Tyrannoseira sex Bellini & Zeppelini 2011, n. sp.
Creators: name: Bellini, Bruno Cavalcante
name: Zeppelini, Douglas
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Entognatha
Collembola
Entomobryidae
Tyrannoseira
Tyrannoseira sex

description: Tyrannoseira sex n. sp.
(Figs 4-6)
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.
DESCRIPTION
Total length of the holotype 1.58 mm. Habitus typically entomobryid (Fig. 4A). Color of mounted specimens pale yellow, with light blue pigment covering the antennae and dark blue pigment covering eyepatches and labrum area (Fig. 4A). 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). Eyepatches oval, 8 + 8 lenses, biggest lens B and smallest lens G, two interocular feathered mesochaetae and two interocular macrochaetae (Fig. 4C). Pre-labral and labral setae feathered. Labral papillae as show in Figure 4D. Labial triangle seta r reduced M1, M2 and E feathered (Fig. 4E). Femur of the first pair of legs heavily broadened in males, bearing 10 strong spines (Fig. 4F). Male tibiotarsus of first pair of legs apically slender with one row of 10 elongated spine-like setae (Fig. 4G). Trochanteral organ V- shaped with approximately 23 short spine-like setae (Fig. 4H). All ungues with four inner teeth, one pair at the base and two distal unpaired teeth (Fig. 4I). Unguiculi acuminate, with slightly serrated edges (Figs 4I). 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). No macrochaeta on first abdominal segment of adults, dorsal chaetotaxy of second and third abdominal segments as shown in Figure 5. Dorsal macrochaetae distribution on head and body as in Figure 6. Other characters are listed in Table 1.
DISCUSSION
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). 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). Other characteristics of Tyrannoseira n. gen. species are compared in Table 1 and in the following key.
description: Published as part of Bellini, Bruno Cavalcante & Zeppelini, Douglas, 2011, New genus and species of Seirini (Collembola, Entomobryidae) from Caatinga Biome, Northeastern Brazil, pp. 545-555 in Zoosystema 33 (4) on pages 553-554, DOI: 10.5252/z2011n4a6, http://zenodo.org/record/2645192