Nacre in Molluscs from the Ordovician of the Midwestern United States

Vendrasco, Michael J.; Checa, António; Heimbrock, William P.; Baumann, Steven D. J.

doi:10.3390/geosciences3010001

Cited by 31 publications

(25 citation statements)

References 43 publications

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“…), nacreous mother of pearl appears to have evolved multiple times convergently in molluscs in the Ordovician period (Vendrasco et al . , ) as a response to the increased predation pressure of the GOBE.…”

Section: Conchiferan Evolutionmentioning

confidence: 99%

The origins of molluscs

Vinther

2014

Palaeontology

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The interrelationships and evolutionary history of molluscs have seen great advances in the last decade. Recent phylogenetic studies have allowed alternative morphology-based evolutionary scenarios to be tested and, most significantly, shown that the aplacophorans are sister group to polyplacophorans (chitons), corroborating palaeontological and embryological evolutionary scenarios in which aplacophorans are secondarily simplified from a chiton-like ancestor. Aplacophoran morphology therefore does not represent the plesiomorphic condition for molluscs as a whole. The mollusc crown group radiated in the Early Cambrian, and rapidly thereafter, stem lineages to the major molluscan classes emerged: cephalopods, gastropods, bivalves (= pelecypods), monoplacophorans, rostroconchs (inferred stem scaphopods) and aculiferans. This attests to the fast, adaptive radiation of the crown group during the Cambrian explosion. Kimberella from the latest Ediacaran exhibits several molluscan traits, which justifies its position as a molluscan stem-group member, rather than as a more basal Lophotrochozoan. The interrelationships among the conchiferan molluscs are still a matter of contention and require further palaeontological and molecular phylogenetic scrutiny.

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Section: Conchiferan Evolutionmentioning

confidence: 99%

The origins of molluscs

Vinther

2014

Palaeontology

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“…Temperature (Carter et al 1998) and various biological factors such as predation (Carter 1980) clearly contribute to the relative fitness of calcite versus aragonite, but the relative importance of these selective pressures is at present unclear. Predatory pressure increased during the Great Ordovician Biodiversification Event, and this correlates with the apparent independent evolution of nacre in many groups of molluscs (Vendrasco et al 2013). Perhaps at this time selective pressure via predation outweighed the push of seawater chemistry.…”

Section: Commonality Of Calcite In Shells Of Cambrian Molluscsmentioning

confidence: 93%

“…Mutvei 1997) potentially allows the inference of broad-scale evolutionary patterns. Recent data from the Ordovician suggest that the aragonitic shell microstructure nacre was fairly widespread by this time (Vendrasco et al 2013; MJV, personal observation).…”

Section: Introductionmentioning

confidence: 91%

Shell microstructure and its inheritance in the calcitic helcionellidMackinnonia

Vendrasco¹,

Checa²

2015

Estonian J. Earth Sci.

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Mackinnonia davidi from the Cambrian (Series 2) of Australia has a prismatic outer shell layer and, as newly described here, a calcitic semi-nacre inner layer. The pattern is the same as in stenothecids such as Mellopegma, providing more evidence for a strong phylogenetic signal in the shell microstructure of Cambrian molluscs. In addition, calcite now appears to have been common in helcionellids and other molluscs during the early and middle Cambrian, with many species exhibiting foliated calcite. This is surprising given the dominance of aragonite in molluscs, both modern and from post-Cambrian fossil deposits with exceptional shell microstructure preservation, including localities from the Ordovician of the Cincinnati region, USA.

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“…and Orthoceratida ( Isorthoceras sociale ) from the Ordovician (Mutvei , b; Vendrasco et al . ). An aragonitic mineralogy is also corroborated by Palaeozoic (Ordovician to Carboniferous) and more recent fossil faunas with original (partially) aragonitic preservation (Stehli ; Hallam & O'Hara ; Grandjean et al .…”

mentioning

confidence: 97%

Evidence for Palaeozoic orthoconic cephalopods with bimineralic shells

Baets

Munnecke

2017

Palaeontology

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Based on the aragonite composition of extant and exceptionally preserved fossil cephalopods going back to the early Palaeozoic, it is commonly assumed that all externally shelled cephalopods had an aragonitic shell wall. We demonstrate herein that at least two taxa of Siluro-Devonian orthoconic nautiloids (Dawsonoceras, Spyroceras) had an original bimineralic shell, which developed convergently with gastropods and bivalves.

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Nacre in Molluscs from the Ordovician of the Midwestern United States

Cited by 31 publications

References 43 publications

The origins of molluscs

The origins of molluscs

Shell microstructure and its inheritance in the calcitic helcionellidMackinnonia

Evidence for Palaeozoic orthoconic cephalopods with bimineralic shells

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