@article {9577, title = {Amphidromous shrimps (Decapoda: Caridea): current knowledge and future research}, journal = {Journal of Crustacean Biology}, volume = {44}, year = {2024}, month = {Feb-09-2024}, type = {Review article}, issn = {0278-0372}, doi = {10.1093/jcbiol/ruae003}, url = {https://academic.oup.com/jcb/article-abstract/44/1/ruae003/7604398?redirectedFrom=fulltext\&login=false}, author = {de Mazancourt, Valentin and Ravaux, Juliette} } @article {9646, title = {An integrative taxonomic revision of the freshwater atyid shrimps (Crustacea: Decapoda: Caridea) of Micronesia}, journal = {Diversity}, volume = {16}, year = {2024}, month = {03/2024}, pages = {1-31}, abstract = {Twelve species of atyid shrimps are reported from three Micronesian islands (Babeldaob, Pohnpei, and Guam) and studied using a combined morphological and molecular approach. Among them, three are new records for the area (Caridina appendiculata, Caridina lobocensis, and Caridina rubella), while three new species are here described: Atyoida chacei sp. nov., Caridina ponapensis sp. nov., and Caridina rintelenorum sp. nov. Descriptions for these new species, diagnoses for poorly known species, and taxonomic notes are provided herein and their biogeography is discussed.}, keywords = {16S, amphidromy, Atyidae, DNA, island, morphology}, doi = {10.3390/d16040200}, url = {https://www.mdpi.com/1424-2818/16/4/200}, author = {de Mazancourt, Valentin and Marquet, G{\'e}rard and Keith, Philippe} } @article {9308, title = {Benchmarking global biodiversity of decapod crustaceans (Crustacea: Decapoda)}, journal = {Journal of Crustacean Biology}, volume = {43}, year = {2023}, month = {Aug-01-2023}, issn = {0278-0372}, doi = {10.1093/jcbiol/ruad042}, url = {https://academic.oup.com/jcb/article/doi/10.1093/jcbiol/ruad042/7234762}, author = {De Grave, Sammy and Decock, Wim and Dekeyzer, Stefanie and Davie, Peter J F and Fransen, Charles H J M and Boyko, Christopher B and Poore, Gary C B and Macpherson, Enrique and Ahyong, Shane T and Crandall, Keith A and de Mazancourt, Valentin and Osawa, Masayuki and Chan, Tin-Yam and Ng, Peter K L and Lemaitre, Rafael and van der Meij, Sancia E T and Santos, Sandro} } @article {9246, title = {Molecular ecology of the freshwater shrimp Caridina natalensis and comparative analysis with other amphidromous species (Decapoda, Teleostei, and Gastropoda)}, journal = {Hydrobiologia}, year = {2023}, month = {Jun-26-2023}, abstract = {Due to their life cycle shared between rivers and oceans, amphidromous organisms serve as intriguing models for studying biogeography. To investigate the implications of their unique life history, we examined the population structure of the amphidromous shrimp Caridina natalensis across its known range in the South Western Indian Ocean. A total of 118 specimens were collected from 7 islands (Mayotte, Moh{\'e}li, Mah{\'e}, Praslin, Silhouette, Mauritius and Madagascar) and the African mainland (South Africa), and their 16S rRNA and Cox1 mitochondrial genes were sequenced. Our findings reveal significant regional structure among archipelagos, suggesting complex patterns of dispersal involving successive events of extinction-recolonization. By conducting a comparative analysis with six other amphidromous species from the South Western Indian Ocean, based on literature sources, we were able to draw conclusions regarding the amphidromous biogeography of the area. Furthermore, we propose a novel classification of amphidromous species, considering their population structure and life history traits. We defined four categories of increasing dispersal abilities and decreasing genetic population structure: 1. Land-locked species; 2. Species with reduced or facultative amphidromy; 3. Species with common amphidromy; and 4. Super-amphidromous species. Lastly, we identified the Comoros Islands (namely Mayotte and Moh{\'e}li) as a critical area for the dispersal of amphidromous species, emphasizing the need for prioritizing conservation efforts in this region.}, issn = {0018-8158}, doi = {10.1007/s10750-023-05283-7}, url = {https://link.springer.com/10.1007/s10750-023-05283-7}, author = {de Mazancourt, Valentin and Ahmed Abdou and Castelin, Magalie and Ellien, C{\'e}line and Clara Lord and Marion Mennesson and Renneville, Cl{\'e}mentine and Marquet, G{\'e}rard and Philippe Keith} } @article {9407, title = {Updated Checklist of the Freshwater Shrimps (Decapoda: Caridea: Atyidae) of Mindoro Island, the Philippines, with a Description of a New Species of Caridina}, journal = {Arthropoda}, volume = {1}, year = {2023}, month = {Jan-12-2023}, pages = {374 - 397}, doi = {10.3390/arthropoda1040015}, url = {https://www.mdpi.com/2813-3323/1/4/15}, author = {de Mazancourt, Valentin and Freitag, Hendrik and