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demersal taxa

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Journal Article
Journal: PALAIOS
Published: 01 August 2012
PALAIOS (2012) 27 (8): 585-593.
..., but the earliest iteration of this increased pressure resulted in a clear shift toward avoidance of epifaunal and demersal shell-crushing predation. 1 palaios.ku.edu FIGURE 8— Timescale showing various predator taxa, prey taxa with anti-predator adaptations, and other key events in the Mesozoic. Thick black...
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Journal Article
Journal: PALAIOS
Published: 01 March 2011
PALAIOS (2011) 26 (3): 160-172.
... 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 composition of the assemblage definitely reflects fully marine shallow-water conditions...
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Journal Article
Journal: PALAIOS
Published: 01 April 2016
PALAIOS (2016) 31 (4): 122-124.
... 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 incapable of escaping or resisting predation...
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Journal Article
Journal: Paleobiology
Published: 01 June 2012
Paleobiology (2012) 38 (3): 424-446.
... each recognized morphotype and many shapes between 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...
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Journal Article
Published: 04 May 2010
Geological Magazine (2010) 147 (6): 860-870.
... al . 2005 ). However, the remarkable 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...
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.
... proposed to be the major determinant of diet composition in South American sea lions (Drago et al. 2009 , 2010 ), as they consume primarily large prey that feed near the bottom (demersal hereafter) when and where the population is small (Koen Alonso et al. 2000 ; Drago et al...
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Journal Article
Journal: PALAIOS
Published: 01 April 2016
PALAIOS (2016) 31 (4): 190-202.
... function of a taxon is debated; for example, the paper-clam Halobia is interpreted as either benthic epifauna ( McRoberts 2010 ) or epiplanktonic (attached to a floating substrate). Other taxa have life-modes that change over the lifetime of the organism; for example, Gryphaea had a juvenile cementing...
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Series: Geological Society, London, Memoirs
Published: 01 January 2013
DOI: 10.1144/M38.28
EISBN: 9781862396425
... of Sacabambaspis , after Gagnier (1993 a , b , 1995 ) and Pradel et al. (2006) , by courtesy of Pierre Bourcier (Paris) ©; the animal is c. 25–30 cm long. Abstract The oldest known Palaeozoic vertebrate record currently is Early Cambrian in age. The first taxa with mineralized exoskeletons...
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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.
.... Instead, the Cambrian suspension-feeding fauna was dominated by sponges, a group of animals 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...
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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
Journal: PALAIOS
Published: 01 September 2012
PALAIOS (2012) 27 (9): 617-626.
... for isotopic analysis. Sampling included the ammonites Acanthoceras tapara, Chimbuites miridowensis, Euomphaloceras cunningtoni, Euomphaloceras lonsdalei, Hypoturrilites gravesianus, Sciponoceras glaessneri, and Turrilites costatus. The latter three taxa are heteromorphic ammonites. Hypoturrilites gravesianus...
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Journal Article
Published: 09 September 2016
Journal of the Geological Society (2016) 174 (1): 18-22.
... , crinoids and dendroid graptolites ( Young et al. 2012 ). 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 ) are moderately abundant...
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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 2018
Paleobiology (2018) 44 (2): 251-262.
... and oceanographic Neogene events modulated the diversification trends of marine taxa in the TPSA (Valenzuela-Toro et al. 2013 ; Villafaña and Rivadeneira 2014 ). In addition, profound changes were observed in Neogene mollusk faunas along the TPSA (Rivadeneira and Marquet 2007 ; Kiel and Nielsen 2010 ). Recently...
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Journal Article
Journal: Paleobiology
Published: 01 May 2008
Paleobiology (2008) 34 (2): 210-228.
... morphology demonstrated they were nektobenthic or demersal members of benthic faunas (e.g., Frey 1989 ; Westermann 1999 ; Westermann and Tsujita 1999 ). To focus on typically preserved fossil taxa, I also discarded taxa with soft-part preservation, occasionally found in collections. Taxa for which body...
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Journal Article
Published: 01 September 2008
Journal of Paleontology (2008) 82 (5): 996-1008.
... deposits of the Yorba Member in the eastern sector of the Los Angeles Basin during the construction of a new metro rail line. Five taxa (Borophryne cf. apogon; Chaenophryne aff. melanorhabdus; Leptacanthichthys cf. gracilispinis; Linophryne cf. indica; Oneirodes sp.) belonging to two families...
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