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demersal taxa

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Journal Article
Journal: PALAIOS
Published: 01 August 2012
PALAIOS (2012) 27 (8): 585-593.
... the stage, however. Successive bulk samples from the Lombardian Alps, Italy, reveal gradual changes in dominant taxa throughout the Norian, and paleoecological transitions consistent with the Mesozoic Marine Revolution (MMR) hypothesis. At the expense of stationary epifauna, mobile infauna diversified...
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Journal Article
Journal: PALAIOS
Published: 01 March 2011
PALAIOS (2011) 26 (3): 160-172.
... by an overall relative rise in sea level. The fish assemblage consists of 31 taxa belonging to 16 families, although only six families represent >95% of the examined material. The largest part of the assemblage consists of benthic and demersal taxa inhabiting sandy and well-oxygenated substrates...
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Journal Article
Journal: PALAIOS
Published: 01 April 2016
PALAIOS (2016) 31 (4): 122-124.
... assemblages are consistent with a scenario in which demersal or epifaunal durophagous predation rendered the sediment-water interface an increasingly dangerous place for taxa that were incapable of escaping or resisting predation attempts. Nevertheless, the evidence of a mid-Norian paleoecological transition...
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Journal Article
Journal: Paleobiology
Published: 01 June 2012
Paleobiology (2012) 38 (3): 424-446.
... exposure, high inflation, and low whorl expansion) plot in the vertical migrant field. Oxycones (low umbilical exposure, low inflation, and high whorl expansion) plot in the nekton field. Platycones and planorbicones plot in the demersal field. Each drawing is a trace of a genus figured in the Treatise...
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Journal Article
Published: 04 May 2010
Geological Magazine (2010) 147 (6): 860-870.
... similarity of tropical and demersal taxa (e.g. Pristidae, Carcharhinidae, Myliobatiformes) is noteworthy and implies a large longitudinal marine faunal exchange along the south coast of the Tethys and towards the Eastern Atlantic at the end of the Eocene. Concerning the selachians, there is no doubt...
Journal Article
Journal: Paleobiology
Published: 01 November 2010
Paleobiology (2010) 36 (4): 534-554.
... representatives of these genera, and selected brackish and marine corbulid genera. A species-level analysis added all described freshwater corbulid taxa to the genus-level matrix. Our results were highly resolved (few most-parsimonious trees), but not particularly robust (low branch support). For the genus-level...
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Journal Article
Journal: PALAIOS
Published: 01 April 2016
PALAIOS (2016) 31 (4): 190-202.
... composition of the same samples. Scale bar in all images=500 microns (approximately). Fig. 6.— Plotted relationships between total identified specimens and taxa per bulk sample. Gray-filled circles=bulk samples 1-2. White-filled circles=bulk samples 3-12. Fig. 7.— Relative abundances of bulk sample fossil...
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Journal Article
Journal: Paleobiology
Published: 27 April 2015
Paleobiology (2015) 41 (3): 387-401.
... G. , Garcia N. , and Crespo E. A. 2011 . Solapamiento trofico entre el lobo marino de un pelo Otaria flavescens y la pesqueria de arrastre demersal del golfo . San...
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Journal Article
Published: 01 September 2013
Journal of Paleontology (2013) 87 (5): 755-774.
... to a purported connection between the Pacific and Atlantic (Caribbean) oceans. However, the diverse chondrichthyan fauna has been poorly documented. Based on recent field discoveries and further analysis of existing collections, the chondrichthyan fauna from this unit comprises at least 26 taxa, of which four...
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Journal Article
Journal: Geology
Published: 01 December 2005
Geology (2005) 33 (12): 929-932.
... and bryozoan cyphonautes (not shown due to uncertainty concerning their phylogenetic position) could have evolved at a significantly younger date. Shown in light blue is generic fossil record (at 1 X; see scale on left) of five different epifaunal suspension feeding taxa: cnidarians, ectoprocts, brachiopods...
