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

Integrative species delimitation reveals fine-scale allopatric speciation in a good-flying insect: a case study on Cylindera pseudocylindriformis complex (Coleoptera, Cicindelidae)

Ming-Hsun Chou https://orcid.org/0000-0002-7426-0257 A * , I-Hsuan Chu B , Daniel Lau B and Jen-Pan Huang https://orcid.org/0000-0002-9329-8867 A *
+ Author Affiliations
- Author Affiliations

A Biodiversity Research Center, Academia Sinica, Taipei, Taiwan.

B Department of Entomology, National Chung Hsing University, Taichung, Taiwan.


Handling Editor: Bruno de Medeiros

Invertebrate Systematics 36(10) 910-925 https://doi.org/10.1071/IS22011
Submitted: 14 February 2022  Accepted: 2 August 2022   Published: 6 October 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing.

Abstract

Alpha taxonomy is fundamental for many biological fields. Delineation of the species boundary, however, can be challenging in a species complex, where different species share a similar morphology and diagnostic characters may not be available. In this context, integrative approaches that incorporate molecular and morphological data sets, and account for speciation history can be helpful to alpha taxonomy. Different approaches to species delimitation based on different assumptions are complementary and by integrating the results from multiple approaches we can generate a more reliable and objective taxonomic decision. In this study, we applied three molecular approaches to species delimitation and inferred the demographic history based on an isolation with migration model to test a morphologically based taxonomic hypothesis for the Cylindera pseudocylindriformis complex. We discuss the association between genetic divergence and microhabitat specialisation, and further corroborate that C. subtilis sp. nov. is a valid new species by integrating the results from model-based species delimitation and the genealogical divergence index. We argue that genetic endemism can occur at a small geographic scale, even in a winged insect like tiger beetles. Our results also indicated that there may still be undocumented species diversity of Taiwanese Cylindera remaining to be discovered.

ZooBank LSID: urn:lsid:zoobank.org:pub:9DEC1432-365C-4872-8D06-73B95F30624F

Keywords: alpha taxonomy, cryptic diversity, dispersal, GDI, genealogical divergence index, microhabitat, Taiwan, tiger beetle, unified species concept.


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