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| Registros recuperados: 27 | |
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| Macpherson, E; Segonzac, Michel. |
| Twenty-two species of the genus Munidopsis from the Atlantic Ocean are studied. Five new species are described (M. anemia, M. exuta, M. hirtella, M. laurentae and M. truculenta), and diagnoses and illustrations of some relatively rare species (M. acuminata, M. bairdii, M. livida, M. parfaiti and M. thieli) are provided. None of the species discussed here is restricted to a particular habitat, including species collected from hydrothermal vent (M. acutispina, M. exuta) and cold seep areas (M. acutispina, M. geyeri, M. hirtella, M. livida, M. marionis). The new records of some species greatly extend the previously known distribution range of the species (i.e., M. abyssicola, M. aries, M. bairdii, M. geyeri, M. livida, M. parfaiti, M. thieli). Finally, some... |
| Tipo: Text |
Palavras-chave: Hydrothermal vents; New species; Munidopsis; Galatheidae; Anomura; Decapoda; Crustacea. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-1812.pdf |
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| Storh, Sabine; Segonzac, Michel. |
| Prior to this study, two species of ophiuroid had been described from hydrothermal vent sites, and another from methane cold seeps, all from the Atlantic Ocean. Although ophiuroids have occasionally been reported from vents in the Pacific Ocean as well, none has been described before. This study presents two new species, Spinophiura jolliveti gen. et sp. nov., family Ophiuridae, and Ophiolamina eprae gen. et sp. nov., family Ophiacanthidae, which are most likely endemic to reducing environments in the East Pacific. We also include detailed descriptions of the post-metamorphic development of these species. Spinophiura jolliveti is characterized by up to five rather long, semi-erect arm spines and a relatively small oral shield. Its postlarva is unusual in... |
| Tipo: Text |
Palavras-chave: Cold seep; Hydrothermal vent; Taxonomy; Morphology; SEM; Ophiacanthidae; Ophiuridae; Postlarval development; Brittle stars. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-6475.pdf |
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| Ramirez Llodra, Eva; Segonzac, Michel. |
| The caridean shrimp Alvinocaris niuricola has been observed forming high density populations over mussel beds on the giant pockmark cold seep site Regab in the Gulf of Guinea at 3150 m depth. Samples were collected using the ROV Victor 6000, a beam trawl and a TV grab from two sites. The specimens Were sexed and measured for population structure analysis. In one sample the sex ratio was 1:1, but the other sample had a sex ratio significantly biased towards females. The maximum size of females is larger than males. A sub-sample was used for gametogenesis and fecundity analysis. The oogenesis and spermatogenesis of A. muricola is characteristic of caridean shrimps. The oogonia proliferate from the germinal epithelium and develop into previtellogenic oocytes... |
| Tipo: Text |
Palavras-chave: Reproduction biology; Oogenesis; Sex ratio; Population structure; Caridean shrimp. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2317.pdf |
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| Khripounoff, Alexis; Vangriesheim, Annick; Crassous, Philippe; Segonzac, Michel; Colaco, Ana; Desbruyeres, Daniel; Barthelemy, Roxane. |
| In order to provide information about the export and the distribution of hydrothermal particulate material to the surrounding deep ocean, four moorings were deployed in the vicinity of the hydrothermal Rainbow vent field (Mid-Atlantic Ridge, 36 degrees 14'N, 2250 m depth). The first mooring was a sediment trap with a current meter deployed at 2 m from a chimney of the Rainbow vent field and 1.5 m above the bottom (a.b.) for 16 days. It represented the reference for the initial composition of particles produced by the vent. The total mean mass particle flux (6.9 g m(-2) d(-1)) was distinctly higher than the flux measured at the shallower hydrothermal vents on the MAR segment. This particulate flux showed a high temporal variation at the scale of a few days... |
| Tipo: Text |
Palavras-chave: Zooplankton; Biochemistry; Geochemistry; Particle flux; Hydrothermal vent. |
| Ano: 2001 |
URL: https://archimer.ifremer.fr/doc/2001/publication-801.pdf |
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| Burreson, Eugene; Segonzac, Michel. |
