Nicolas Rabet

• PhD, HDR
• Professor (Full) at Sorbonne Université, UPMC/MNHN

In this study, we conducted a molecular analysis, based on the comparison of mtDNA sequences of cytochrome oxidase I (COI) of the species Tanymastix stagnalis Linnaeus, 1758 from Algeria, with other available sequences. Phylogenetic analysis clarified the status of this species and its phylogenetic links between European and North African populatio...

This PCR protocol has been used to amplify the Cytochrome Oxydase I gene of neo-caledonian genera Boeckella, Lynceus, Latonopsis, Eulimnadia and Streptocephalus with several primers.

This protocol is derived from the QIAamp DNA micro kit (QIAGEN) protocol and was used to extract DNA from whole or parts of zooplanktonic freshwater crustaceans (Copepoda, Branchiopoda, ...) from New Caledonia.

In this study, a molecular analysis, based on the comparison of mtDNA sequences of cytochrome oxidase I (COI) of the species Tanymastix stagnalis Linnaeus, 1758 from Algeria, with other available sequences, was performed. Phylogenetic analysis clarified the status of this species and its phylogenetic links between European and North African populat...

Thirteen new freshwater populations of the copepod genus BoeckellaDe Guerne & Richard, 1889 were found during three expeditions to New Caledonia (‘La Planète Revisitée,’ 2016-2018). The 12 populations from the Plaine des Lacs, which show remarkable genetic diversity among themselves, were identified as B. spinogibbaDefaye, 1998, the only species of...

Molecular analyses based on the comparison of Chirocephalus species mtDNA cytochrome oxidase I (COI) sequences obtained from Algeria, Morocco and France with other available sequences were performed. The analysis clarified the status of the genus Chirocephalus Prévost, 1803 in Algeria and its phylogenetic links with other populations. Three lineage...

Sacculina carcini is an endoparasite of the green crab, Carcinus maenas. This parasite induces behavioural changes in its host and affects its metabolism by inhibiting moulting and reproduction. Using a proteomic approach in mass spectrometry, we studied the haemolymph proteomes of healthy and parasitized wild green crabs from Brittany, France to i...

The Lower Devonian (Lower Emsian, −400 Myr) roof slates of the Hunsrück in southeastern Germany have delivered a highly diverse and exceptionally preserved marine fauna that provides a unique snapshot into the anatomy and ecology of a wide range of Palaeozoic animals. Several of the described taxa, however, remain enigmatic in their affinity, at le...

We assign the only Australian leptestherid clam shrimp, Eoleptestheria ticinensis (Balsamo-Crivelli, 1859) to a new species status, Leptestheria timmsi sp. nov., based on the latest molecular phylogeny of spinicaudatan clam shrimps from a previous study. We provide a redescription of the species, highlighting morphological details not explored prev...

This study results from a continued investigation of the occurrence and diversity of parasites of freshwater fish in the Solomon Islands. Thus, we revealed a new host as well as a new site of infection and a new geographical area for the cryptogonimid parasite, Stemmatostoma cribbi (Digenea: Cryptogonimidae). The cryptogonimid species was identifie...

Molecular analyses based on the comparison of Chirocephalus species mtDNA cytochrome oxidase I (COI) sequences obtained from Algeria, Morocco and France with other available sequences were performed. The analysis clarified the status of the genus Chirocephalus Prévost, 1803 in Algeria and its phylogenetic links with other populations. Three lineage...

Spinicaudatan clam shrimps are an evolutionarily ancient lineage restricted to temporary freshwater pools. Use of classical morpho-taxonomic approaches alone have led to some issues in the taxonomy of this group, which are now being resolved through integrative taxonomy. Here, we describe two new leptestherid spiny clam shrimps Leptestheria chaluky...

Myxosporeans are microscopic cnidarians associated with severe diseases in aquaculture and wild fish populations. This group of parasitic cnidarians thus warrants close attention concerning its potential impact on susceptible fish stocks. At present, little is known about this group of parasites infecting anguillid eels. From myxospore specimens co...

Laevicaudatan branchiopods, also called 'smooth clam shrimps' or 'pea shrimps', are rare crustaceans found exclusively in temporary, small freshwater bodies, which stay dry most of the year. Only 42 laevicaudatan species have been described so far, 90% of which belong to the genus Lynceus. The first multilocus phylogeny of the group is provided her...

Spinicaudata (spiny clam shrimp) is a taxon of Branchiopoda occurring since the Devonian and today it occurs nearly globally in temporary water bodies. We present the most species-rich phylogenetic analyses of this taxon based on four molecular loci: COI, 16S rRNA, EF1α and 28S rRNA. Our results support previous findings that Cyzicidae sensu lato i...

