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Systematics, phylogeny and biogeography
RESEARCH ARTICLE

Neolucia bollami Eastwood, Braby & Graham, sp. nov. (Lepidoptera: Lycaenidae): speciation of a new allochronic cryptic butterfly from south-western Western Australia

Rodney G. Eastwood https://orcid.org/0000-0001-5311-0367 A * , Michael F. Braby https://orcid.org/0000-0002-5438-587X B C and Matthew R. Williams D
+ Author Affiliations
- Author Affiliations

A Department of Terrestrial Zoology, Western Australian Museum, 49 Kew Street, Welshpool, WA 6106, Australia.

B Division of Ecology and Evolution, Research School of Biology, The Australian National University, Acton, ACT 2601, Australia.

C The Australian National Insect Collection, National Research Collections Australia, GPO Box 1700, Canberra, ACT 2601, Australia.

D Department of Biodiversity Conservation and Attractions, 17 Dick Perry Avenue, Kensington, WA 6151, Australia.

* Correspondence to: rodeastwood6@gmail.com

Handling Editor: Andy Austin

Invertebrate Systematics 37(8) 552-570 https://doi.org/10.1071/IS23009
Submitted: 16 March 2023  Accepted: 8 August 2023   Published: 6 September 2023

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing.

Abstract

South-western Western Australia is a global biodiversity hotspot renowned for exceptional diversity of plants and animals. The evolutionary processes that have generated this high biodiversity are not always clear, particularly for invertebrates, yet the area supports a very large number of endemic species that have diversified in situ. We use an integrative taxonomic approach based on adult and immature morphology, ecology, behaviour and molecular data to investigate the taxonomic status of a sympatric but seasonally isolated form (Neolucia agricola occidens Waterhouse & Lyell, 1914 form ‘Julimar’) of the polyommatine butterfly Neolucia agricola (Westwood, 1851) in south-western Western Australia. Our molecular dataset comprised 112 samples representing all Neolucia Waterhouse & Turner, 1905 species (100 COI 5′ sequences, 658 bp, plus 12 COI 3′, tRNA Leu, COII and EF1-α sequences, 3303 bp). Maximum likelihood phylogenetic analysis of the combined dataset recovered form ‘Julimar’ and N. agricola as reciprocally monophyletic, with a mean uncorrected ‘p’ pairwise divergence of 5.77% for the ‘barcode’ region of COI. Based on this and other evidence we recognise form ‘Julimar’ as a new species, Neolucia bollami Eastwood, Braby & Graham, sp. nov., sister to N. agricola and endemic to south-western Western Australia. As a result of these findings, we evaluated the evolutionary history of the two Neolucia species in WA and the processes that may have contributed to the diversification in sympatry or allopatry. We conclude that the multiple effect traits associated with a host shift, including host fidelity and temporal divergence, played an important role in the diversification process and in maintaining the reproductive integrity of the nascent allochronic species.

ZooBank: urn:lsid:zoobank.org:act:53D9AD14-9694-4B5E-889C-A8D533E7F57D

Keywords: allochronic speciation, Fabaceae, host fidelity, host plant shift, integrative taxonomy, magic traits, modes of diversification, South-West Australian Ecoregion, sympatric speciation.


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