von Rintelen, Kristina and Manuel-Santos, Marivene and von Rintelen, Thomas} } @article {8951, title = {Exceptional preservation of internal organs in a new fossil species of freshwater shrimp (Caridea: Palaemonoidea) from the Eocene of Messel (Germany)}, journal = {Scientific Reports}, volume = {12}, year = {2022}, month = {Oct-27-2022}, pages = {1-12}, abstract = {A new species of extinct freshwater shrimp was discovered in the Eocene deposit of the Messel Pit Konservat-Lagerst{\"a}tte. This rare find is represented by only a few specimens, one of which showing exceptionally preserved soft tissues and other internal parts like the stomach with possibly gastric ossicles in place, branchiae, the ovary, and the left mandible, never described in a fossil shrimp. The new species Bechleja brevirostris n. sp. is characterized by a short rostrum bearing 6{\textendash}8 dorsal spines and one ventral tooth, and long second pereiopods with strong chelae. One additional specimen shows a slightly different morphology and might belong to a different species. The systematic position of the species among the superfamily Palaemonoidea is discussed, as well as implications for the knowledge of the paleoenvironment of Lake Messel and the paleobiogeography of the Eocene.}, isbn = {0123456789}, issn = {2045-2322}, doi = {10.1038/s41598-022-23125-9}, url = {https://www.nature.com/articles/s41598-022-23125-9}, author = {de Mazancourt, Valentin and Wappler, Torsten and Wedmann, Sonja} } @article {8954, title = {West Side Story: A molecular and morphological study of Caridina longicarpus Roux, 1926 (Decapoda, Caridea, Atyidae) from New Caledonia reveals a new species}, journal = {Zoosystema}, volume = {44}, year = {2022}, pages = {463-474}, abstract = {Numerous specimens of freshwater shrimps identified as Caridina longicarpus Roux, 1926 were recently collected from New Caledonia. Following an integrative taxonomy approach, they were morphologi- cally and genetically studied. Results of a 16S mtDNA analysis showed that the specimens initially identified as C. longicarpus were distributed in two geographically structured clades. Morphological study showed that the shrimps found in rivers draining to the east coast of the island belonged to C. longicarpus sensu stricto, whereas those from rivers draining to the west coast belonged to a new species, here described as Caridina occidentalis n. sp. Detailed redescription of C. longicarpus is pro- vided and a lectotype is designated. The existence of both species in allopatry could be explained by local biogeographical factors such as the topography of the island or oceanic circulation impacting the dispersal of larvae during the planktonic stage.}, isbn = {0000753777}, doi = {10.5252/zoosystema2022v44a18}, url = {https://bioone.org/journals/zoosystema/volume-44/issue-18/zoosystema2022v44a18/West-Side-Story--A-molecular-and-morphological-study-of/10.5252/zoosystema2022v44a18.full}, author = {de Mazancourt, Valentin and Br{\'e}thiot, Julien and Marquet, G{\'e}rard and Keith, Philippe} } @article {8952, title = {First Occurrence of the Genus Australatya (Crustacea: Decapoda: Atyidae) in Melanesia and Polynesia with Description of a New Species}, journal = {Pacific Science}, volume = {74}, year = {2020}, pages = {297-308}, abstract = {During specific inventories led by the Mus{\'e}um national d{\textquoteright}Histoire naturelle (MNHN, Paris), numerous specimens of Atyidae, particulary of Atya-like shrimps were collected in Melanesia (Vanuatu, Solomon Islands) and in Polynesia (Futuna, Samoa). These specimens were morphologically and genetically examined. Our study revealed that some specimens belonged to a new species in the genus AustralatyaChace, 1983. The aim of this paper is to describe this new species, Australatya keithi sp. nov., and discuss the distribution of its genus in the studied area.}, doi = {10.2984/74.3.7}, url = {https://bioone.org/journals/pacific-science/volume-74/issue-3/74.3.7/First-Occurrence-of-the-Genus-Australatya-Crustacea--Decapoda/10.2984/74.3.7.full}, author = {Lorang, Camille and Marquet, G{\'e}rard and de Mazancourt, Valentin} } @article {9314, title = {A new freshwater crab of the family Hymenosomatidae MacLeay, 1838 (Crustacea, Decapoda, Brachyura) and an updated review of the hymenosomatid fauna of New Caledonia}, journal = {European Journal of Taxonomy}, volume = {671}, year = {2020}, month = {Jun-22-2020}, pages = {1-29}, abstract = {A new genus and species,\ Richerius marqueti\ gen. et sp. nov., of a crab of the family Hymenosomatidae MacLeay, 1838 are described from the inland waters of New Caledonia based on several specimens collected in two streams at altitudes of 180 m and 500 m, respectively.