Results 11 to 20 of about 6,708 (227)

The earliest ostracods: the geological evidence

open access: yesSenckenbergiana lethaea, 2008
The oldest assumed ostracods appear in the fossil record from the TremadocianPaltodus deltifer conodont Biozone. Although geographically widespread these early ostracods have no obvious Cambrian antecedents. Their first appearance at ca. 485 Ma contrasts with molecular evidence that suggests a much earlier (latest Proterozoic or Cambrian) origin for ...
Williams, M.   +5 more
openaire   +4 more sources

Ostracods in the Palaeozoic?

open access: yesSenckenbergiana lethaea, 2008
The attribute traditionally used to recognise the occurrence of ostracods in the Palaeozoic stratigraphic record has in essence been the presence of a bivalved arthropod carapace of small size. Discoveries offering unparalleled insight into the soft part palaeobiology of tiny bivalved Palaeozoic arthropods, when taken together with the notion that a ...
Siveter, DJ, David J. Siveter
openaire   +2 more sources

Two new species of Cypricercinae McKenzie, 1971 (Crustacea: Ostracoda) from Thailand

open access: yesEuropean Journal of Taxonomy, 2021
Two new species of the subfamily Cypricercinae McKenzie, 1971 are described from the Western part of Thailand: Pseudostrandesia ratchaburiensis sp. nov. and Strandesia prachuapensis sp. nov. Pseudostrandesia ratchaburiensis sp. nov.
Sukonthip Savatenalinton
doaj   +1 more source

Diet of larval Ambystoma rivulare (Caudata: Ambystomatidae), a threatened salamander from the Volcán Nevado de Toluca, Mexico

open access: yesPhyllomedusa: Journal of Herpetology, 2015
Several species of salamander in the genus Ambystoma occur in the mountains surrounding Mexico City and are considered at risk of extinction. However, little is known about their ecology and natural history. The Toluca Stream Siredon (Ambystoma rivulare)
Julio A. Lemos-Espinal   +3 more
doaj   +3 more sources

Lake-Level Changes and Their Paleo-Climatic Implications at the MIS12 Lower Paleolithic (Middle Pleistocene) Site Marathousa 1, Greece

open access: yesFrontiers in Earth Science, 2021
Lithics and cut-marked mammal bones, excavated from the paleo-lake Marathousa 1 (MAR-1) sediments in the Megalopolis Basin, southern Greece, indicate traces of hominin activity occurring along a paleo-shoreline ca. 444,000 years (444 ka) ago.
Ines J. E. Bludau   +21 more
doaj   +1 more source

Periphytic community structure of Ostracoda (Crustacea) in the river-floodplain system of the Upper Paraná River

open access: yesActa Limnologica Brasiliensia, 2017
Aim: We assessed the effect of environmental factors on the structure of periphytic ostracods communities along the river-floodplain system of the Upper Paraná River.
Janet Higuti   +6 more
doaj   +1 more source

Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda) [PDF]

open access: yes, 2013
Ostracods belonging to the genus Bennelongia differ much in valve morphology between adults and juveniles. Adult valves are asymmetrical, characterised by a beak-like feature in the anteroventral region of the left valve, and, with some notable ...
De Deckker, Patrick   +6 more
core   +1 more source

Global Warming and Mass Extinctions Associated With Large Igneous Province Volcanism

open access: yesGeophysical Monograph Series, Page 83-102., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
David P. G. Bond, Yadong Sun
wiley  

+1 more source

Ostracods and paleoambiental inferences in the Plottier Formation (Coniancian - Upper Cretaceous) of the Barreales Lake, Neuquén [PDF]

open access: yes, 2022
Upper Cretaceous outcrops, at the northeast of Barreales lake, Neuquén, Argentina, has given in the last 20 years a rich vertebrate fauna including dinosaur, reptiles, fish and plants on different sites.
Kihn, Romina Gisela   +1 more
core   +1 more source

A Long-Term Record of Quaternary Facies Patterns and Palaeonvironmental Trends from the Po Plain (NE Italy) as Revealed by Bio-Sedimentary Data

open access: yesGeosciences, 2021
Understanding Quaternary dynamics of delta-coastal plains across multiple glacial-interglacial cycles in the Milankovitch band (~100 kyrs) is crucial to achieve a robust evaluation of possible environmental response to future climate-change scenarios. In
Veronica Rossi   +5 more
doaj   +1 more source

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