Cryptic diversity down under: defining species in the subterranean amphipod genus Nedsia Barnard & Williams, 1995 (Hadzioidea: Eriopisidae) from the Pilbara, Western Australia
Rachael A. King
A B * , Erinn P. Fagan-Jeffries A B , Tessa M. Bradford A B , Danielle N. Stringer A B , Terrie L. Finston C , Stuart A. Halse D , Stefan M. Eberhard E , Garth Humphreys C F G , Bill F. Humphreys C G , Andrew D. Austin A B and Steven J. B. Cooper A B
+ Author Affiliations
- Author Affiliations
A South Australian Museum, North Terrace, Adelaide, SA 5000, Australia.
B Australian Centre for Evolutionary Biology and Biodiversity and School of Biological Sciences, University of Adelaide, SA 5005, Australia.
C School of Animal Biology, The University of Western Australia, Crawley, WA 6009, Australia.
D Bennelongia Environmental Consultants, PO Box 384, Wembley, WA 6913, Australia.
E Subterranean Ecology Pty Ltd, 227 Coningham Road, Coningham, Tas. 7054, Australia.
F Biota Environmental Sciences Pty Ltd, PO Box 155, Leederville, WA 6903, Australia.
G Western Australian Museum, Locked Bag 40, Welshpool DC, WA 6986, Australia.
Invertebrate Systematics 36(2) 113-159 https://doi.org/10.1071/IS21041
Submitted: 25 May 2021 Accepted: 17 September 2021 Published: 18 February 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
Amphipod crustaceans comprise a significant and enigmatic component of Australian groundwater ecosystems, particularly in the Pilbara region of Western Australia. Many amphipod species in the Pilbara, including species in the genus Nedsia Barnard & Williams, 1995, are considered short range endemics, poorly or contentiously defined by taxonomic treatments based on morphology alone and have uncertain distributions as a consequence of this taxonomy. A modern systematic revision of Nedsia is presented here, utilising both molecular and morphological analyses alongside distributional data to delineate species. We describe 13 new species of Nedsia, confirm three existing species and synonymise eight previously described species. Nedsia species are confirmed to be functionally morphologically cryptic, with COI divergences at the 5–20% level. We present comparatively reduced taxonomic descriptions for these cryptic amphipod species in an effort to provide an accelerated pathway for future taxonomic work. The research provides the basis for future environmental impact assessments involving Nedsia species and ongoing monitoring of the groundwater communities these form part of in the resource-rich Pilbara region.
Keywords: Amphipoda, classification, cryptic species, Eriopisidae, groundwater, phylogenetics, stygofauna, taxonomy.
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