A comparison of the evolution, diversity and composition of the Cainozoic Ostracoda in the deep water North Atlantic and shallow water environments of North America and Europe

Eynon²,

Moguilevsky

1998

J. Micropalaeontol.

Abstract. Sixteen box core samples of Recent sediment collected in three transects across the East Greenland shelf and slope were analysed for Ostracoda. The samples which range in depth from 274 m to 3355 m, yielded a total of 52 species belonging to 25 genera. No less than 26 of the species also occur in the adjacent Scoresby Sund fjord complex. The fauna represents an interesting mixture of high latitude shallow water Arctic species and others known from bathyal and abyssal depths in the North Atlantic, including some pandemic deep sea species. Many species occur in shallower water here than in the North Atlantic due to the colder water. The fauna comprised of three associations (Shelf/Upper Slope; Slope: Lower Slope/Abyss). A marked faunal turnover occurs at the Upper Slope. The study raises questions concerning the constancy and universality of the relationship between certain ostracod species and water masses.

Section: The Ostracoda Previous Studies On Benthonic Ostracoda From Gmentioning

confidence: 99%

The depth distribution of Ostracoda from the Greenland Sea

Eynon²,

Moguilevsky

1998

J. Micropalaeontol.

“…The superfamily Cytheracea comprises more than 30 families of entirely benthic ostracodes, most of which are marine. They are very poorly represented in the Palaeozoic but become dominant in the Mesozoic and the Cainozoic (Coles 1990;Whatley & Stephens 1976;Whatley 1986Whatley , 1988Whatley , 1990aWhatley et al 1993). However, during the Permian (Whatley 1992 and unpublished;Whatley et al 1993) and Triassic, certain cytheraceans invaded and became adapted to freshwater environments and diversified.…”

Section: Incubation In Fossil Cytheraceamentioning

confidence: 99%

Evidence of brooding in Permian non‐marine Ostracoda

Lethiers

Damotte

1996

LET

The discovery of some exceptional non‐marine fossil Ostracoda, showing larval stages within the carapaces of females, demonstrates that incubation was an ontogenetical adaptation which appeared at least as early as the Permian. Thus, it seems, the superfamilies Danvinulacea and Cytheracea diversified in Permian lakes where the Carbonitacea had flourished in the Carboniferous. The Cypridacea accomplished an evolutionary radiation in continental environments after a permanent invasion from the sea in the Middle Jurassic, thanks to the resistance of their eggs to dessication and heezing and the evolution of parthenogenetic reproduction.

“…Given that many species and genera of ostracods occur in the same abyssal and bathyal environments in more than one ocean basin (Whatley & Ayress 1988;Coles et al 1990), they should potentially be of value in correlating oceanic deposits between such basins, provided that they evolved rapidly enough and were also distributed rapidly enough from one basin to another as to appear as though this happened 'synchronously' in the geological record. Benson (1975Benson ( , 1979, Benson & Peypouquet (1983), Whatley (1985), Whatley et al (1983), Whatley & Coles (1987, 1991, and a number of unpublished doctoral theses completed at Aberystwyth (Downing, 1985;Millson, 1988;Ayress, 1988;) have all shown in various ways that elements of the deep-sea Cenozoic ostracod fauna have at times evolved very rapidly.…”

Section: The Biostratigraphicai Potential Of Deep-sea Ostracodamentioning

confidence: 99%

“…Previous studies were by Brady (1880), Brady & Norman (1889), Tressler (1941), Davies (1981) and Van Harten (1990) Porter (1984) and Harpur (1985) studied Quaternary ostracods from the northern part of the area and off the entrance to the Mediterranean respectively. Coles and Whatley (1989) described many new taxa from the North Atlantic.…”

Section: The Application Of Ostracoda To Biostratigraphy In the Deep Seamentioning

confidence: 99%

Ostracoda as biostratigraphical indices in Cenozoic deep-sea sequences

1993

Some of the disadvantages inherent in the use of benthonic deep-sea Ostracoda such as their lack of pelagic larval stages and the extent to which relative paucity in deeper abyssal environments is prejudicial to diversity, are balanced against the advantages of being pandemic in distribution and independent of latitudinal and surface current temperature controls. The application of Ostracoda to the biostratigraphy of the deep water Cenozoic of the North Atlantic is outlined in some detail and it is shown that podocopid Ostracoda can be used to determine the various nannofossil zones.