\ Richerius marqueti\ gen. et sp. nov. was compared to the other freshwater species known in New Caledonia,\ Odiomaris pilosus\ (A. Milne-Edwards, 1873), and to species of\ Amarinus\ Lucas, 1980, a genus comprising many freshwater species in New Zealand, Australia, Indonesia, the Philippines, and Papua New Guinea, but never recorded in New Caledonia. The barcode fragment of the COI mitochondrial gene was sequenced for seven specimens of\ R. marqueti\ gen. et sp. nov., and all sequences were deposited in GenBank. A brief and updated review of the New Caledonian marine and freshwater hymenosmatid fauna is provided.}, keywords = {COI, New Caledonia, new genus, New species, Richerius marqueti}, doi = {10.5852/ejt.2020.671}, url = {https://europeanjournaloftaxonomy.eu/index.php/ejt/article/view/997}, author = {Guinot, Dani{\`e}le and de Mazancourt, Valentin} } @article {8130, title = {Solomon{\textquoteright}s Gold Mine: Description or redescription of 24 species of Caridina (Crustacea: Decapoda: Atyidae) freshwater shrimps from the Solomon Islands, including 11 new species.}, journal = {European Journal of Taxonomy}, year = {2020}, month = {Apr-08-2020}, doi = {10.5852/ejt.2020.696}, url = {https://europeanjournaloftaxonomy.eu/index.php/ejt/article/view/1051}, author = {de Mazancourt, Valentin and Boseto, David and Marquet, G{\'e}rard and Philippe Keith} } @article {7045, title = {Taxonomic study of the freshwater shrimps genus Atyoida Randall, 1840 (Crustacea: Decapoda: Atyidae) in Polynesia with a revalidation of A. tahitensis Stimpson, 1860}, journal = {Zootaxa}, volume = {4751}, year = {2020}, month = {Apr-03-2021}, pages = {55 - 74}, abstract = {Numerous specimens of Atyoida were collected in Polynesia during specific samplings led by the Mus{\'e}um national d{\textquoteright}Histoire naturelle (MNHN, Paris) from 1983 to 2017. In the context of an integrative taxonomy, all the Polynesian specimens were morphologically and genetically studied. The molecular study proved that the specimens were split in two different clades separated by 7\% genetic distance (16S) and geographically structured that can be considered as two distinct species. In this article, A. tahitensis Stimpson, 1860 from Eastern Polynesia is re-validated as a distinct species from A. pilipes (Newport 1847) from Vanuatu to Marquesas archipelago. The morphological study, besides coloration patterns (Body blackish on its back, ornamented on its flanks with numerous bluish dots and longitudinal stripes for A. tahitensis; orange-yellow back as well as the antennular peduncle, telson and uropods with the flanks whitish ornamented with numerous blue-black patterns of various shapes for A. pilipes), did not allow us to find characters to distinguish easily the two species. Detailed re-descriptions and the geographical distribution of these two species are given and a neotype deposited in the MNHN (Paris) is designated for A. tahitensis.}, keywords = {Atyidae, Atyoida, Crustacea, Taxonomic}, issn = {1175-5326}, doi = {10.11646/zootaxa.4751.110.11646/zootaxa.4751.1.3}, url = {https://www.biotaxa.org/Zootaxa/issue/view/zootaxa.4751.1}, author = {Camille Lorang and de Mazancourt, Valentin and Marquet, G{\'e}rard and Philippe Keith} } @article {9315, title = {Caridina malanda, a new species of freshwater shrimp (Crustacea: Decapoda: Atyidae) from the Wet Tropics World Heritage area, north{\textendash}eastern Queensland, Australia}, journal = {Zootaxa}, volume = {4652}, year = {2019}, month = {Jul-08-2019}, abstract = {Integrated molecular and morphological studies of newly collected and curated specimens of the genus\ Caridina\ from the Atherton Tablelands, Wet Tropics World Heritage Area in north{\textendash}eastern Queensland, Australia indicated the presence of an undescribed species belonging to the\ Caridina zebra\ Short 1993 complex. This species is somewhat intermediate, although distinct on the basis of molecular data and morphology, from two known sympatric species,\ Caridina zebra\ and\ C. confusa\ Choy \& Marshall 1997, and an allopatric species,\ C. spinula\ Choy \& Marshall 1997, from the Cape York Peninsula, about 500 km north. It is described here as a new species,\ C. malanda\ sp. nov., and compared with similar congeners. A key for the identification of the species, as well as notes on its distribution, ecology, and conservation, are provided.}, issn = {1175-5326}, doi = {10.11646/zootaxa.4652.110.11646/zootaxa.4652.1.5}, url = {https://www.mapress.com/zt/issue/view/zootaxa.4652.1}, author = {CHOY, SATISH and PAGE, TIMOTHY J. and de Mazancourt, Valentin and MOS, BENJAMIN} } @article {5930, title = {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}, journal = {Molecular Phylogenetics and Evolution}, volume = {131}, year = {2019}, pages = {164-180}, abstract = {

