scholarly journals A new genus and species of spionid polychaete (Annelida, Spionidae) from a deep-water cold seep site in the Eastern Mediterranean Sea off Turkey

Zoosymposia ◽  
2020 ◽  
Vol 19 (1) ◽  
pp. 121-134
Author(s):  
JAMES A. BLAKE ◽  
PATRICIA A. RAMEY-BALCI
Keyword(s):  
New Species ◽  
Mediterranean Sea ◽  
Deep Water ◽  
Deep Sea ◽  
New Genus ◽  
Microbial Mats ◽  
Eastern Mediterranean ◽  
Cold Seep ◽  
New Genus And Species ◽  
Eastern Mediterranean Sea

A new spionid polychaete was discovered in deep-sea sediments in the eastern Mediterranean Sea during an expedition by the Ocean Exploration Trust. Specimens were collected by the E/V Nautilus in August 2012 off Turkey, at a depth of 2216 m on the Anaximander Seamount at the Amsterdam mud volcano site. Cores were taken from sediments covered with microbial mats. The new species belongs to the Pygospiopsis-Atherospio Group, which has unusual neuropodial hooks, modified neurosetae in some anterior setigers, and branchiae in middle body segments that are broad, flattened, and fused to the dorsal lamellae. The new species is assigned to a new genus and species, Aciculaspio anaximanderi n. gen., n. sp., and is unusual in having a reduced setiger 1 lacking notosetae; well-developed pre- and postsetal lamellae that encompass the neurosetae and notosetae; notopodial lamellae free from the branchiae in anterior setigers that become fused and flattened in middle and posterior segments; unidentate hooded hooks in both noto- and neuropodia; neuropodial spines in setigers 4–10; and a pygidium with three anal cirri. Aciculaspio anaximanderi n. gen., n. sp. is the first species in the Atherospio-Pygospiopsis Group collected from a deep-water cold seep habitat.

Methane fluxes and carbonate deposits at a cold seep area of the Central Nile Deep Sea Fan, Eastern Mediterranean Sea

2014 ◽  
Vol 347 ◽  
pp. 27-42 ◽  
Author(s):  
Miriam Römer ◽  
Heiko Sahling ◽  
Thomas Pape ◽  
Christian dos Santos Ferreira ◽  
Frank Wenzhöfer ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Deep Sea ◽  
Eastern Mediterranean ◽  
Cold Seep ◽  
Eastern Mediterranean Sea ◽  
Methane Fluxes ◽  
Sea Fan ◽  
Carbonate Deposits

scholarly journals Influence of chemosynthetic ecosystems on nematode community structure and biomass in the deep eastern Mediterranean Sea

2012 ◽  
Vol 9 (12) ◽  
pp. 18131-18173
Author(s):  
N. Lampadariou ◽  
V. Kalogeropoulou ◽  
K. Sevastou ◽  
K. Keklikoglou ◽  
J. Sarrazin
Keyword(s):  
Species Richness ◽  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Nematode Community ◽  
Cold Seep ◽  
Mud Volcanoes ◽  
Mussel Bed ◽  
Remotely Operated Vehicle ◽  
Eastern Mediterranean Sea ◽  
Density And Biomass

