Tyrannoseira sex, Bellini & Zeppelini, 2011

Bellini, Bruno Cavalcante & Zeppelini, Douglas, 2011, New genus and species of Seirini (Collembola, Entomobryidae) from Caatinga Biome, Northeastern Brazil, Zoosystema 33 (4), pp. 545-555: 553-554

publication ID

http://doi.org/ 10.5252/z2011n4a6



persistent identifier


treatment provided by


scientific name

Tyrannoseira sex

n. sp.

Tyrannoseira sex   n. sp.

( Figs 4-6 View FIG View FIG View FIG )

TYPE MATERIAL. — Brazil. Paraíba, São João do Cariri, Furna dos Ossos , 15-16.VI.2008, Farias, A.A. Coll, holotype ♂,   6 paratypes (5 ♀♀, 1 ♂) (2175, CM / MNRJ)   ; 2 paratypes (1 ♂, 1 ♀) ( EA010032, MNHN)   .

ETYMOLOGY. — The species was named after its sexual dimorphism.

DISTRIBUTION. — Good’s biogeographic zone 27 ( Good 1974).

HABITAT. — Tyrannoseira sex   n. sp. was collected in São João do Cariri municipality, about 200 km from João Pessoa, capital of Paraíba State, northeatern Brazil. The collections were made during the wet season (June 2008) inside an archeological site named “Furna dos Ossos”. The climate of the area is “As” following Koeppen’s system (Kottek et al. 2006) and the flora is hiperxerophytic with areas of typical Caatinga forest.


Total length of the holotype 1.58 mm. Habitus typically entomobryid ( Fig. 4A View FIG ). Color of mounted specimens pale yellow, with light blue pigment covering the antennae and dark blue pigment covering eyepatches and labrum area ( Fig. 4A View FIG ). Yellowish to brownish rounded scales covering head, thorax, abdomen, legs, antennal segments I and II, and basal halves of antennal segments III and IV.Ventral tube without scales. Fourth antennal segment not annulated, with a single apical bulb, without pin setae ( Fig. 4B View FIG ). Eyepatches oval, 8 + 8 lenses, biggest lens B and smallest lens G, two interocular feathered mesochaetae and two interocular macrochaetae ( Fig. 4C View FIG ). Pre-labral and labral setae feathered. Labral papillae as show in Figure 4D View FIG . Labial triangle seta r reduced M1, M2 and E feathered ( Fig. 4E View FIG ). Femur of the first pair of legs heavily broadened in males, bearing 10 strong spines ( Fig. 4F View FIG ). Male tibiotarsus of first pair of legs apically slender with one row of 10 elongated spine-like setae ( Fig. 4G View FIG ). Trochanteral organ V- shaped with approximately 23 short spine-like setae ( Fig. 4H View FIG ). All ungues with four inner teeth, one pair at the base and two distal unpaired teeth ( Fig. 4I View FIG ). Unguiculi acuminate, with slightly serrated edges ( Figs 4I View FIG ). Tenent hair capitate, slightly serrated at the edges. Venter of manubrium with 4 + 4 subapical multiciliated setae on a transversal line. No spine-like setae present on manubrium. Mucro typically falcate, without basal spine ( Fig. 4J View FIG ). No macrochaeta on first abdominal segment of adults, dorsal chaetotaxy of second and third abdominal segments as shown in Figure 5 View FIG . Dorsal macrochaetae distribution on head and body as in Figure 6 View FIG . Other characters are listed in Table 1.


The closest species to T. sex   n. sp. is T. raptora   n. comb. Both species share a similar shape of the first pair of legs on males, with heavily broadened femora against the weakly broadened femora seen in T. bicolorcornuta   n. comb. Tyrannoseira sex   n. sp. and T. raptora   n. comb. also share a similar overall dorsal chaetotaxy, especially on cephalic regions 2, 4 and anterior 6, mesothorax and abdominal segments I, II and III ( Figs 1; 6 View FIG View FIG ). The distribution of macrochaetae on the metathorax and the labial triangle chaetotaxy of T. sex   n. sp. is similar to those of T. bicolorcornuta   n. comb. However, T. sex   n. sp. can be clearly distinguished from both species by lacking body dark pigment, by the presence of broadened femora with only 10 spines, against 14 or more in T. raptora   n. comb., by the presence of only 2 + 2 macrochaetae on head’s posterior region 6 and by the pattern of macrochaetae on meso- and metathorax and abdominal segment IV ( Fig. 6 View FIG ). Other characteristics of Tyrannoseira   n. gen. species are compared in Table 1 View TABLE and in the following key.


Brazil, Rio de Janeiro, Sao Cristovao, Universidade do Rio Janeiro, Museu Nacional


France, Paris, Museum National d'Histoire Naturelle