| The deep-sea fish leech Bathybdella sawyeri Burreson has recently been collected from two sites on the South East Pacific Rise at approximately 14 degrees and 17 degrees S, 2623 - 2586 m depth. Leeches were obtained from washings of vent mussels Bathymodiolus thermophilus (Mytilidae) and clams Calyptogena magnifica (Vesicomyidae) collected with a grab by a submersible, or were found attached to the cheliped of the crab Cyanagraea praedator (Bythograeidae) collected in baited traps at 14 S. Most individual leeches had morphology typical of B. sawyeri as originally described, with suckers of approximately equal size, but all specimens collected from the crab C. praedator had unusually large oral suckers that were distinctly larger than the caudal sucker.... |
| Tipo: Text |
Palavras-chave: Cyanagraea; Bythograeidae; Bathybdella; Hydrothermal vent; East Pacific Rise; Piscicolidae; Hirudinida. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2049.pdf |
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| Biscoito, M; Almeida, A; Segonzac, Michel. |
| A preliminary description of the biology of the Saldanha hydrothermal field in the Mid-Atlantic Ridge (36 degrees 34'N, 32 degrees 26'W, 2200 m) is given, based on direct observation, video images and samples. Venting occurs mainly in a diffuse way through sediment, but hydrothermal fluid discharges are visible through centimeter-long orifices, scattered on the sediment, over an area of approximately 400 m(2), at depths between 2,200 and 2,220 metres. Emitted fluids are transparent, with a temperature of 7-9 degrees C. An almost complete absence of macro- and megafauna around the venting orifices was found. The only vent invertebrate identified was the gastropod Phymorhynchus sp., with only two juvenile specimens caught. A careful examination of the images... |
| Tipo: Text |
Palavras-chave: New records; Antimora; Acanthonus; Fish; Sponge; Bathyal megafauna; Gastropoda; Fauna assemblage; Mid Atlantic Ridge; Hydrothermal vents. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-3610.pdf |
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| Shields, J; Segonzac, Michel. |
| Several species of crabs from hydrothermal vent sites in the Pacific Ocean Were found to be infested by small, symbiotic nemertean worms. Worms occurred on both male and female crabs, and were located in mucous sheaths adhering to the axillae between the limbs of males and females, the setae of the pleopods of females, and the sterna of infested male and female crabs. Only juvenile and regressed adult worms were observed, primarily because no ovigerous hosts were examined. Similar species of worms mature by eating eggs, then regress or die after host eclosion. Based on the size of the worms from file vent crabs, their habitus with their crustacean hosts, the presence of accessory stylet pouches, and the presence of a single stylet on a large basis... |
| Tipo: Text |
Palavras-chave: Symbiotic egg predator; Red king crab; De fuca ridge; N SP nemertea; Paralithodes camtschatica; Cold seeps; Crustaceans; Host; Infestation; Australia. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-4753.pdf |
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| Khripounoff, Alexis; Vangriesheim, Annick; Crassous, Philippe; Segonzac, Michel; Lafon, V; Waren, A. |
| In order to provide information on the production and the distribution of hydrothermal particulate and biological material produced by deep-sea hydrothermal vents, three moorings with sediment traps and currentmeters were deployed for one year in the Azores Triple Junction region. Two moorings were positioned close to two hydrothermal vent fields at the Mid-Atlantic Ridge (Rainbow, 36 degrees 14'N, 33 degrees 54'W, 2250 in depth and Lucky Strike 37 degrees 17'N, 32 degrees 17'W, 1600 in depth). A third was moored out of the influence of the Rainbow vents representing the reference of the pelagic flux in this area. At the Rainbow field, particulate flux (range 341-634 g m(-2)d(-1)) showed a high temporal variation controlled essentially by the current... |
| Tipo: Text |
Palavras-chave: Bivalve reproduction; Bivalve larvae; Particle composition; Particle flux; Currents; Deep sea hydrothermal vents. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4059.pdf |
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| Pond, David W; Bell, Michael V; Dixon, David R; Fallick, Anthony E; Segonzac, Michel; Sargent, John R. |
