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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

TitreWhen 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
Type de publicationJournal Article
Year of Publication2017
Auteursde Mazancourt, V, Marquet, G, Klotz, W, Keith, P, Castelin, M
JournalInvertebrate Systematics
Volume31
Pagination220-230
Date Published01/2017
Mots-clés16S., freshwater shrimp, Indo-Pacific, Integrative taxonomy
Résumé

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.Wecombined 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.