When molecules and morphology work together: lines of evidence for the validity of Caridina buehleri Roux (Crustacea : Decapoda : Atyidae) and for C. gueryi Marquet, Keith & Kalfatak as its junior synonym
Valentin de Mazancourt A D , Gerard Marquet A , Werner Klotz B , Philippe Keith A and Magalie Castelin A C
+ Author Affiliations
- Author Affiliations
A Muséum national d’Histoire naturelle, DMPA, UMR 7208, CP026, 57, Rue Cuvier, F-75231 Paris, Cedex 05, France.
B Wiesenweg 1, A-6063 Rum, Austria.
C Aquatic Animal Health Section, Fisheries and Oceans Canada, Pacific Biological Station, 3190 Hammond Bay Road, Nanaimo, BC V9T 6N7, Canada.
D Corresponding author. Email: valentin.demazancourt@laposte.net
Invertebrate Systematics 31(2) 220-230 https://doi.org/10.1071/IS16044
Submitted: 4 June 2016 Accepted: 28 November 2016 Published: 26 April 2017
Abstract
The taxonomy of the freshwater shrimps Caridina (Atyidae) is very complex and confused mostly because the morphological characters that have traditionally been used for species delimitation and identification are highly plastic. There is thus a need for an integrative approach to their taxonomy. In total, 42 specimens belonging to either Caridina buehleri Roux, 1934 or Caridina gueryi Marquet, Keith & Kalfatak, 2009 were examined. We combined here morphological data from 12 specimens from the whole distributional range of the species, including type specimens with 16S mtDNA analyses from seven freshly sampled specimens, to verify the specific status of Caridina buehleri from Papua New-Guinea, Central Sulawesi, Western Samoa and the Solomon Islands, and C. gueryi from Vanuatu. The comparison of 24 morphological characters showed that morphological variations of character traits between C. gueryi and C. buehleri are widely overlapping and that no morphological feature can effectively split specimens into two clear groups. Molecular characters corroborated these results, as specimens from both groups were only separated by a 2% p-distance, a genetic distance that is coherent with their potentially high dispersal abilities. We thus consider C. gueryi as a junior synonym of C. buehleri. Finally, C. buehleri is characterised mainly by a styliform and characteristically indented rostrum and a long stylocerite. Detailed re-descriptions of the type specimens of C. buehleri and C. gueryi are given, as well as their geographical and ecological distribution.
Additional keywords: freshwater shrimp, Indo-Pacific, integrative taxonomy, 16S.
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