Leptestheria (Spinicaudata: Leptestheriidae) was collected for the first time from Brazil. This species was found during a study on temporary pools in the municipality of Palmas de Monte Alto in Bahia state, which is in the Caatinga climatic zone. A morphological description of this new species is presented and compared with other known South Ameri...

The large branchiopod crustacean fauna (fairy shrimp, tadpole shrimp and clam shrimp) of the Neotropical Bioregion are incompletely known, with scattered records for many taxa, and many new taxa discovered and described regularly. As an aid to furthering our knowledge of the group in this region, we present an assortment of notes and records on var...

New vertebrate remains are reported from the Late Devonian (?Frasnian) Cuche Formation of northeastern Colombia, including a new taxon of antiarch placoderm (Colombialepis villarroeli, gen. et sp. nov., previously reported as Asterolepis) and a new taxon of arthrodiran placoderm (Colombiaspis rinconensis, gen. et sp. nov.). We also report evidence...

1. Intense anthropogenic disturbance threatens temporary pond ecosystems and their associated fauna across the Palearctic. Since fairy shrimps (Crustacea, Branchiopoda) are endemic to temporary ponds, populations are declining due to habitat loss and it is important to define adequate units for conservation. 2. Phylogeographic reconstructions, base...

We present the complete mitochondrial (mtDNA) genome of the branchiopod Limnadia lenticularis (Linnaeus, 1761). The circular genome is 15,151 bp in size and includes the standard complement of 37 genes (13 protein-coding genes, 22 tRNA genes and two rRNA genes) plus one non-coding region (control region). Genes were encoded on one or the other of b...

A new species of Chirocephalus collected in temporary freshwater ponds in Northeastern Algeria is described. Chiroceph-alus sanhadjaensis sp. nov. seems to be restricted to Ain-Magroun and Belkroun pools (Skikda Province). The most similar species is C. marchesonii Ruffo & Vesentini, 1957, which is endemic to Italy. The new taxon, belonging to the...

We present an overview of the morphological diversity and geographical distribution of the anostracan genus Dendrocephalus Daday, 1908, and describe two new species: D. aranai sp. nov. from Jequitinhonha in the state of Minas Gerais and D. xikrini sp. nov. from the Carajás Mountains (Serra dos Carajás) in the state of Pará. These species have impor...

We describe a new species of Eulimnadia, Eulimnadia bondi sp. nov., from the state of Goa, India. This is the 8th species to be described from the country and first from this state. This species differs from all other Indian species in having unique egg morphology - cylindrical egg with dilated borders at both ends and a specific internal eggshell...

Arthropods are the first animals to colonize land habitats, with myriapods and arachnids having done so at least by the Silurian. Much later several lineages of Pancrustacea (hexapods and the paraphyletic crustaceans) also venture onto land: the hexapods by the Early Devonian, and later at least four other groups of pancrustaceans, namely isopods,...

Arthropods were the first known animals to colonise land habitats, with myriapods and arachnids having done so at least by the Silurian. Much later, several lineages of Pancrustacea (hexapods and the paraphyletic crustaceans) also ventured onto land; the hexapods by the Early Devonian, and later at least four other groups of crustaceans, namely iso...

Cet article relate la découverte de 2 espèces d’anostracés dans une mare temporaire d’un village de la vallée du Drugeon, dans le Haut Doubs. Il s’agit de la première citation de ces rares espèces dans la région. Après quelques généralités sur les crustacés grands branchiopodes, ces deux espèces, ainsi que le milieu dans lequel elles ont été observ...

We provide complete re-descriptions of a few Indian spinicaudatan clam shrimp species studied from the collection of Daday de Deés stored at the Muséum National d'Histoire Naturelle (MNHN), Paris. For Eocyzicus bouvieri Daday, 1913 and Leptestheria sarsi (Daday, 1923), we highlight taxonomical characters, like cercopod and telson not elaborated by...

This original form of this rebuttal was submitted to Science on 3 March 2017 (limited to 300 words as per Science editorial policy) but rejected on 13 March 2017. Herein, we elaborate on our original Science submission in order to more fully address the issue without the length limitations. This rebuttal is followed by the list of the signatories w...

The detection of chemical signals is involved in a variety of crustacean behaviors, such as social interactions, search and evaluation of food and navigation in the environment. At hydrothermal vents, endemic shrimp may use the chemical signature of vent fluids to locate active edifices, however little is known on their sensory perception in these...

Sacculina carcini is member of a highly-specialized group of parasitic cirripeds (Rhizocephala) that use crabs (Carcinus maenas) as hosts to carry out the reproductive phase of their life cycle. We describe the naupliar development of S. carcini Thompson, 1836 from a very precise monitoring of three different broods from three specimens. Nauplii we...

