.13 mm, 2.95 times the length of the head (n = 2). Ant IV with apical vesicle simple or bilobed. The relative length of Ant I/II/III/IV = 1/2.06/2.00/2.12. Prelabral chaetae apparently smooth. Labral papillae slightly multispinose, but apparently simple, smooth ( Fig. 19E ). Lateral process of labial papilla E a little shorter than the papilla.

Body. Length ratio of Abd IV/III between 3.00 and 4.30 (n = 2). Trochanteral organ with approximately 20–25 chaetae. Tibiotarsus not sub-segmented, without smooth chaetae, except for smooth terminal chaeta on legs III. Claw with four teeth: paired at 50–60% and first unpaired at 75–80% from basis; dorsal teeth not basal ( Fig. 19F ). Empodium spike-like, with smooth external lamella in leg III. Tenent hair clavate. Length of manubrium and dens 0.35–0.40 and 0.50–0.52 mm, respectively (n = 2). Manubrial plate with 5-11 chaetae and two pseudopores. Mucro with teeth similar in size (one specimen with the subapical smaller than apical), mucronal spine reaching the tip of the subapical tooth ( Fig. 19G ).

Macrochaetotaxy ( Figs 19A–D ). Simplified Mc formula: 4-3-0-4-3/2-4/2-4/1-2-1/3-2-3-2-2. Head: in addition to the information of the formula, an additional ms or Mc is present externally to S4 (S4p) on H 4 in some specimens. Mesothorax: area T1 with two Mc (m1 and m 2i); T2 with five Mc (m4, m 4i, a5 and m5). Abdomen: Abd II area A1 with s Mc (a2 and a3), area A2 with four Mc (m3, m3ep, m3e and m3ea2); Abd III with one Mc each on areas A3 (a1) and A5 (m3e) and two Mc on A4 (a2 and a3); Abd IV with three Mc on A6 (B e2, B e3 and D1), two Mc on A7 (A3 and B3), three Mc on A8 (A4a, B4 and C2a), and two Mc on A9 (A5 and B5) and A10 (A6 and B6).

Ecology. Its habitats were referred in the original description to an altitude between 225 to 760 m asl, mainly in soil, under stones and litter of Pinus canariensis and Salix sp., and on or under low vegetation, such as Helianthemum sp., Descurainia millefolia , Viola palmensis , Erysimum scoparium , and in mosses near water. This species could be hygrophilous (Jordana & Baquero 2010). Now also found at 1285 m, on Cystus vaginatus in a forest area of laurisilva (La Caldera), also on dry rocks and over grass and Carlina at 700 m.

Remarks. Entomobrya palmensis is most similar to E. atteneri sp. nov., E. guacimarae sp. nov. and E. airami sp. nov. Differences between the E. palmensis and the aforementioned species are discussed in the Remarks to those species. In addition, Table 2 shows the differences between E. palmensis and other species that share the same chaetotaxy, all of them from the Canary Islands.

Figures

FIGURE 3. Entomobrya habitus: A, E. guayarminae sp. nov.; B, E. icoae sp. nov. (at left AbdII–IV with a darker pattern); C– D’, E. irayae sp. nov. C, clear form, D–D’ dark form; D’’ E. naziridisi; E, E. multifasciata (E’ dark form); F, E. nairae sp. nov.; F’ E. nevadensis; G, E. nigrocincta, male (G’ female); H, E. palmensis; I, E. cf. quiquelineata; J, E. unostrigata. Bar = 0.5 mm.

FIGURE 4. Entomobrya colouration pattern: A, E. achuteygai sp. nov.; B, E. airami sp. nov.; C, E. amelahuigei sp. nov. (C’. E. amelahuigei sp. nov., dark form); D, E. atteneri sp. nov.; E, E. nairae sp. nov.; F, E. atteneri sp. nov. (clear form); G; E. fainae sp. nov. (G’, E. fainae sp. nov., dark form); H, E. gazmirae sp. nov.; I, E. grimanesae sp. nov. (I’, E. grimanesae sp. nov., dark form); J, E. guacimarae sp. nov. (J’, intermediate colour form; J’’, pale form); K, E. guayarminae sp. nov.; L, E. icoae sp. nov.; M, E. irayae sp. nov.; N, E. multifasciata; O, E. nigrocincta male (O’, female); P, E. palmensis; Q, E. cf. quinquelineata; R, E. irayae sp. nov. dark form; S, E. unostrigata. Bar = 0.5 mm.

FIGURE 19. E. palmensis: A, head chaetotaxy; B, Th II chaetotaxy; C, Abd II–III chaetotaxy; D, Abd IV chaetotaxy; E, labral papillae; F, claw and empodium of leg III; G, tip of dens and mucro (bar for E, F and G 0.025 mm).

FIGURE 20. E. cf. quiquelineata: A, head chaetotaxy; B, Th II chaetotaxy; C, Abd II–III chaetotaxy; D, Abd IV chaetotaxy; E, labral papillae; F, claw and empodium of leg III; G, tip of dens and mucro (bar for E, F and G = 0.025 mm).