Zoological Studies

Vol. 61, 2022

(update: 2022.5.16)

First Report of the Tramp ant Technomyrmex vitiensis Mann, 1921 (Formicidae: Dolichoderinae) in Brazil with Cytogenetic and Sperm Structure Data and an Updated Key to Brazilian Dolichoderinae Genera

Luísa Antônia Campos Barros1,*, Júlio Cezar Mário Chaul2,§, Gisele Amaro Teixeira3, Rodrigo Batista Lod1, Jérôme Orivel4, and Hilton Jeferson Alves Cardoso de Aguiar1,5

1Universidade Federal do Amapá, Campus Binacional, Oiapoque, Amapá, Brazil. *Correspondence: E-mail: luufv@yahoo.com.br (Barros).
E-mail: lod.batista@gmail.com (Lod)
2Programa de Pós-graduação em Ecologia, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil. E-mail: juliocchaul@gmail.com (Chaul)
3Programa de Pós-graduação em Biologia Celular e Estrutural, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil. E-mail: g.amaroteixeira@gmail.com (Teixeira)
4CNRS, UMR EcoFoG, AgroParisTech, CIRAD, INRAE, Université de Guyane, Université des Antilles, Campus Agronomique, BP 316, 97379, Kourou Cedex, France. E-mail: jerome.orivel@ecofog.gf (Orivel)
5Programa de Pós-graduação em Biodiversidade Tropical, Universidade Federal do Amapá, Macapá, Brazil. E-mail: hilton@unifap.br (Aguiar)

§LACB and JCMC contributed equally to this work.
Received 9 November 2021 / Accepted 13 April 2022
Communicated by John Wang

Invasive ants are usually harmful taxa and considered a potential problem to biodiversity due to their negative ecological impacts, as they can exclude native ant species. Ten such species are reported for Brazil. In this study, we report for the first time the Asian tramp ant Technomyrmex vitiensis Mann, 1921 at the municipality of Oiapoque, in the Brazilian Amazon. The studied colony contained workers, intercastes, males and larvae and provided sperm structure and cytogenetic data. Considering the unprecedented report of the genus Technomyrmex as well as the recent finding of the primarily Australian genus Leptomyrmex in Brazil, we present a revised key for the workers of Brazilian Dolichoderinae genera. Technomyrmex vitiensis presented 2n = 16 chromosomes, all metacentrics and comparative cytogenetics in the genus is provided. A single rDNA 18S site located in intrachromosomal region was observed in this species, which is a common trait in ants. The spermatozoa of T. vitiensis showed filiform shape, with 78.13 (± 1.96) µm of total length and 11.43(± 0.51) µm of nucleus length. Total and nucleus sperm size length fit with the known variation observed in other ant species. The occurrence of T. vitiensis in Brazil is probably a result of traffic between French Guiana and the Amapá state. Cytogenetic and sperm structure of T. vitiensis enhance the biological knowledge of this tramp species. We highlight the scarce knowledge of ant diversity in the state of Amapá and the potential consequences of the presence of the species in the region.

Key words: Amazon, Biogeography, Invasive ant, Karyotype, Spermatozoa, Guiana shield.

Citation:Barros LAC, Chaul JCM, Teixeira GA, Lod RB, Orivel J, Aguiar HJAC. 2022. First report of the tramp ant Technomyrmex vitiensis Mann, 1921 (Formicidae: Dolichoderinae) in Brazil with cytogenetic and sperm structure data and an updated key to Brazilian Dolichoderinae genera. Zool Stud 61:29.

Supplementary materials: Supplementary materials