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| Spedicato, Adriana; Sánchez, Nuria; Pastor, Lucie; Menot, Lenaick; Zeppilli, Daniela. |
| The risk assessment of seafloor massive sulfide (SMS) mining on meiobenthic organisms, specifically on soft-sediment meiofauna, is impeded by a lack of knowledge on the biology and ecology of these communities. In this study, we investigated sediment samples taken in proximity of active vents at Trans-Atlantic Geotraverse (TAG) and Snake Pit, two hydrothermal vent fields of the Mid-Atlantic Ridge, in order to explore metazoan meiofauna, particularly nematode community, and its relation to organic carbon, total nitrogen, total sulfur, and dissolved oxygen. Organic carbon and nitrogen contents were low at both sites. High concentrations of total sulfur and low oxygen penetration were found at Snake Pit compared to TAG. Snake Pit showed approximately four... |
| Tipo: Text |
Palavras-chave: Meiobenthos; Nematoda; Mid-Atlantic Ridge; Seafloor massive sulfides; Biodiversity. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00629/74061/73507.pdf |
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| Sánchez, Nuria; Pardos, Fernando; Arbizu, Pedro Martínez. |
| Kinorhynch specimens were studied from abyssal sediment samples collected during seven cruises at the Clarion-Clipperton Fracture Zone (Eastern Central Pacific), a vast area that will be mined for polymetallic nodules in a near future. This study is the first in a series focused on kinorhynchs mainly collected at the German zone following requirements of the International Seabed Authority (ISA), who demands identification of fauna associated with nodules previous to the concession of the exploitation license. A total of 18 species were found, of which three new Echinoderidae species are described herein. Cephalorhyncha polunga sp. nov. is easily discriminated from its congeners by the presence of pointed and prominent tergal extensions together with... |
| Tipo: Text |
Palavras-chave: Cephalorhyncha; Cyclorhagida; Echinoderidae; Echinoderes; Meiofauna; Meristoderes; Taxonomy. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00502/61330/64902.pdf |
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| Cepeda, Diego; Pardos, Fernando; Zeppilli, Daniela; Sánchez, Nuria. |
| Cold seep areas are extremely reduced habitats with spatiotemporal variation of hydrocarbon-rich fluid seepage, low oxygen levels, and great habitat heterogeneity. Cold seeps can create circular to ellipsoid shallow depressions on the seafloor called pockmarks. We investigated two selected pockmarks, characterized by different gas emission, and two sites outside these geological structures at the Mozambique Channel to understand whether and how their environmental conditions affect the kinorhynch fauna in terms of density, richness, and community composition. A total of 11 species have been found living in the studied area, of which three are new species: Fissuroderes cthulhu sp. nov., Fujuriphyes dagon sp. nov., and Fujuriphyes hydra sp. nov. Densities... |
| Tipo: Text |
Palavras-chave: Cold seeps; Deep sea; Ecology; Kinorhynchs; Meiofauna; Diversity; Taxonomy. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00648/75992/76894.pdf |
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| Cepeda, Diego; Pardos, Fernando; Sánchez, Nuria. |
| A new species of Dracoderes, D. spyro sp. nov., is described from Hispaniola Island (Caribbean Sea), and represents the first record of this genus in American waters. The new species is distinguished from its congeners by the presence of lateroventral spines on segments 3–4 and 6–9, lateral accessory spines on segment 5, lateroventral tubes on segments 2, 5 and 10, and laterodorsal tubes on segment 8. Additionally, a dichotomous key to the species level for the genus Dracoderes is included. |
| Tipo: Text |
Palavras-chave: Kinorhynchs; Taxonomy; Morphology; Caribbean Sea; Dominican; Republic; Haiti. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00501/61244/64822.pdf |
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| Cepeda, Diego; González-casarrubios, Alberto; Sánchez, Nuria; Pardos, Fernando. |
| Meiofauna sampling in the proximity of Syd-Hällsö Island (Strömstad, Sweden) revealed a new species of Kinorhyncha from the Skagerrak. The species, Setaphyes elenae sp. nov., is distinguished from its congeners by the arrangement of the middorsal cuticular specializations (it has shortened, distally rounded middorsal processes on segments 1 and 9 and middorsal elevations throughout segments 2–8), as well as by the presence of paired laterodorsal setae on segments 3, 5, 7 and 9 and ventromedial setae on segments 3, 5 and 7 in both males and females. The finding of a new species from the northeastern Atlantic Ocean, provides new valuable information for the recently established genus in the Allomalorhagida. |
| Tipo: Text |
Palavras-chave: Meiofauna; Taxonomy; Scalidophora; Biodiversity; Invertebrates.. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00627/73912/73248.pdf |
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| Sánchez, Nuria; Martínez, Alejandro. |
| Caves are natural laboratories to investigate evolutionary processes in the ocean. In contrast to the many described lineages of cave exclusive crustaceans and annelids, very little is known about cave scalidophorans. We here describe two new species of kinorhynchs from a lava tube in the Canary Islands and a cenote in the Yucatan Peninsula. Leiocanthus bretti sp. nov., from Tenerife, is mainly characterized by the lack of middorsal structure specializations on all trunk segment, middorsal line covered by hairs on segments 3-9, unpaired paradorsal setae on segments 2–9, middorsal seta on segment 10, and laterodorsal setae on segments 2–9 and 11. Pycnophyes kukulkan sp. nov. from Yucatan is defined by the strong denticulation in the tergal anterior margin,... |
| Tipo: Text |
Palavras-chave: Leiocanthus; Loricifera; Meiofauna; Marine cave; Priapulida; Pycnophyes. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00501/61245/64823.pdf |
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| Cepeda, Diego; Pardos, Fernando; Sánchez, Nuria. |
| Two new kinorhynch species from Puerto Rico (Greater Antilles) and Barbados (Lesser Antilles) are described herein from Dr R. P. Higgins unexamined Caribbean meiofaunal samples, which have been stored in the Smithsonian Institution collections. The species from Puerto Rico, Cristaphyes cornifrons sp. nov., belongs to the class Allomalorhagida, whereas the species from Barbados, Echinoderes barbadensis sp. nov., belongs to the class Cyclorhagida. Cristaphyes cornifrons sp. nov. is easily distinguished from most of its congeners by the presence of lateral terminal spines and the absence of male, sexually dimorphic, ventromedial tubes on segment 2, as only other two species of the genus lack these features. Of these, C. cornifrons sp. nov. may be easily... |
| Tipo: Text |
Palavras-chave: Kinorhynchs; Biodiversity; Meiofauna; Morphology; Taxonomy. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00501/61249/64829.pdf |
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| Cepeda, Diego; Trigo, Dolores; Pardos, Fernando; Sánchez, Nuria. |
| Ecomorphology studies the relationship between organisms’ morphology and environment features. To better understand whether the shape of the body and the appendages involved in the movement is correlated to sediment composition in meiofaunal organisms, we study the evolved morphological adaptations to environment in selected taxa of the phylum Kinorhyncha: the allomalorhagid families Dracoderidae and Pycnophyidae, and the cyclorhagid genus Echinoderes. The selected taxa include the most diverse groups of Kinorhyncha worldwide, representing the 75.5% of the total phylum diversity. Widened, plump bodies and lateral terminal spines may be adaptive for species living in coarse, more heterogeneous sediments, as they could maintain a more powerful musculature to... |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00648/75990/76891.pdf |
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