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: {\textquoteleft}Caridina nilotica{\textquoteright} and {\textquoteleft}Caridina weberi{\textquoteright}. 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

}, keywords = {amphidromy, freshwater shrimp, Indo-Pacific, Mitochondrial genome, Molecular systematics, taxonomy}, author = {de Mazancourt, Valentin and Klotz, Werner and Marquet, G{\'e}rard and Mos, B and Rogers, C and Philippe Keith} } @article {5929, title = {Resurrection of Caridina natalensis De Man, 1908 (Crustacea: Decapoda: Atyidae) in the South Western Indian Ocean}, journal = {Zootaxa}, volume = {4543}, year = {2019}, pages = {375-387}, abstract = {

Numerous specimens of a freshwater shrimp with small eggs belonging to the Caridina nilotica complex collected in the South Western Indian Ocean were studied and compared with recent and old collection specimens genetically (16S mito-chondrial analysis for recent and type specimens) and morphologically. The results revealed that, in the Indian Ocean, what has been identified by several authors under various species names of the complex C. nilotica, was in fact C. natal-ensis De Man, 1908. This valid species is re-described and compared with closely related species, often confused with it in this area: C. brachydactyla De Man, 1908, C. brevidactyla Roux, 1920, C. gracilipes De Man, 1892 and C. longirostris H. Milne Edwards, 1837.

