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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.
... 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. The taxonomic...
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Journal Article
Journal: PALAIOS
Published: 01 April 2016
PALAIOS (2016) 31 (4): 122-124.
... the early Norian, in particular pectinids and ostreids. Overall, the changes in Norian paleoecological structure of benthic 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...
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Journal Article
Journal: Paleobiology
Published: 01 June 2012
Paleobiology (2012) 38 (3): 424-446.
... morphotypes. Each hypothetical life mode is represented. Highest concentration is in the field between planorbicones and platycones, in the shape space for which the demersal life mode is one hypothesis. Morphospace nearest the top leg of the triangle is the least occupied. This area corresponds to very low...
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Journal Article
Published: 04 May 2010
Geological Magazine (2010) 147 (6): 860-870.
... 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 that forthcoming taxonomical...
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: Paleobiology
Published: 27 April 2015
Paleobiology (2015) 41 (3): 387-401.
... sealers (this study) suggests that the current resource partitioning between demersal South American sea lions and epipelagic South American fur seals (Franco-Trecu et al. 2012 ) is an artifact resulting from human exploitation, and the same might be true for other sympatric pairs...
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Journal Article
Journal: PALAIOS
Published: 01 April 2016
PALAIOS (2016) 31 (4): 190-202.
... deposits are reported in the Nun Mine Member. They may have cemented to other shells or to other cemented sediments near or on the seafloor. One of the most common bivalve taxa from NYC proved to be problematic for identification. These specimens are likely to belong to the same taxon originally identified...
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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: 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: Geology
Published: 01 December 2005
Geology (2005) 33 (12): 929-932.
... that by physiological necessity feed primarily on organic detritus and demersal bacteria (discussed in Peterson et al., 2005 ). It was not until the Early Ordovician that tiered suspension-feeding communities with the capacity to feed upon metazoan larvae begin to compose a significant fraction of the benthic...
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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.
... specimen, which represents the sole mineralized component of the arthropod fauna. The Big Hill biota, comprising some 31 taxa, includes benthic and demersal components ( Fig. 3 ): medusae, lingulid brachiopods and chasmataspidid arthropods are the most common elements. Macroalgae ( Fig. 3a and b...
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Journal Article
Journal: PALAIOS
Published: 01 September 2012
PALAIOS (2012) 27 (9): 617-626.
... oxygen isotope values for these ammonites as indicative of growth in near-surface waters. This conflicts with the interpretation as a deep marine nektobenthic life habit and with data from Late Cretaceous (Campanian) planispiral taxa recorded by Moriya et al. (2003) . Based on δ 18 O paleotemperature...
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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: 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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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 combined (Arthropoda, Brachiopoda, Echinodermata, and Mollusca, hereafter termed the overall trend), in these four phyla separately, and in eight major constituent classes (Trilobita, Lingulata, Rhynchonellata, Strophomenata, Crinoidea, Bivalvia, Cephalopoda, and Gastropoda), taxa chosen because...
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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.
... taxa and locations. Combining these methods with the isotope analysis of carbonate material of well-defined growth zones, as Patterson (1998) did with Holocene otoliths of freshwater drum ( Aplodinotus grunniens ), will improve the accuracy of paleoenvironmental research. Fish otoliths are very...
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