A new species of alvinocaridid shrimp is reported, from the Northwest Eifuku hydrothermal vent field at 16191667 m depth on Mariana Arc. comprehensive phylogenetic reconstruction Alvinocarididae based mitochondrial cytochrome c oxidase subunit I (COI) gene including this reveals paraphyly genus Rimicaris Williams & Rona, 1986 with four other generaAlvinocaridinides, Manuscaris, Opaepele, and Shinkaicarisnested within it. We re-examine material these problematic genera, synonymise them under...

Within the deep ocean, hydrothermal vent ecosystems are home to unique set of species' communities, that live nowhere else, and whose food chains have particularity rely on microorganisms activities through a process called chemosynthesis. Many animals living there adopted strategy hosting these in symbiosis or within their body, including many most emblematic groups such as tubeworms, Pompeii worm, yeti "crabs" scaly-foot hairy snails. Among them, shrimps Alvinocarididae family constitute...

Among hydrothermal vent species, Rimicaris exoculata is one of the most emblematic, hosting abundant and diverse ectosymbioses that provide its nutrition. co-occurs in dense aggregates with much less chacei many Mid-Atlantic Ridge fields. This second shrimp also houses ectosymbiotic microorganisms but has a mixotrophic diet. Recent observations have suggested potential misidentifications between these species at their juvenile stages, which could led to misinterpretations early-life ecology....

Among the endemic and specialized fauna from hydrothermal vents, Rimicaris shrimps constitute one of most important emblematic components these ecosystems. On Mid-Atlantic Ridge, 2 species belonging to this genus co-occur: R. exoculata chacei that differ in their morphology, trophic regime abundance. forms large dense aggregations on active vent chimney walls close proximity fluid emissions, whereas is much less conspicuous, living mostly scattered groups or solitary further away fluids....

Rimicaris exoculata is one of the most well-known and emblematic species endemic vent fauna. Like many other from these ecosystems, shrimps host important communities chemosynthetic bacteria living in symbiosis with their inside cephalothorax gut. For symbiotic partners, mode transmission remains to be elucidated starting point relationship not yet defined, but could begin egg. In this study, we explored proliferation microbial on R. broods through embryonic development using a combination...

The symbiotic shrimp Rimicaris exoculata dominates the macrofauna inhabiting active smokers of deep-sea mid Atlantic ridge vent fields. We investigated nature host mechanisms controlling vital and highly specialized ectosymbiotic community confined into its cephalothoracic cavity. R. belongs to Pleocyemata, crustacean brooding eggs, usually producing Type I crustins. Unexpectedly, a novel anti-Gram-positive type II crustin was molecularly identified in exoculata. Re-crustin is mainly...

Rimicaris exoculata shrimps from hydrothermal vent ecosystems are known to host dense epibiotic communities inside their enlarged heads and digestive systems. Conversely, other the family, described as opportunistic feeders have received less attention. We examined nutrition bacterial colonising 'head' chambers systems of three alvinocaridids-Rimicaris variabilis, Nautilocaris saintlaurentae Manuscaris sp.-using a combination electron microscopy, stable isotopes sequencing approaches. Our...

Variations in offspring production according to feeding strategies or food supply have been recognized many animals from various ecosystems. Despite an unusual trophic structure based on non-photosynthetic primary production, these relationships remain largely under-studied chemosynthetic Here, we use

At deep-sea hydrothermal vents, deprived of light, most living communities are fuelled by chemosynthetic microorganisms. These can form symbiotic associations with metazoan hosts, which then called holobionts. Among these, two endemic shrimp the Mid-Atlantic Ridge (MAR), Rimicaris exoculata and chacei colonized dense diversified in their cephalothoracic cavity digestive system. Although both harbor similar communities, they exhibit widely different population densities, distribution patterns...

Chemosynthetic ecosystems off Aotearoa/New Zealand comprise both hydrothermal vents on the Kermadec Arc and methane seeps Hikurangi Margin which host rich communities of specialized fauna including 4 alvinocaridid shrimp species. The systematic positions these New shrimps have not been studied using genetic tools little is known about their habitat use feeding habits. Here, we re-evaluate taxonomy from barcoding characterize connectivity isotopic niches across 8 localities. We describe a new...

At deep-sea hydrothermal vents, deprived of light, most living communities are fueled by chemosynthetic microorganisms. These can form symbiotic associations with metazoan hosts, which then called holobionts. Among these, two endemic co-occurring shrimp the Mid-Atlantic Ridge (MAR), Rimicaris exoculata and chacei colonized dense diversified in their cephalothoracic cavity digestive system. Although both harbor similar communities, they exhibit widely different population densities,...

Hydrothermal vent shrimps in the genus Rimicaris are among most charismatic deep-sea animals of Atlantic and Indian Oceans, often occurring on towering black smokers dense aggregates thousands individuals. Although this dominance is only possible because symbiosis, no study symbiosis Ocean species has been conducted.

Abstract Most animal species have a singular developmental pathway and adult ecology, but plasticity is well-known in some such as honeybees where castes display profoundly different morphology ecology. An intriguing case the Atlantic deep-sea hydrothermal vent shrimp pair Rimicaris hybisae R. chacei that share dominant COI haplotypes could represent very recently diverging lineages or even morphs of same species. symbiont-reliant with hypertrophied head chamber (in Mid-Cayman Spreading...

Abstract Hydrothermal vents can serve as natural laboratories to study speciation processes due their fragmented distribution often with geographic barriers between habitats. Two sympatric species of Rimicaris shrimps occur at on the Izu-Bonin-Mariana volcanic arcs: loihi also found near Hawai’i and R. cambonae present Tonga Arc. These two biogeographically co-occur are genetically highly similar, raising question mechanisms how they maintain distinct species, including possibility...

Abstract Connectivity among isolated habitat patches via planktonic larval dispersal is crucial for maintaining the regional diversity of hydrothermal vents. Despite, increasing sophistication techniques simulating dispersal, limited information on biological and behavioural traits vent-associated species has unknown affects applicability these methods conservation. Here we focus role periodic reproduction vents, as spawning increasingly been observed in a variety taxa. For...

Abstract Rimicaris exoculata shrimps from hydrothermal vent ecosystems are known to host dense epibiotic communities inside their enlarged heads and digestive systems. Conversely, other the family, described as opportunistic feeders have received less attention. We examined nutrition bacterial colonizing “head” chambers systems of three alvinocaridids – variabilis , Nautilocaris saintlaurentae Manuscaris sp. using a combination electron microscopy, stable isotopes sequencing approaches. Our...

Abstract Among the endemic and specialized fauna from hydrothermal vents, Rimicaris shrimp surely constitutes one of most important emblematic components these ecosystems. In Mid Atlantic Ridge, two species affiliated to this genus co-occur: exoculata chacei that differ by their morphology, trophic regime as well abundance. The first forms large dense aggregations on active vent chimney walls in close proximity fluid emissions, whereas second is recognized much less conspicuous, living...

Abstract Most animal species have a singular developmental pathway and adult ecology, but plasticity is well-known in some like honeybees where castes display profoundly different morphology ecology. An intriguing case the Atlantic deep-sea hydrothermal vent shrimp Rimicaris hybisae/chacei that share dominant COI haplotypes develops into either symbiont-reliant hybisae with hypertrophied head chamber (in Mid-Cayman Spreading Centre) or mixotrophic chacei narrow (on Mid-Atlantic Ridge). Here,...