Tyrannoseira gladiata , Zeppelini, Douglas & Lima, Estevam Cipriano Araujo De, 2012

Zeppelini, Douglas & Lima, Estevam Cipriano Araujo De, 2012, A new species of Tyrannoseira (Collembola, Entomobryidae, Seirini) from Paraiba, Northeastern Brazil, Zootaxa 3423, pp. 36-44: 37-42

publication ID

http://doi.org/ 10.5281/zenodo.211656



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scientific name

Tyrannoseira gladiata

sp. nov.

Tyrannoseira gladiata  sp. nov.

Figs 1–18View FIGURES 1 – 2View FIGURES 3 – 4View FIGURES 5 – 11View FIGURES 12 – 16View FIGURE 17View FIGURE 18, Tables 1 & 2

Type material. Brazil: Paraíba, Araruna, State Park Pedra da Boca, 21.V. 2011, D. D. Silva Coll., holotype male, 11 paratypes (3 male, 8 female) same data as Holotype, deposited at Museu Nacional, Universidade Federal do Rio de Janeiro (CM/ MNRJ # 2294).

Etymology. The species was named as reference to the shape of the spine-like setae on first tibiotarsus of adult males, which resemble the ancient roman sword.

Distribution. The species is known only from type locality, Good’s biogeographic zone 27 ( Good 1974).

Habitat. Tyrannoseira gladiata  sp. nov. is found in a region transitioning from Atlantic Forest, a semideciduous wet forest, to Caatinga, semi-arid xeromorphic savanna, this transitional vegetation and elevated landscape is called “ Brejo de Altitude”. The whole area is an elevation that borders the littoral flat. The climate of the area is “ As ”( Koeppen 1948; Kottek et al. 2006), tropical hot (annual average over 18 C) with dry summer (less than 60mm at least two months along the summer season) and the vegetation is composed of medium sized trees mixed with areas of typical Caatinga forest ( Beltrão e t al. 2005). The individuals live on the topsoil and leaf litter along the margins of patches of open rock. The animals alternate activities in both parts of the habitat. Early in the morning they are less active and stand for sometime or move slowly on the open rock, as the temperature rises they move around the border between leaf litter and open rock environment. The behavior of this species is very similar to that of T. raptora ( Zeppelini & Bellini 2006), foraging and using the armed fore legs to fight for food resources and females ( Zeppelini & Bellini 2006; Bellini & Zeppelini 2011), even though no agonistic behavior was observed in field conditions for T. gladiata  sp. nov.

Description. Total length of holotype 2.1 mm, body measures shown in Table 1. Habitus typical entomobryid ( Fig. 1View FIGURES 1 – 2). Color in alcohol, dark brown all over head, body and coxae, eye patches darker. Legs, furca, Ant I and basal halves of Ant. II –IV whitish yellow ( Fig. 1View FIGURES 1 – 2). Brownish rounded scales covering head, thorax, abdomen, legs, antennal segments I and II, and basal half of Ant. III, no scales on Ant. IV. Ventral tube without scales.

Fourth antennal segment not annulated, with a single apical bulb, without pin setae ( Fig. 2View FIGURES 1 – 2). Eye patches oval, 8 + 8 lenses, biggest lens B, smallest and subequal lenses G and H, four interocular feathered mesochaetae and one interocular macrochaetae ( Fig. 3View FIGURES 3 – 4). Pre-labral and labral setae feathered. Labial triangle seta R not differentiated from other setae, M 1–2, R, E 1 and L 1-2, all feathered and subequal in size ( Fig. 4View FIGURES 3 – 4).

Prothoracic femur in males strongly broadened, bearing 13 or more stout spines ( Figs. 5View FIGURES 5 – 11, 12- 14View FIGURES 12 – 16). Prothoracic tibiotarsus in males slender, curved at base, obliquely articulated to femur, bearing one row of 11–13 elongated spine-like setae ( Figs 6View FIGURES 5 – 11, 12, 15, 16View FIGURES 12 – 16). Trochanteral organ formed by 16 short setae ( Fig. 7View FIGURES 5 – 11). All ungues with four inner teeth, basal teeth paired, two unpaired distal teeth ( Fig. 8–10View FIGURES 5 – 11), and with a dorsal tooth on the basal external lamella. Unguiculi lanceolate ( Figs 8–10View FIGURES 5 – 11), inner lamella of hind unguiculi with small teeth or weakly serrate. Tenent hair flat, capitate and smooth. Venter of manubrium with 5 + 5 subapical ciliated setae on a transversal line. Manubrium without spine-like setae. Mucro falcate, without basal spine ( Fig. 11View FIGURES 5 – 11). No macrochaeta on first abdominal segment of adults, dorsal macrochaetae of head and body distributed as shown in Fig. 17View FIGURE 17. Chaetotaxy of the trichobothrial region of Abd. II and III shown in Figure 18View FIGURE 18. Other characters are listed in Table 2.

Remarks. T. gladiata  sp. nov. can be differentiated by the Ant/CD ratio (2.9), which is the highest among the five described species ( Table 2), the presence of only two macrochaetae on region A ( Christiansen & Bellinger 2000) of Abd. II, the antenna almost as long as the body length, the chaetotaxy of the fields 5 and 6 on posterior dorsal head, 16 setae on metatrochanteral organ and the color pattern. The new species resembles T. diabolica Bellini & Godeiro, 2012 in the number of ventral setae on the manubrial apex.

Four species of the genus Seira  are included in Table 2 for comparison, S. mirianae Arlé & Guimarães 1981  , S. yemensis Barra 2004  , S. andensis Jacquemart 1980  because they share the absence of macrochaetae on Abd. I and S. mantis Zeppelini & Bellini 2006  because of its sexual dimorphism. The species T. raptora, T. bicolorcornuta ( Bellini et al. 2009), T. sex Bellini & Zeppelini 2011 and T. diabolica are also compared.

TABLE 1. Length of the body segments of the holotype, antenna and head of Tyrannoseira gladiata sp. nov. Abd—abdominal segment, Ant—antennal segment, CD – cephalic diagonal. Measures given in μm.

Body segment T. gladiata  sp. nov.
Ant IV 312.87
Ant III 237.18
Ant II 232.97
Ant I 120.12
Head 268.8
CD 311.65
Mesothorax 175.65
Metathorax 162.48
Abd I 135.8
Abd II 113.43
Abd III 183.68
Abd IV 539.41
Abd V 136.51
Abd VI 56.44
Manubrium 376.21
Dens 399.89
Mucro 19.71
Body lenght 2,100

Museu Nacional/Universidade Federal de Rio de Janeiro