%0 Journal Article %J Zootaxa %D 2021 %T New taxonomic and phylogeographic data on three nominal species of the genus Septaria Férussac, 1807 (Gastropoda: Cycloneritida: Neritidae) %A Ahmed Abdou %K Indo-Pacific %K mitochondrial DNA %K mollusc %K Phylogeny %K shell morphometrics %K taxonomy %X Due to superficial morphological similarities, there is often confusion in the identification of some species of the genus Septaria. A combined analysis of the genital anatomy, morphometric and DNA, based on a portion of the COI gene, applied to three nominal species of this genus, confirmed the validity of Septaria tahitiana Eichhorst, 2016, and suggested that Septaria borbonica (Bory de Saint Vincent, 1804) is a subspecies of Septaria porcellana (Linnaeus, 1758), both taxa with disjunct distribution areas: Septaria borbonica in the western Indian Ocean and Septaria porcellana the western Pacific and eastern Indian Oceans. The possible presence of Septaria tesselata (Lamarck, 1816) in Mayotte (Comoros Archipelago) needs to be confirmed. %B Zootaxa %V 4915 %P 28 - 40 %8 Jan-20-2021 %G eng %U https://www.biotaxa.org/Zootaxa/issue/view/zootaxa.4915.1 %N 1 %! Zootaxa %R 10.11646/zootaxa.4915.110.11646/zootaxa.4915.1.2 %0 Journal Article %J Molecular Phylogenetics and Evolution %D 2019 %T The complex study of complexes: The first well-supported phylogeny of two species complexes within genus Caridina (Decapoda: Caridea: Atyidae) sheds light on evolution, biogeography, and habitat %A de Mazancourt, Valentin %A Klotz, Werner %A Marquet, Gérard %A Mos, B %A Rogers, C %A Philippe Keith %K amphidromy %K freshwater shrimp %K Indo-Pacific %K Mitochondrial genome %K Molecular systematics %K taxonomy %X

Atyid shrimps, a key component of tropical freshwater ecosystems, face multiple anthropogenic threats and thus

need special attention. With more than 300 described species, the genus Caridina is the most speciose of all the

Caridea infra-order. Caridina spp. occupy diverse habitats in tropical freshwaters of the Indo-West Pacific region.

Several species complexes have been recognized, based on common morphological features, but little is known

about how well these morphological characteristics align with phylogenetic characteristics. Furthermore, no

phylogeny of the genus Caridina published so far has provided well-resolved and supported relationships among

different species, thus impeding the possibility of proposing evolutionary hypotheses. In this study we used next

generation sequencing (NGS) to provide new insights into the phylogenetic relationships among the genus

Caridina, focusing on two complexes: ‘Caridina nilotica’ and ‘Caridina weberi’. We collected 92 specimens belonging

to these two groups from most of their known geographical range, representing 50 species, for which we

sequenced seven mitochondrial genes and two nuclear markers using ion torrent NGS. We performed a phylogenetic

analysis, which yielded the first well-supported tree for the genus Caridina. On this tree were mapped the

geographic ranges and the habitats used by the different species, and a time calibration was tested. We found the

driving factors that most likely account for separation of clades are differences in habitat and to a lesser extent

geography. This work provides new insights into the taxonomy of this group and identifies opportunities for

further studies in order to fill knowledge gaps that currently impede the management and conservation of atyid

species.

1. Introduction

%B Molecular Phylogenetics and Evolution %V 131 %P 164-180 %G eng %0 Journal Article %J Invertebrate Systematics %D 2017 %T 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 and Kalfatak as its junior synonym %A de Mazancourt, Valentin %A Marquet, Gérard %A Klotz, Werner %A Philippe Keith %A Castelin, Magalie %K 16S. %K freshwater shrimp %K Indo-Pacific %K Integrative taxonomy %X

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.

%B Invertebrate Systematics %V 31 %P 220-230 %8 01/2017 %G eng