| Fatty acid biomarker analysis coupled with gas chromatography-isotope ratio mass spectrometry was used to confirm the presence of methanotrophic and thiotrophic bacterial endosymbionts in the tissues of a hydrothermal vent mussel (Bathymodiolus sp.), collected from the Menez Gwen vent field on the mid-Atlantic ridge, Monounsaturated (n-8) fatty acids, which are diagnostic of methanotrophic bacteria, were detected in all three types of tissues examined (gill, posterior adductor, and mantle), although levels were highest in gill tissues where the bacteria were found, Stable-carbon-isotope compositions (delta-C-13 per mille relative to that of Peedee belemnite) of fatty acids for all three tissues ranged from -24.9 to -34.9%., which encompasses the range... |
| Tipo: Text |
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| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00448/55922/57836.pdf |
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| Nielsen, Jørgen G.; Moller, Peter Rask; Segonzac, Michel. |
| A new genus and species of ophidiid fishes, Ventichthys biospeedoi, is described based on two male specimens caught in the French BIOSPEEDO expedition to the South East Pacific Rise. They were caught by a baited trap at the hydrothermal vent site Oasis ( 17 degrees 25.38' S, 113 degrees 12.29' W) at 2586 m. The new genus differs from all of the 48 known ophidiid genera by its thick skin, posteriorly placed and enlarged kidneys, broad head, and 4 lateral lines. The most similar genera are Benthocometes and Petrotyx having a blunt snout, one basibranchial tooth patch, granular teeth, and no free pectoral fin rays. Remarks on the ecology of the new species are based on analysis of video documents taken in situ by a submarine Nautile. |
| Tipo: Text |
Palavras-chave: South East Pacific Rise hydrothermal vent; Ventichthys biospeedoi n. gen. et sp.; Ophidiidae. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1732.pdf |
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| Corbera, J; Segonzac, Michel; Cunha, M. |
| A new cumacean genus and species, Thalycrocuma sarradini gen. et sp. nov., belonging to the family Nannastacidae is described from several sites of the Lucky Strike hydrothermal vent field (Mid-Atlantic Ridge, 37N, 1700 m depth). The new genus differs from others in the family by males lacking exopods on the pereopods 3 and 4 and having an antenna with a five-articulate peduncle and a short flagellum. This is the first cumacean species that could be considered, at the moment, as endemic from hydrothermal vent areas. Data on the accompanying fauna including other cumacean species (Cyclaspis longicaudata, Bathycuma brevirostre, Procampylaspis sp. and Makrokylindrus sp.) and some ecological remarks are included. A key for the currently known genera of the... |
| Tipo: Text |
Palavras-chave: Systematics; Morphology; Mid Atlantic Ridge; Hydrothermal vents; Deep sea; Cumacea. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4358.pdf |
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| Rocha, Francisco; Gonzalez, Angel; Segonzac, Michel; Guerra, Angel. |
| Introduction : The hydrothermal vent ecosystem is inhabited by poorly known species of deep-sea octopuses (Lutz & Voight, 1994). Vulcanoctopus hydrothermalis Gonzalez & Guerra, 1998, is the only described cephalopod from a hydrothermal vent (Gonzalez et al., 1998). Little is known about this small benthic octopus, up to 35 mm mantle length, with a muscular and semi-translucent body, lack of any type of chromatic elements in the skin and eye with no trace of an iris (Gonzalez et al., 1998). Its morphology was studied by Gonzalez et al. (in press) but there have been no behavioural studies of this species to date. Most observations of octopus behaviour in abyssal environments, mainly Cirroctopoda, have been described from videotape records (Boletzky... |
| Tipo: Text |
Palavras-chave: Vulcanoctopus hydrothermalis; Behaviour; Cephalopod; Hydrothermal vent. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/publication-897.pdf |
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| Biscoito, Manuel; Segonzac, Michel; Almeida, Armando; Desbruyeres, Daniel; Geistdoerfer, Patrick; Turnipseed, Mary; Van Dover, Cindy. |
| Introduction : Since the discovery of animal communities in oceanic hydrothermal vents in 1977 and in deep-sea cold seeps in 1984 (Londsdale, 1977; Paull et al., 1984) fishes have been regularly observed in association with these chemosynthetically-driven communities, but in most cases they are difficult to catch and therefore species identification can only rely on images taken by the diving vehicles. Ichthyological information pertaining to species inhabiting the deep-sea hydrothermal vents and cold seeps is mentioned in over 30 papers and even in the more detailed and updated lists (Geistdoerfer, 1991; 1996; 1999; Sibuet & Olu, 1998; Tunnicliffe, 1991) there are species missing. The situation is even less clear concerning the bathyal species... |
