Vol. 61, 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
Luísa Antônia Campos Barros1,*,§, Júlio Cezar Mário Chaul2,§,
Gisele Amaro Teixeira3,
Rodrigo Batista Lod1,
and Hilton Jeferson Alves Cardoso de Aguiar1,5
Federal do Amapá, Campus Binacional, Oiapoque, Amapá, Brazil.
*Correspondence: E-mail: firstname.lastname@example.org (Barros).
E-mail: email@example.com (Lod)
2Programa de Pós-graduação em Ecologia, Universidade
Federal de Viçosa, Viçosa, Minas Gerais, Brazil. E-mail:
3Programa de Pós-graduação em Biologia Celular e
Estrutural, Universidade Federal de Viçosa, Viçosa, Minas Gerais,
Brazil. E-mail: firstname.lastname@example.org (Teixeira)
4CNRS, UMR EcoFoG, AgroParisTech, CIRAD, INRAE,
Université de Guyane, Université des Antilles, Campus Agronomique, BP
316, 97379, Kourou Cedex, France. E-mail: email@example.com
5Programa de Pós-graduação em Biodiversidade Tropical,
Universidade Federal do Amapá, Macapá, Brazil. E-mail: firstname.lastname@example.org
§LACB and JCMC contributed
equally to this work.
Received 9 November 2021 / Accepted 13 April 2022
Communicated by John Wang
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.