}, keywords = {16S, Caridina, Comoros, Integrative taxonomy, Madagascar, Mayotte, morphology, Seychelles, South Africa}, author = {de Mazancourt, Valentin and Mlambo, MC and Castelin, Magalie and Renneville, C and Marquet, G{\'e}rard and Philippe Keith} } @article {6040, title = {Revision of freshwater shrimps belonging to Caridina weberi complex (Crustacea: Decapoda: Atyidae) from Polynesia with discussion on their biogeography}, journal = {Journal of Natural History}, volume = {53}, year = {2019}, pages = {815{\textendash}847}, abstract = {

Caridina weberi, an emblematic species of the {\textquoteleft}C. weberi complex{\textquoteright}, was described by De Man in 1892 from different localities in Indonesia. Until now, this species was thought to have a wide distribution in Polynesia. Numerous specimens identified as C. weberi were collected recently from various Polynesian islands. In the context of integrative taxonomy, they were morphologically and genetically studied. Three new species allied to C. weberi are here described: C. marquesensis n. sp., C. futunensis n. sp. and C. tupaia n. sp. The occurrence of C. rapaensis, another species part of the {\textquoteleft}C. weberi{\textquoteright} complex is confirmed. Descriptions or redescription of these species are given as well as their geographical and ecological distributions. The position of these species in the complex is clarified. A key is provided to facilitate identification.

}, keywords = {16S, freshwater shrimp, genetic, Integrative taxonomy, morphology}, doi = {https://doi.org/10.1080/00222933.2019.1612959}, author = {de Mazancourt, Valentin and Marquet, G{\'e}rard and Philippe Keith} } @article {5926, title = {Caridina variabilirostris (Crustacea: Decapoda: Atyidae), a new species of freshwater shrimp from Pohnpei (Micronesia)}, journal = {European Journal of Taxonomy}, volume = {453}, year = {2018}, pages = {1-16}, abstract = {

Recently de Mazancourt\ et al.(2017) highligted the {\textquotedblleft}Pinocchio-shrimp effect{\textquotedblright} on a new species of Atyid shrimp from Pohnpei (Micronesia). In combinating morphological data with a genetical analysis, this species is described here with its ecological distribution.\ The status of this new species is clarified and finally, neither\ C. brachydactyla\ De Man 1908nor\ C. mertoniJ. Roux, 1911 occur in Pohnpei.

}, author = {de Mazancourt, Valentin and Marquet, G{\'e}rard and Philippe Keith} } @article {5344, title = {Description of a new species of Caridina (Crustacea: Decapoda: Atyidae) from two Micronesian islands (Guam and Babeldaob)}, journal = {Zootaxa}, volume = {4377}, year = {2018}, pages = {039{\textendash}050}, abstract = {

During field trips to Guam and Babeldaob Islands in Micronesia, freshwater shrimps were sampled and assigned either to Caridina brachydactyla De Man, 1908 or C. mertoni J. Roux, 1911 (Decapoda: Atyidae), following previous inventories. In combining morphological data with a genetical analysis, it appeared that all the specimens belonged to a new species, Caridina variabilis sp. nov., here described with its distribution. The status of this new species is clarified and finally, neither C. brachydactyla, nor C. mertoni occur in these two islands. DNA sequences of 16S were obtained from the syntypes of C. mertoni.

}, author = {de Mazancourt, Valentin and Marquet, G{\'e}rard and Rogers, D Christopher and Philippe Keith} } @article {5928, title = {Integrative taxonomy helps separate four species of freshwater shrimps commonly overlooked as Caridina longirostris (Crustacea: Decapoda: Atyidae) in Indo-West Pacific islands.}, journal = {Invertebrate systematics}, volume = {32}, year = {2018}, pages = {1422{\textendash}1447}, abstract = {

Caridina longirostris H. Milne Edwards, 1837 described from specimens supposedly from La Macta River near Oran, Algeria, is an emblematic species of the {\textquoteleft}C. nilotica complex{\textquoteright}. Until now this species was thought to have a wide distribution in the Indo-Pacific region. Recently, numerous specimens identified as C. longirostris were collected from various Indo-West Pacific localities. In the context of integrative taxonomy, both old and newly collected specimens were morphologically and genetically studied. Four species allied to C. longirostris are here identified: C. appendiculata Jalihal \& Shenoy, 1998, C. brevidactyla Roux, 1920, C. gracilipes De Man, 1892 and C. meridionalis Roux, 1926. Detailed re-descriptions of these four species are given as well as their geographical and ecological distributions. Caridina nilotica var. brevidactyla is revalidated as the species C. brevidactyla, and C. coulaborensis Richard\&Clark, 2014, C. fritzi Richard \& Clark, 2014 and C. solamulieres Richard \& Clark, 2014 are considered junior synonyms of C. meridionalis. The position of these species in the troublesome {\textquoteleft}C. nilotica complex{\textquoteright} is clarified and some species are synonymised. A key is provided to facilitate identification.