| Tipo: Text |
Palavras-chave: Fishes; Species identification; Hydrothermal vent. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/publication-896.pdf |
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| Gonzalez, A; Guerra, A; Pascual, S; Segonzac, Michel. |
| During biological sampling of hydrothermal vents on the East Pacific Rise, the manned submersible 'Nautile' caught the first female of the endemic cephalopod Vulcanoctopus hydrothermalis. The specimen caught at the vent site Gromit (21 degrees 33 66'S, 114 degrees 17 98'W at 2832 m depth) is described here in detail and an amended diagnosis of the species proposed. The external morphology, measurements and internal structure resemble that Of males of this species. One of the most remarkable characters is the lack of spermathecae and the absence of apical filaments in the oocytes to provide a site for sperm storage. It is suggested that some species of the genera Benthoctopus and Bathypolypus would be the most suitable octopod ancestor of V. hydrothermalis. |
| Tipo: Text |
Palavras-chave: Female description; Vulcanoctopus hydrothermalis; Cephalopods; Hydrothermal vent. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4044.pdf |
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| Baldrighi, Elisa; Vanreusel, A.; Zeppilli, Daniela; Sandulli, R.; Segonzac, Michel. |
| Several individuals belonging to a new species of the genus Chromadorita (Nematoda: Adenophorea) were collected in a cold-seep area in the Gulf of Guinea during two French cruises: BIOZAIRE 2 (2001) and BIOZAIRE 3 (2003-2004) on board the R/V L'Atalante. In this area, rich chemosynthetic benthic communities have been discovered at 3150 m depth in the large pockmark field named Regab. Chromadorita regabi sp. nov. was found among the eggs in ovigerous specimens of the shrimp Alvinocaris muricola. The combination of long size (1500-2200 mu m), nine strong preanal papillae and relatively small dorsal tooth with weak musculature distinguishes this species from all known congeneric ones. An identification key to all known species of Chromadorita is provided. |
| Tipo: Text |
Palavras-chave: Chromadorita regabi; Cold seep; Gulf of Guinea; Alvinocaris muricola. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00454/56599/58271.pdf |
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| Komai, Tomoyuki; Segonzac, Michel. |
| A taxonomic review of the two genera of the family Alvinocarididae (Decapoda: Caridea), Rimicaris Williams and Rona, 1986 and Chorocaris Martin and Hessler 1990, is presented based on study of type materials and/or supplemental material from recent collections. Two species of Rimicaris, R. exoculata Williams and Rona 1986 and R. kairei Watabe and Hashimoto 2002, and three species of Chorocaris, C. chacei Williams and Rona 1986, C. vandoverae Martin and Hessler 1990, and C. paulexa Martin and Shank 2005, are recognized. All species are exclusively associated with deep-water hydrothermal community. Close relationship between the two genera is confirmed by morphological characters, but the monophyly of Chorocaris is not corroborated. An examination of a good... |
| Tipo: Text |
Palavras-chave: Hydrothermal vents; Taxonomy; Chorocaris; Rimicaris; Alvinocarididae; Caridea; Decapoda; Crustacea. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-3926.pdf |
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| Komai, T; Segonzac, Michel. |
| The hydrothermal vent shrimp genus Mirocaris is reviewed. Morphological comparison between the two nominal species in the genus, M. fortunata and M. keldyshi, was made based on the re-examination of the holotype and paratypes of Mirocarisfortunata and the paratypes of M. keldyshi. Samples newly collected from various sites on the Mid-Atlantic Ridge were also examined. The validity of the genus Mirocaris has been confirmed. However, our study has revealed that the supposed morphological characters distinguishing M. fortunata and M. keldyshi do not provide significant taxonomic differences and further comparison failed to detect morphological differences between the two taxa. Thus M. keldyshi is synonymized with M. fortunata, and so there is only one single... |
| Tipo: Text |
Palavras-chave: Hydrothermalism; Mid Atlantic Ridge; Redescription; Synonym; Taxonomy; M. keldyshi; Mirocaris fortunata. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/2003/publication-883.pdf |
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| Registros recuperados: 27 | |
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