Abstract. Mud volcanoes are a special type of cold seeps where life is based on chemoautotrophic processes. They are considered as extreme environments and are characterised by unique megafaunal and macrofaunal communities. However, very few studies on mud volcanoes taking into account the smaller meiobenthic communities have been carried out. Two mud volcanoes were explored during the MEDECO cruise (2007) with the Remotely Operated Vehicle (ROV) Victor-6000; Amsterdam, located south of Turkey between 1700 and 2000 m depth (Anaximander mud field) and Napoli, south of Crete, located along the Mediterranean Ridge at about 2000 m depth (Olimpi mud field). The major aim of this study was to describe distributional patterns of meiofaunal communities and nematode assemblages from different seep microhabitats. Meiofaunal taxa and nematode assemblages at both mud volcanoes differed significantly from other Mediterranean sites in terms of standing stocks, dominance and species diversity. Density and biomass values were significantly higher at the seep sites, particularly at Amsterdam. Nematodes, the dominant meiofaunal taxon, displayed deeper penetration vertically into the sediment at the seep areas, indicating that biological rather than physicochemical factors are responsible for their vertical distribution. Patterns of nematode diversity varied, displaying both very high or very low species richness and dominance, depending on the habitat studied. The Lamellibrachia periphery and mussel bed of Napoli exhibited the highest species richness while the reduced sediments of Amsterdam yielded a species-poor nematode community, dominated by two successful species; one belonging to the genus Aponema and the other to the genus Sabatieria. Analysis of β-diversity showed that habitat heterogeneity of mud volcanoes contributed substantially to the total nematode species richness in the eastern Mediterranean Sea. These observations indicate a strong influence of mud volcanoes and cold-seep ecosystems on the meiofaunal communities and nematode assemblages.

New species of dinoflagellate cysts and other palynomorphs from the latest Miocene and Pliocene of DSDP Hole 603C, western north Atlantic

2003 ◽  
Vol 77 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Martin J. Head ◽  
Geoffrey Norris
Keyword(s):  
New Species ◽  
North Atlantic ◽  
Deep Sea ◽  
New Genus ◽  
Dinoflagellate Cysts ◽  
New Genus And Species ◽  
Early Pliocene ◽  
Dinoflagellate Cyst ◽  
Lower Pleistocene ◽  
Drilling Project

Detailed investigation of the essentially complete uppermost Miocene through Lower Pleistocene sequence in Deep Sea Drilling Project (DSDP) Hole 603C, western North Atlantic, has revealed the presence of the new dinoflagellate cyst speciesLejeunecysta hatterasensis, Lejeunecysta interrupta, Corrudinium devernaliae, andPyxidinopsis vesiculata, as well as the acritarchsLeiosphaeridia rockhallensisHead new species andLeffingwellia costatanew genus and species. Independent magnetobiostratigraphic control of DSDP Hole 603C constrains the ranges of these new species.Lejeunecysta interruptan. sp. appears to range no higher than lowermost Pliocene at 5.2 Ma,Pyxidinopsis vesiculatan. sp. has a range top at about 4.5 Ma in the Lower Pliocene,Corrudinium devernaliaen. sp. has a well-defined range of 4.7–4.1 Ma within the Lower Pliocene, andLeiosphaeridia rockhallensisn. sp. has a similarly well-defined range of 4.4–3.9 Ma within the Lower Pliocene. The presence ofLeiosphaeridia rockhallensisn. sp. in the Ramsholt Member of the Coralline Crag Formation, eastern England, supports an Early Pliocene age for this member.

Spirodesma magdae nov. gen. nov. sp. (Nematoda: Desmodoridae) from the Brazilian deep sea (Campos Basin, Rio de Janeiro, Brazil)

Zootaxa ◽  
2009 ◽  
Vol 2096 (1) ◽  
pp. 109-118 ◽  
Author(s):  
MARIANA DA FONSECA CAVALCANTI ◽  
MARIA CRISTINA DA SILVA ◽  
VERÔNICA DA FONSÊCA-GENEVOIS
Keyword(s):  
New Species ◽  
Deep Sea ◽  
Rio De Janeiro ◽  
New Genus ◽  
Buccal Cavity ◽  
Morphological Features ◽  
New Genus And Species ◽  
Unique Form ◽  
Campos Basin ◽  
Deep Sea Sediments

A new genus and species of Desmodoridae was found in deep-sea sediments of the Campos Basin. Although the cuticle annulation of the new species is similar to members of Desmodorinae, many morphological features are strong enough to classify it within the Spiriniinae. Spirodesma magdae nov. gen. nov. sp. is characterized mainly by the presence of a unique form of unispired amphids, with circular amphideal fovea, and a buccal cavity with three equal teeth, one dorsal and two ventrosublateral.

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