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RESEARCH ARTICLE (Open Access)

A remarkable troglomorphic ant, Yavnella laventa sp. nov. (Hymenoptera: Formicidae: Leptanillinae), identified as the first known worker of Yavnella Kugler by phylogenomic inference

Zachary Hayes Griebenow https://orcid.org/0000-0003-3385-8479 A * , Marco Isaia https://orcid.org/0000-0001-5434-2127 B and Majid Moradmand https://orcid.org/0000-0001-8596-8448 C
+ Author Affiliations
- Author Affiliations

A Department of Entomology and Nematology, University of California, Davis, CA, USA.

B Laboratorio di Ecologia, Ecosistemi terrestri, Dipartimento di Scienze della Vita e Biologia dei Sistemi, Università di Torino, Torino, Italy.

C Department of Plant and Animal Biology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran.

* Correspondence to: zgriebenow@ucdavis.edu

Handling Editor: Prashant Sharma

Invertebrate Systematics 36(12) 1118-1138 https://doi.org/10.1071/IS22035
Submitted: 21 July 2022  Accepted: 27 October 2022   Published: 5 December 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

The ant subfamily Leptanillinae (Hymenoptera: Formicidae) consists of minute soil-dwelling species, with several genera within this clade being based solely upon males, including Yavnella Kugler. The dissociation of males and workers has resulted in taxonomic confusion for the Leptanillinae. We here describe the worker caste of Yavnella, facilitated by maximum-likelihood and Bayesian inference from 473 partitioned ultra-conserved element loci, this dataset including 49 other leptanilline species, both described and undescribed. Yavnella laventa sp. nov. is described from seven worker specimens collected in south-western Iran from the Milieu Souterrain Superficiel, a subterranean microhabitat consisting of air-filled cavities among rock and soil fragments, which is subject to similar environmental conditions as caves. This species has bizarrely elongated appendages, which suggests that it is confined to cavities, in contrast with the soil-dwelling behaviour observed in other leptanilline ants. Based on its gracile phenotype relative to other Leptanillinae, Y. laventa shows remarkable adaptations for subterranean life, making it one of a very few examples of this syndrome among the ants. Moreover, the discovery of the worker caste of Yavnella expands our morphological knowledge of the leptanilline ants. We provide worker- and male-based diagnoses of Yavnella, along with a key to the genera of the Leptanillinae for which workers are known. The worker caste of Yavnella as known from this species is immediately recognisable, but the possibility must be noted that described workers of Leptanilla may in fact belong to Yavnella. Further molecular sampling is required to test this hypothesis.

ZooBank: urn:lsid:zoobank.org:pub:A54A5766-F35A-4074-9353-1C70FE3955D3

Keywords: Insecta, Iran, Milieu Souterrain Superficiel, molecular systematics, Palaearctic, phylogenomics, subterranean biology, troglomorphism.


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Unveiling the morphology of the Oriental rare monotypic ant genus Opamyrma Yamane, Bui & Eguchi, 2008 (Hymenoptera: Formicidae: Leptanillinae) and its evolutionary implications, with first descriptions of the male, larva, tentorium, and sting apparatus.Crossref | GoogleScholarGoogle Scholar |

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