The marine species sensitivity to climate change will depend on the ways by which these species can adapt to thermal increase and heterogeneity. Here, we present evidence that the intertidal shrimp Palaemon elegans acclimates its thermal tolerance, in response to environmental water temperature, through a significant shift of its upper thermal limi...

A new spinicaudatan species, Eulimnadia pampa sp. nov., is described from Argentina mostly based on the differential egg morphology. This species was collected from rainwater pools from Buenos Aires City and the provinces of Buenos Aires and Entre Ríos, and compared to other Neotropical species. Previous Argentine record of E. brasiliensis is shown...

Information concerning the morphology of Dendrocephalus brasiliensis Pesta, 1921 is currently fragmented. This study reviewed the morphological structures described previously and new features (e.g., antenna-like structures and gonopod). We review the distribution of this species and also expand the geographic distribution of D. brasiliensis in the...

The spinicaudatan clam shrimp is a group of branchiopod crustaceans that has existed as far back as the Devonian and well-preserved fossils are known. Evidence of monophyly exists for only one family (Limnadiidae), which has a worldwide distribution and morphological conservatism. The evolutionary relationships among genera and diversification mech...

Branchiopod crustaceans are represented by fairy, tadpole, and clam shrimps (Anostraca, Notostraca, Laevicaudata, Spinicaudata), which typically inhabit temporary freshwater bodies, and water fleas (Cladoceromorpha), which live in all kinds of freshwater and occasionally marine environments [1, 2]. The earliest branchiopods occur in the Cambrian, w...

The genus Afrolimnadia was proposed by Rogers et al. (2012) for the spinicaudatan clam shrimp species Eulimnadia alluaudi Daday, 1926 (Branchiopoda, Diplostraca, Limnadiidae). The name Afrolimnadia, however, was preoccupied for a fossil genus of spinicaudatan clam shrimp (Diplostraca, Lioestheriidae) described by Tasch in a book in 1987 (Tasch, 198...

We revised Eulimnadia from a section of the northern hemisphere that spans from 18°W to 60°E longitude. We investigated both internal and external egg morphology of all available Eulimnadia in this region. Two new populations from Mauritania show a particular egg morphology and are described as new species: E. adrarensis n. sp. and E. rogersi n. sp...

A new notostracan crustacean, Strudops goldenbergi gen. et sp. nov., is described from the well-preserved terrestrial arthropod fauna of the Upper Devonian of Strud, Belgium. The fossil notostracan bears a close resemblance to modern notostracans in possessing a large, simple head shield covering almost half of the whole body, a set of phyllopodous...

An updated inventory of large branchiopods of the Western Maharashtra state, India is presented for the first time. Employing current identification keys, we have detailed the egg morphology of Eulimnadia indocylindrova, which shares some similarities with E. geayi from South America and E. alluaudi from Madagascar, based on these egg characters. A...

Although the fairy shrimp Chirocephalus diaphanus Prévost, 1803 is considered as the most common large branchiopod species in France, its distribution remains poorly known. We present here updated data about its distribution in the Armorican Massif, a geologic unit that covers a large area in the northwest of France. We describe 83 sites, among whi...

Studying the species distribution of Limnadiidae, a family of crustaceans, in environments favourable to their growth and reproduction is made difficult by their extremely short life cycle and the transient existence of adult forms. However, the eggs of these branchiopods are highly resistant to environmental extremes and persist in the soil of hum...

The evolution of reproductive systems has intrigued evolutionary biologists for well over a century. Recent empirical and theoretical work has elucidated the evolution of dioecy (separate males and females) from hermaphroditism in many plant species. The reverse transition, evolving hermaphroditism from dioecy, has occurred many times in animals, a...

Fairy shrimp (Crustacea: Anostraca) are specialist inhabitants of temporary aquatic habitats. In many parts of the world and particularly in Western Europe, however, populations are declining while the development of adequate conservation strategies is impeded by a poor knowledge of the genetic structure and taxonomic status of remaining lineages....

New parthenogenetic and gonochoristic populations of Artemia were found along the French Atlantic and Mediterranean coasts. The taxonomic identity of these new populations was determined based upon: i) an analysis of the variation in the caudal gene, ii) morphology of the penis and frontal knob of male specimens using scanning electronic microscopy...

In this work we describe the external morphology and shell cross section of eggs of three species of Brazilian Eulimnadia: E. geayi, E. colombiensis and E. magdalensis. In these species, cross sections show variation of vesicle size and strut thickness in the alveolar layer and also possible presence of hollows. With these new records, we increase...

The extant genera of the spinicaudatan clam shrimp family Limnadiidae are revised using morphological criteria built on previously published molecular analyses. The combined analyses demonstrate the presence of eight well defined genera, two of which are new to science and one (Paralimnadia) that is resurrected. We present the description of the ne...

