Lyteba Thomson, 1859

Quadros, Alex Leite & Brandão, Carlos Roberto F., 2017, Genera of Belytinae (Hymenoptera: Diapriidae) recorded in the Atlantic Dense Ombrophilous Forest from Paraíba to Santa Catarina, Brazil, Papéis Avulsos de Zoologia (São Paulo) 57 (6), pp. 57-91: 65-66

publication ID 10.11606/0031-1049.2017.57.06

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Lyteba Thomson, 1859


Lyteba Thomson, 1859   (= Oxylabis   auct., nec Förster 1856)

( Figs. 3 View FIGURE 3 , 5 View FIGURE 5 C-D, 14A, 23B)

Total of specimens found: 38 (16 females and 22 males) in five morphospecies.

Diagnosis: Mostly relatively medium-sized (2-4 mm); occipital carina complete; hypostomal bridge narrow; posterior keel of toruli medially produced; antenna 15-segmented in females ( Fig. 3E View FIGURE 3 ), 14-segmented in males. Mesosoma wider than high; presence of teeth, one on each scutellar bridge, near the posterolateral margin of the scutellar fovea ( Fig. 3C View FIGURE 3 ); lateral fovea smooth with dense pubescence ( Fig. 3D View FIGURE 3 ); metascutellum as a tubercle or spine in lateral view ( Fig. 14A View FIGURE 14 ). Forewing densely pubescent; Radial cell of forewings open ( Fig. 5C View FIGURE 5 ) and in some species the Rs3 continues as a weak trail that reaches the anterior margin of the wing ( Fig. 5D View FIGURE 5 ); stigmal vein almost perpendicular to the marginal vein ( Figs. 5 View FIGURE 5 C-D); marginal vein longer than parastigma ( Figs. 5 View FIGURE 5 C-D). Petiole relatively short ( Fig. 3B View FIGURE 3 ) and at least as long as wide; basal sculpture of macrotergite with long medial furrow and short lateral striation; ovipositor short.

Material examined: BRAZIL: Santa Catarina: São Bento do Sul, CEPA Rugendas , 26°19’25.6”S, 49°18’26.5”W, 13-16.x.2001 (4), 16-19.x.2001 (2), 15.x.2001, A.M. Penteado-Dias e eq. col GoogleMaps   .,

2 ♀♀ / 5 ♂♂; São Francisco do Sul , CEPA Vila da Glória, 26°13’40.0”S, 48°40’49.1”W, 14-17.x.2001, 17-20.x.2001, A.M. Penteado-Dias e eq. col GoogleMaps   ., 2 ♀♀; São Paulo : Base Barra Grande, Parque Estadual de Intervales, 24°18’14.4”S, 48°21’50.4”W, 10-13. xii.2000 (6), 11-14.xii.2000 (3), 14-17.xii.2000 (2), 12.xii.2000 (2), 13.xii.2000 (5), M. T. Tavares e eq. col GoogleMaps   ., 8 ♀♀ / 10 ♂♂; Salesópolis , Estação Biológica de Boracéia, 23°39’01.8”S, 45°52’55.5”W, 04.iv.2001, S. T. P. Amarante e eq. col GoogleMaps   ., 1 ♂; Rio de Janeiro : Nova Iguaçu, Reserva Biológica do Tinguá, 22°34’32”S, 43°26’09”W, 09-12.iii.2002, S. T. P. Amarante e eq. col GoogleMaps   ., 1 ♂; Santa Maria Madalena , Parque Estadual do Desengano, 21°59’03.9”S, 41°57’08.4”W, 16-19.iv.2002 (4), 19-22.iv.2002 (2), 18.iv.2002, A.M. Penteado-Dias e eq. col GoogleMaps   ., 2 ♀♀ / 5 ♂♂; Espírito Santo : Santa Teresa, Estação Biológica de Santa Lúcia, 19°58’16.7”S, 40°32’06.9”W, 06-09.iv.2001, C.O. Azevedo e eq. col GoogleMaps   ., 1 ♀; Alagoas : Quebrangulo, Reserva Biológica Pedra Talhada, 09°18’57.6”S, 36°27’57.6”W, 11-14.ix.2002, A.M. Penteado-Dias e eq. col GoogleMaps   ., 1 ♀. A.L. Quadros det.

Remarks: The name Lyteba   was proposed by Thomson (1859) for Belyta bisulca Nees, 1834   . Marshall (1873) synonymized Lyteba   under Oxylabis Förster, 1856   . Apparently, Förster (1856) published the original diagnosis of Oxylabis   without having seen any of the Nees species, Oxylabis picipes   (Nees ab Esenbeck, 1834) and Oxylabis jurini   (Nees ab Esenbeck, 1834), which he originally included in his genus Oxylabis   . The disputable presence of the metascutellum spine as stated in the Nees’ brief diagnosis of O. picipes   was the main character upon which Förster (1856) based his Oxylabis   , and it became the main diagnosis character of Oxylabis   henceforth accepted by later authors. Consequently, some of the authors assigned to Oxylabis   other species possessing this character state, including some species of Pantoclis Förster, 1856   with closed radial cell. However, comparative analysis on the frequency of this character within other Belytinae   evinced the presence of the metascutellum spine in other unrelated species, thus proving its homoplastic status in Belytinae ( Macek, 1995)   . Furthermore, there is a high rate of variation in the development of the metascutellum spine in Lyteba bisulca   (Nees ab Esenbeck, 1834), in which this structure is either reduced to a mere tubercle or missing at all ( Macek, 1995). Kieffer (1916) recognized 25 species of Oxylabis   (18 Palearctic; 6 Nearctic; 1 Neotropical). Nixon (1957) keyed out four European species. Johnson (1992) listed 37 Lyteba   species names in total, including Oxylabis neotropica Kieffer, 1909   , the only species officially recorded in the Neotropics (Mapiri, Bolivia). Macek (1995) revised and keyed out the West Palearctic species and recognized only four Lyteba   species: L. bisulca   (Nees ab Esenbeck, 1834), L. canaliculata (Kieffer, 1907)   , L. carinifrons ( Kieffer, 1909)   and L. pectinifer Macek, 1995   ; many nominal species in Johnson’s catalogue were synonymized by Macek (1995) with L. bisulca   and one of them with L. canaliculata   .

Distribution: Holarctic, Oriental and the Neotropics ( Macek, 1995). In our study, the genus was recorded in Alagoas state and from Santa Catarina to Espírito Santo ( Fig. 23B View FIGURE 23 ).

Biology: Nothing is known about Lyteba   hosts. Adults may be encountered from spring to autumn with at least one species ( L. bisulca Nees   ab Esenbeck, 1834) probably overwintering in the adult stage ( Macek, 1995).


Tavera, Department of Geology and Geophysics