Aethiopella ricardoi, Paz & Queiroz & Bellini, 2019

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

publication ID

https://doi.org/10.11646/zootaxa.4629.1.3

publication LSID

lsid:zoobank.org:pub:774D6EFF-23C6-4F09-9822-11DD48A41AB3

DOI

http://doi.org/10.5281/zenodo.5662696

persistent identifier

http://treatment.plazi.org/id/B1207C75-FF9B-A27F-59BC-7FD4FDF9F847

treatment provided by

Plazi

scientific name

Aethiopella ricardoi
status

sp. nov.

Aethiopella ricardoi   sp. nov.

Figs 1–16 View FIGURE 1 View FIGURES 2–6 View FIGURE 7 View FIGURES 9–16 , Table 1 View 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 holotype GoogleMaps   ; 2 males and 2 females collected in the same locality of the holotype, but during 16-18-vi-2018 GoogleMaps   . Paratypes deposited in CC / MNRJ: 2 females and 1 male collected in the same locality of the holotype, but during 16-18-vi-2018 GoogleMaps   ; 2 females collected in the same locality of the holotype, but during 13-15-iv-2018 GoogleMaps   .

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. 1 View 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 2–7 View FIGURES 2–6 View 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 2–3 View FIGURES 2–6 ). Ant. III and IV fused dorsally, ventral separation marked ( Fig. 3 View 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 2–3 View FIGURES 2–6 ). Ant. I and II with 7 and 11 chaetae, respectively ( Fig. 2 View FIGURES 2–6 ). Mandible with 7–8 teeth, 3 basal larger plus 4–5 smaller apical teeth ( Fig. 4 View FIGURES 2–6 ). Maxilla capitulum styliform with two partially fused lamellae, apically the external one discretely curved outside (hooked) ( Fig. 5 View 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. 6 View FIGURES 2–6 ). Eyes 8+8, subequal lenses, with 3 interocular chaetae (oc1–oc3) ( Fig. 7 View FIGURE 7 ). PAO moruliform, larger than ocellus A, bearing 13–19 vesicles ( Fig. 7 View 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. 7 View FIGURE 7 , white arrows).

Trunk dorsal chaetotaxy ( Figs 7 View 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 7 View 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. 7 View 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 9–16 View 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 9–11 View FIGURES 9–16 ); Tita chaeta M present, aligned to B series or slightly more proximal ( Figs 10–11 View FIGURES 9–16 ). Ungues with a single median inner tooth; anterior and posterior pretarsal chaetae present ( Figs 9–11 View FIGURES 9–16 ). Ventral tube with 3+3 chaetae ( Fig. 16 View FIGURES 9–16 ). Tenaculum with 3 teeth on each ramus ( Fig. 12 View FIGURES 9–16 ). Manubrium with 11+11 chaetae, 3 chaetae (2 external and 1 internal) present or absent in different specimens ( Fig. 16 View 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. 14 View FIGURES 9–16 ). Mucro tapering at the apex, average ratio mucro: dens = 1: 2,3 ( Fig. 14 View FIGURES 9–16 ). Abdominal segments I–V ventrally with 1/3/8/3/6 chaetae by half body respectively, excluding genital plates ( Fig. 16 View FIGURES 9–16 ). Male’s genital plate with about 21 chaetae, eugenital chaetae not differentiated ( Fig. 13 View 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.

CC

CSIRO Canberra Rhizobium Collection

MNRJ

Museu Nacional/Universidade Federal de Rio de Janeiro