}, keywords = {16S rRNA, Indo-Pacific region, morphology}, author = {de Mazancourt, Valentin and Marquet, G{\'e}rard and Klotz, Werner and Philippe Keith} } @article {5019, title = {Genetic and morphological evidence for cryptic species in Macrobrachium australe and resurrection of M. ustulatum (Crustacea, Palaemonidae)}, journal = {European Journal of Taxonomy}, volume = {289}, year = {2017}, month = {03/2017}, pages = {1{\textendash}27}, abstract = {

\ Macrobrachium australe is an amphidromous prawn living in the insular freshwater systems of the Indo-Pacific. Because it possesses few informative morphological characters, that often vary from one habitat to another, M. australe has produced much taxonomic confusion and has historically been described under eight synonyms. Here, 53 specimens collected throughout the Indo-Pacific under the name M. australe were phylogenetically and morphologically examined. Results revealed that what has been called M. australe belongs to at least two distinct species: M. australe, distributed from the Southwest Indian Ocean to the Central Pacific Ocean, and a cryptic species potentially restricted to the Northwest Pacific Ocean, here identified as M. ustulatum, which until now was considered as a junior synonym. Although they are not quite found in the same habitat (lentic-lotic), the presence of these distinct, and reciprocally monophyletic entities in the same rivers on the islands of Palau and Santo strongly favors the hypothesis of two reproductively isolated entities. Six morphological characters, including the proportions of the joints of the male second pereiopod, the shape of the epistome lobe and the armature of the fourth thoracic sternite, are evidenced as diagnostic. A neotype of M. australe is designated and deposited in the Mus{\'e}um national d{\textquoteright}Histoire naturelle in Paris.

}, keywords = {Amphidromous prawn, Indo-West Pacific, morphology, multi-locus phylogeny}, author = {Castelin, Magalie and de Mazancourt, Valentin and Marquet, G{\'e}rard and Zimmermann, Gabrielle and Philippe Keith} } @article {5023, title = {The {\textquotedblleft}Pinocchio-shrimp effect{\textquotedblright}: first evidence of variation in rostrum length with the environment in Caridina H. Milne-Edwards, 1837 (Decapoda: Caridea: Atyidae)}, journal = {Journal of Crustacean Biology}, volume = {37}, year = {2017}, month = {05/2017}, pages = {243-248}, abstract = {

External morphology has always been the first criterion used to separate species of shrimps,

especially in the freshwater genus Caridina H. Milne-Edwards, 1837, but more doubts have been

expressed regarding the relevance of some of the morphological characters. We collected 27

specimens of Caridina from seven different localities during field work conducted on the island

of Pohnpei (Federated States of Micronesia). After genetic verification that they all belonged to

the same species, 19 morphological variables were measured and correlated with the elevation

of the collecting stations using correlation analyses. We provide evidence that the length of the

rostrum showed strong negative correlation with the elevation. This could be explained either

by the physical stress exerted on the rostrum by the stronger water currents in the stations at a

higher elevation, as a defence against predators in the lower stations, or a combination of both

possibilities. The taxonomy of these shrimps is thus challenging and should not rely only on

rostrum length, but on other characters such as the number of teeth on the dorsal margin of

the carapace, which is not correlated with rostrum length and therefore, with the environment.

}, keywords = {correlation analysis, effect of elevation, freshwater shrimps, Micronesia, morphology, taxonomy}, author = {de Mazancourt, Valentin and Marquet, G{\'e}rard and Philippe Keith} } @article {5020, title = {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}, journal = {Invertebrate Systematics}, volume = {31}, year = {2017}, month = {01/2017}, pages = {220-230}, 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.

}, keywords = {16S., freshwater shrimp, Indo-Pacific, Integrative taxonomy}, author = {de Mazancourt, Valentin and Marquet, G{\'e}rard and Klotz, Werner and Philippe Keith and Castelin, Magalie} }