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Journal Article
Journal: PALAIOS
Published: 01 January 2013
PALAIOS (2013) 28 (1): 9-22.
... in abundance and diameter of this ammonite appear to be related to changes of oxygen content in the water column. P. flexuosum dwelled in the well-oxygenated upper surface water and formed part of the open marine pelagic ecosystem; a demersal mode of life is excluded here. Dimorphism is expressed in size...
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Journal Article
Journal: PALAIOS
Published: 01 April 2005
PALAIOS (2005) 20 (2): 121-141.
... disparity. Twenty ammonoid genera are recognized and assigned to seven morphostructural groups. The aims of this study are to: (1) interpret abundance variations of ammonoid taxa in terms of taphonomic processes, sedimentary dilution, and paleoenvironmental factors; and (2) discuss the habitat and mode...
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Journal Article
Published: 09 September 2016
Journal of the Geological Society (2016) 174 (1): 18-22.
... and green–brown dolomitic shales ( Fig. 2 ). The fossils occur in the upper few millimetres of the dolostone beds where they are overlain by shale. The Big Hill biota, comprising some 31 taxa, includes benthic and demersal components ( Fig. 3 ): medusae, lingulid brachiopods and chasmataspidid arthropods...
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Journal Article
Journal: PALAIOS
Published: 01 September 2012
PALAIOS (2012) 27 (9): 617-626.
.... King J.M. 1985 , The distance demersal zooplankton migrate above the benthos: Implications for predation : Marine Biology , v. 84 , p. 253 – 260 . Auclair A.C. Lecuyer...
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Journal Article
Published: 01 March 2010
Journal of Paleontology (2010) 84 (2): 267-287.
... interior, producing a siphuncle band. The skeleton was produced by a deep-bodied animal of demersal life habits. The species B. uncinata, B. harrisi and B. alabamensis voltzi proposed by Palmer (1937) are synonymised with B. ungula. The species B. veatchii and B. saccaria of Palmer (1937) are considered...
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Series: Geological Society, London, Memoirs
Published: 01 January 2013
DOI: 10.1144/M38.28
EISBN: 9781862396425
... is Early Cambrian in age. The first taxa with mineralized exoskeletons are at least Ordovician in age, followed by a sporadic fossil record with Talimaa’s Gap of c. 3 myr in the Rhuddanian (earliest Silurian). Ordovician and Silurian vertebrate faunas are dominated by ‘agnathans’. Early Palaeozoic...
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Journal Article
Published: 11 April 2017
Journal of Paleontology (2017) 91 (3): 512-547.
... of the richest shark faunas from the Neotropics. Strontium geochronology indicates an age of 10–9.5 Ma for the chonrichthyan-bearing strata. Field efforts resulted in 1429 identifiable specimens comprising at least 31 taxa, of which at least eight are new to the documented fossil...
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Journal Article
Journal: Paleobiology
Published: 01 May 2008
Paleobiology (2008) 34 (2): 210-228.
... phyla; the class-level database is the nested subset of occurrences of eight classes. Occurrences are the sum of all individ ual genus (or genus-equivalent) occurrences across all time bins; taxa occurring in more than one bin will have multiple occurrences. All other taxonomic totals are measures...
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Journal Article
Published: 01 September 2008
Journal of Paleontology (2008) 82 (5): 996-1008.
... fidelity and by a contemporaneous reduced spatial resolution (see Behrensmeyer et al., 2000 ). Although a detailed analysis of the fauna has not been accomplished yet, it is evident that it was characterized by a mixture of epipelagic, mesopelagic, deep-sea demersal, and bathypelagic taxa. Obviously...
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Journal Article
Journal: Paleobiology
Published: 01 January 2001
Paleobiology (2001) 27 (2): 369-378.
... that influences sensitivity to sound ( Popper and Hoxter 1981 ). In all the fossil species studied, as well as in T. minutus, there was a marked change from the larval to the juvenile stage. This corresponds to the ontogenetic development of T. minutus from epipelagic early development to demersal habitat (E...
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