Aethiopella ricardoi

Paz, Raiane Vital Da, Queiroz, Gabriel Costa & Bellini, Bruno Cavalcante, 2019, A new species of Aethiopella Handschin, 1942 (Collembola, Poduromorpha, Neanuridae) from Neotropical Region, with comments on the genus, Zootaxa 4629 (1), pp. 39-50: 41-42

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Aethiopella ricardoi

sp. nov.

Aethiopella ricardoi  sp. nov.

Figs 1–16View FIGURE 1View FIGURES 2–6View FIGURE 7View FIGURES 9–16, Table 1

Type material. Holotype: female in slide ( CC /UFRN): Brazil, Rio Grande do Norte State, Nísia Floresta municipality, “Lagoa Redonda” Farm , 06°02’45.02”S 35°11’42.63”W, 49m, 15-16-iv-2017, pitfall-trap, Paz, R.V and Carvalho, M.N.A coll.GoogleMaps  Paratypes deposited in CC /UFRN  : 1 male in slide, same data as holotypeGoogleMaps  ; 2 males and 2 females collected in the same locality of the holotype, but during 16-18-vi-2018GoogleMaps  . Paratypes deposited in CC / MNRJ: 2 females and 1 male collected in the same locality of the holotype, but during 16-18-vi-2018GoogleMaps  ; 2 females collected in the same locality of the holotype, but during 13-15-iv-2018GoogleMaps  .

Diagnosis. Habitus oval to elongate; Ant. IV with trilobed apical bulb, with 7 (S1–S4, S7–S8 and S10) dorsal subcylindrical sensilla, ms absent; Ant. IV and III ventral separation marked; sensory rods of Ant. III organ small and club-shaped, Sgd relatively distant from the rods, ventral ms present; PAO with 13–19 vesicles; mandibles with 7–8 teeth, 4–5 tiny teeth at the apex plus 3 basal larger; maxillae styliform with two lamellae, apically the external one discretely curved outside (hooked); head lacking a0; dorsal trunk sensillar formula from Th. II to Abd. V as: 22/11111, mesochaetae apically blunt; Th. I with 2+2 dorsal chaetae; Tita I–III with 19/19/18 chaetae, respectively, M chaeta aligned to B series or slightly more proximal; ventral tube with 3+3 chaetae; tenaculum with 3 teeth on each ramus; manubrium with 11–12 chaetae; dens with 5–7 dorsal chaetae; mucro tapering at the apex; male’s eugenital chaetae not differentiated from others; anal valves with 2 hr chaetae.

Description. Habitus oval to elongate, specimens dark blue to brownish in ethanol ( Fig. 1View FIGURE 1). Body granules medium sized, uniformly distributed on tegument. Body length of holotype: 1.17 mm, range of type series 0.72 to 2.83 mm, average 1.54 mm.

Head ( Figs 2–7View FIGURES 2–6View FIGURE 7). Ratio cephalic diagonal: antenna in holotype = 1: 0.74. Ant. IV with trilobed apical bulb, dorsally with 7 subcylindrical sensilla (S1-S4, S7–S8 and S10), ms absent; ventrally with smaller chaetae ( Figs 2–3View FIGURES 2–6). Ant. III and IV fused dorsally, ventral separation marked ( Fig. 3View FIGURES 2–6). Sensory organ of Ant. III with two small clubshaped sensory rods in an integument depression, protected by two longer subequal guard sensilla (Sgd and Sgv), ventral ms present ( Figs 2–3View FIGURES 2–6). Ant. I and II with 7 and 11 chaetae, respectively ( Fig. 2View FIGURES 2–6). Mandible with 7–8 teeth, 3 basal larger plus 4–5 smaller apical teeth ( Fig. 4View FIGURES 2–6). Maxilla capitulum styliform with two partially fused lamellae, apically the external one discretely curved outside (hooked) ( Fig. 5View FIGURES 2–6). Oral cone moderately elongate. Basomedian and basolateral labial fields with chaetae F and e longer than others, labium lacking properly formed papillae, chaetae A –D present, C and D apically displaced ( Fig. 6View FIGURES 2–6). Eyes 8+8, subequal lenses, with 3 interocular chaetae (oc1–oc3) ( Fig. 7View FIGURE 7). PAO moruliform, larger than ocellus A, bearing 13–19 vesicles ( Fig. 7View FIGURE 7). Dorsal head chaetotaxy with micro (average 12 μm in holotype) and apically blunt mesochaetae (average 28 μm in holotype), a0 absent; d5–d1, sd5–sd1 and c3 present; c1–2, c4 absent; some specimens with 1 or 2 extra abnormal unpaired chaetae near d series, posterior one near d2 or d1 ( Fig. 7View FIGURE 7, white arrows).