In the context of climate change, there is a sustained interest in understanding better the functional mechanisms by which marine ectotherms maintain their physiological scope and define their ability to cope with thermal changes in their environment. Here, we present evidence that the variable shrimp Palaemonetes varians shows genuine acclimation...

The Anostraca is a diversified crustacean group inhabiting essentially in temporary wetlands on all continents. The genus Dendrocephalus sensu stricto is endemic to tropical or subtropical Neotropical fresh water pools. Of the 13 described species, four are reported from Brazil. Species identification is based on morphological differences on the co...

Révision de la morphologie des œufs d'Eulimnadia (Crustacea, Branchiopoda, Spinicaudata). La morphologie des œufs d' Eulimnadia est présentée sur la base d'échantillons conservés au Muséum national d'Histoire naturelle, Paris, représentant 11 espèces dont une indéterminée. L'étude de tous les spécimens révèle la présence de neuf types différents d'...

A first attempt to prospect was done in the Garrigues in the North of Gard allowing to identified 3 species of large branchiopods (Rabet, 1999). In this work, I complete the distribution of these species using several methods: a technique of resting egg detection, complementary prospecting in the field and breeding experiments. A presentation of th...

Genes are regularly transmitted vertically, within one lineage, from one generation to the next, but they can also be exchanged between lineages by horizontal gene transfer (HGT). HGTs are frequent in prokaryotes and have been shown to play important roles in unicellular eukaryotes, whereas only a few instances are known in animals [1,2]. Here, we...

New parthenogenetic and sexual populations of Artemia were found along the French Atlantic and Mediterranean coasts. In order to determine the specific status of these populations, we used referential populations of A. franciscana (from USA) and A. salina (from Algeria, Tunisia and Egypt). We present a genetic study using the variability of the dev...

Cholinesterase activity is known in representatives of all living organisms phyla but the origin of the cholinergic system as known in bilaterian animals is still undeciphered. In particular the implication of cholinesterases in the nervous system of non-bilaterian Metazoa is not well known. We thus chose to investigate this activity in the Clytia...

Nematogenesis, the production of stinging cells (nematocytes) in Cnidaria, can be considered as a model neurogenic process. Most molecular data concern the freshwater polyp Hydra, in which nematocyte production is scattered throughout the body column ectoderm, the mature cells then migrating to the tentacles. We have characterized tentacular nemato...

New parthenogenetic and gonochoristic populations of Artemia were found along the French Atlantic and Mediterranean coasts. The taxonomic identity of these new populations was determined based upon: i) an analysis of the variation in the caudal gene, ii) morphology of the penis and frontal knob of male specimens using scanning electronic microscopy...

The shape of the resting eggs of a large branchiopod crustacean, the Anostraca Tanymastix stagnalis, is represented very accurately by analytical expressions. The occurrence of atypical shape of some T. stagnalis eggs may be viewed as a simple change of the analytical expression describing the usual egg shape. Their unusual shape may be explained b...

Dendrocephalus thieryi nov. sp., discovered in the state of Minas Gerais, Brazil, is described. The new species is defined by a unique morphology of its male frontal appendage and of the endopodites of the first four thoracopods. A dichotomous key to all known Dendrocephalus species based on male morphology is presented.

Dendrocephalus thieryi nov. sp., discovered in the state of Minas Gerais, Brazil, is described. The new species is defined by a unique morphology of its male frontal appendage and of the endopodites of the first four thoracopods. A dichotomous key to all known Dendrocephalus species based on male morphology is presented.

Hox genes play a central role in the specification of distinct segmental identities in the body of arthropods. The specificity of Hox genes depends on their restricted expression domains, their interaction with specific cofactors and selectivity for particular target genes. spalt genes are associated with the function of Hox genes in diverse specie...

Lynceus brachyurus (Branchiopoda, Laevicaudata, Lynceidae) has been found in France for the first time. This species lives in various types of temporary ponds that depend on the ground water level. We provide some ecological, biogeographical, and morphological information about Lynceus brachyurus and indicate the occurrence of remarkable sympatric...

All arthropods share the same basic set of Hox genes, although the expression of these genes differs among divergent groups. In the brine shrimp Artemia franciscana, their expression is limited to the head, thoracic/trunk and genital segments, but is excluded from more posterior parts of the body which consist of six post-genital segments and the t...

The crustaceans cirripedes (barnacles) are characterised by the lack of fully developed abdominal segments at any stage of their life cycle. However, in nauplius larvae of the cirripede Sacculina carcini, we detected five small engrailed stripes in a postero-dorsal region behind the sixth thoracic segment, that we interpreted as a vestigial abdomen...