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Invertebrate Systematics Invertebrate Systematics Society
Systematics, phylogeny and biogeography
RESEARCH ARTICLE

Molecular phylogeny of the orb-weaving spider genus Leucauge and the intergeneric relationships of Leucauginae (Araneae, Tetragnathidae)

Jesús A. Ballesteros https://orcid.org/0000-0003-2315-2368 A B C and Gustavo Hormiga https://orcid.org/0000-0002-0046-1822 A
+ Author Affiliations
- Author Affiliations

A Department of Biological Sciences, The George Washington University, Washington, DC 20052, USA.Email: hormiga@gwu.edu

B Department of Integrative Biology, University of Wisconsin—Madison, Madison, WI 53706, USA.

C Corresponding author. Email: jeballes@kean.edu

Invertebrate Systematics 35(8) 922-939 https://doi.org/10.1071/IS21029
Submitted: 16 April 2021  Accepted: 8 June 2021   Published: 5 November 2021

Abstract

The tetragnathid genus Leucauge includes some of the most common orb-weaving spiders in the tropics. Although some species in this genus have attained relevance as model systems for several aspects of spider biology, our understanding of the generic diversity and evolutionary relationships among the species is poor. In this study we present the first attempt to determine the phylogenetic structure within Leucauge and the relationship of this genus with other genera of Leucauginae. This is based on DNA sequences from the five loci commonly used and Histone H4, used for the first time in spider phylogenetics. We also assess the informativeness of the standard markers and test for base composition biases in the dataset. Our results suggest that Leucauge is not monophyletic since species of the genera Opas, Opadometa, Mecynometa and Alcimosphenus are included within the current circumscription of the genus. Based on a phylogenetic re-circumscription of the genus to fulfil the requirement for monophyly of taxa, Leucauge White, 1841 is deemed to be a senior synonym of the genera Opas Pickard-Cambridge, 1896 revalidated synonymy, Mecynometa Simon, 1894 revalidated synonymy, Opadometa Archer, 1951 new synonymy and Alcimosphenus Simon, 1895 new synonymy. We identify groups of taxa critical for resolving relationships within Leucauginae and describe the limitations of the standard loci for accomplishing these resolutions.


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