Trunk dorsal chaetotaxy ( Figs 7View FIGURE 7 –8). Dorsal thorax and abdomen with heterochaetosis: micro (average 10 μm in holotype) and apically blunt mesochaetae (average 25 μm in holotype) plus long sensilla (average 54 μm in holotype) ( Figs 7View FIGURE 7 –8). Sensillar formula from Th. II to Abd. V as 22/11111. Th. I with 2+2 mesochaetae. Th. II–III chaetotaxy similar, with 3+3 chaetae on a series (a1, a4 and a6), 2+2 on m series (m5 and m7) and 5+5 on p series (p1–2, p4–p6); Th. II–III long sensilla as p4 and m7; lateral ms present on Th. II ( Fig. 7View FIGURE 7). Abd. I–III main chaetotaxy similar, with 3+3 chaetae on a series (a1, a4 and a6) and 5+5 on p series (p1–2, p4–p6); Abd. IV main chaetotaxy with the same chaetae, but with a4 as mesochaeta, internal or just above p4; a2 absent in Abd. I–IV; Abd. I–IV long sensilla as p5 (Fig. 8). Abd. V with 2+2 chaetae on a series (a1 and a4) and 3+3 on p series (p1, p2 and p4), long sensilla as p2 (Fig. 8). Abd. VI with unpaired mesochaeta p0 (Fig. 8).

Trunk appendages and ventral abdomen ( Figs 9–16View FIGURES 9–16). Chaetotaxy of legs I–III: Scx. I: 1/2/2; Scx. II: 0/2/2; Cx. 2–3/5/7; Tr. 6/6/6; Fe. 12/11/10; Tita 19/19/18 ( Figs 9–11View FIGURES 9–16); Tita chaeta M present, aligned to B series or slightly more proximal ( Figs 10–11View FIGURES 9–16). Ungues with a single median inner tooth; anterior and posterior pretarsal chaetae present ( Figs 9–11View FIGURES 9–16). Ventral tube with 3+3 chaetae ( Fig. 16View FIGURES 9–16). Tenaculum with 3 teeth on each ramus ( Fig. 12View FIGURES 9–16). Manubrium with 11+11 chaetae, 3 chaetae (2 external and 1 internal) present or absent in different specimens ( Fig. 16View FIGURES 9–16). Furca well developed, dens with 5–7 dorsal chaetae, 2–3 chaetae slightly longer than others (one proximal-external, one subdistal, if present and one distal) ( Fig. 14View FIGURES 9–16). Mucro tapering at the apex, average ratio mucro: dens = 1: 2,3 ( Fig. 14View FIGURES 9–16). Abdominal segments I–V ventrally with 1/3/8/3/6 chaetae by half body respectively, excluding genital plates ( Fig. 16View FIGURES 9–16). Male’s genital plate with about 21 chaetae, eugenital chaetae not differentiated ( Fig. 13View FIGURES 9–16), female’s genital plate with about 4 smaller eugenital plus 8 regular genital chaetae. Paired ventral anal valves with 15–16 ordinary chaetae plus 2 hr microchaetae each; unpaired dorsal anal valve with 13–15 ordinary chaetae (including p0) plus 2 hr microchaetae (Figs 8, 15).

Etymology. The new species name honors the memory of our dear friend Dr. Ricardo Andreazze, a cherished professor and entomologist at UFRN who recently passed away.

Distribution and Habitat. Specimens of Aethiopella ricardoi  sp. nov. were collected at the beginning of rainy season in Lagoa Redonda Farm, Nísia Floresta municipality, Rio Grande do Norte State, Brazil, with pitfall traps installed in sandy soil surrounded by dead foliage near vegetation and lentic freshwater. This is a coastland area about 9 km far from the seashore which presents some spots of primary forest. Climate is “As” sensu the Köppen-Geiger climate classification, meaning an equatorial main climate with dry summer ( Kottek et al. 2006). The new species was only found in the type locality until this moment.

Remarks. Aethiopella ricardoi  sp. nov. resembles other Neotropical taxa as Aethiopella caraibensis  , A. delamarei  , A. littoralis  and A. pilarandresae  by Ant. IV with trilobed apical bulb and 7 dorsal sensilla (except for A. delamarei  , which description lacks the number of dorsal sensilla), Th. I with 2+2 chaetae and dens with 5–7 chaetae (6 in all other compared species). However, the new species is unique by the combination of PAO with 13–19 vesicles (20–27 in A. pilarandresae  and about 36 A. caraibensis  ), mandibles with 7–8 teeth (6 in A. caraibensis  and A. pilarandresae  , 4 in A. delamarei  , 9–10 in A. littoralis  ), 19/19/18 chaetae respectively on Tita I–III (18/18/ 17 in A. littoralis  , unknown in A. caraibensis  and A. delamarei  ) and males lacking modified eugenital chaetae (with such chaetae in A. littoralis  , unknown in A. caraibensis  and A. delamarei  ).

Despite the already mentioned differences, it must be remarked that A. littoralis  and the new species Aethiopella ricardoi  sp. nov. present a strikingly similar body chaetotaxic pattern, with a noteworthy heterochaetosis. In this sense both display the pattern of Handschinurida Queiroz, 2015 group of genera sensu Queiroz & Zeppelini, 2017 on head and body, except for Th. I with only 2+2 chaetae. In addition, they present a similar number of PAO vesicles (13–15 for the first and 13–19 for the latter); regarding mandibles, despite a slight difference in number of apical teeth, their general shape is similar, with three strong basal teeth and smaller apical ones. The same is true regarding Ant. III–IV chaetotaxy, for which both also present the pattern of Handschinurida group. The absence of M chaeta on tibiotarsi of A. littoralis  is the most striking difference in relation to Aethiopella ricardoi  sp. nov. Otherwise, the position of M chaeta aligned to B row of chaetae in the new species is not fully in accordance to the basally displacement seen on other genera of the Handschinurida group. Further comparisons among Aethiopella  species are summarized in Table I.


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