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Living Monoplacophora: morphological conservatism or recent diversification?

Identifieur interne : 000577 ( Istex/Curation ); précédent : 000576; suivant : 000578

Living Monoplacophora: morphological conservatism or recent diversification?

Auteurs : Yasunori Kano ; Shoichi Kimura ; Taeko Kimura ; Anders Warén

Source :

RBID : ISTEX:0C2BDA6B902B2260156B2463171CDB5CB8084277

Descripteurs français

English descriptors

Abstract

Kano, Y., Kimura, S., Kimura, T. & Warén, A. (2012) Living Monoplacophora: morphological conservatism or recent diversification? —Zoologica Scripta, 41, 471–488. The molluscs of the class Monoplacophora are classic and probably the most striking case of a ‘living fossil’ in the deep sea. Until the discovery of the first living specimens in 1950s, the group was thought to be extinct since the Devonian period, almost 400 million years ago. Morphological conservatism over a long span of time in a ‘living‐fossil’ lineage may theoretically result in distant but closely resembling taxa, and this idea apparently led some authors to recognise as many as six families and three superfamilies for less than three dozen living monoplacophoran species. However, no genetic or fossil data have been available regarding the history of their diversification. Here we describe Veleropilina seisuimaruae sp. n., the first member of the class from the north‐western Pacific, based on the shell, radular and anatomical characteristics. Phylogenetic analyses of 6‐kb DNA sequences estimate that the divergence of V. seisuimaruae and Laevipilina hyalina, the only other monoplacophoran available for genetic studies, dates back only to the Late Cretaceous, despite their significant morphological differences among the living members of the class. The recent Monoplacophora might have radiated fairly recently from a cryptic lineage with ordinary rates of morphological evolution, possibly after the global deep‐sea anoxia at the Cenomanian/Turonian boundary.

Url:
DOI: 10.1111/j.1463-6409.2012.00550.x

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ISTEX:0C2BDA6B902B2260156B2463171CDB5CB8084277

Le document en format XML

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<term>Apical</term>
<term>Arntzi</term>
<term>Bayesian</term>
<term>Bayesian analyses</term>
<term>Bivalvia</term>
<term>Body size</term>
<term>Bouchet</term>
<term>California press</term>
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<term>Chiton</term>
<term>Clade</term>
<term>Class monoplacophora</term>
<term>Concatenated</term>
<term>Concatenated data</term>
<term>Concentric</term>
<term>Concentric ribs</term>
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<term>Cusp</term>
<term>Data sets</term>
<term>Dautzenberg fisher</term>
<term>Devonian</term>
<term>Divergence</term>
<term>Divergence date</term>
<term>Divergence time estimates</term>
<term>Eighth data</term>
<term>Euglypta</term>
<term>Evolutionary biology</term>
<term>Evolutionary rates</term>
<term>Extant species</term>
<term>Fauna</term>
<term>Fossil</term>
<term>Fossil record</term>
<term>Fourth teeth</term>
<term>Gage tyler</term>
<term>Galathea report</term>
<term>Gastropoda</term>
<term>Genus</term>
<term>Gill</term>
<term>Giribet</term>
<term>Gofas</term>
<term>Granular material</term>
<term>Hain</term>
<term>Haszprunar</term>
<term>Haszprunar schaefer</term>
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<term>Ivanov moskalev</term>
<term>Jablonski lutz</term>
<term>Jacobs lindberg</term>
<term>Kano</term>
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<term>Laevipilina antarctica</term>
<term>Laevipilina hyalina</term>
<term>Larger species</term>
<term>Late cretaceous</term>
<term>Lateral</term>
<term>Lemche</term>
<term>Lindberg</term>
<term>Lineage</term>
<term>Mclean</term>
<term>Menzies</term>
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<term>Molluscan</term>
<term>Molluscan studies</term>
<term>Monoplacophora</term>
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<term>Monoplacophoran</term>
<term>Monoplacophoran species</term>
<term>Monoplacophorans</term>
<term>Monoplacophorus</term>
<term>Morphological conservatism</term>
<term>Moskalev</term>
<term>Natural history</term>
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<term>Neopilinidae</term>
<term>Norwegian</term>
<term>Norwegian academy</term>
<term>Other species</term>
<term>Outer shell layer</term>
<term>Ozawa</term>
<term>Paedomorphic evolution</term>
<term>Palaeontological evidence</term>
<term>Phylogenetic</term>
<term>Phylogeny</term>
<term>Polyplacophora</term>
<term>Posterior probabilities</term>
<term>Postoral</term>
<term>Postoral ridge</term>
<term>Present species</term>
<term>Radula</term>
<term>Radular</term>
<term>Recent monoplacophora</term>
<term>Reticulate</term>
<term>Rib</term>
<term>Rokopella</term>
<term>Round depressions</term>
<term>Royal society</term>
<term>Rrna</term>
<term>Ruthensteiner</term>
<term>Scripta</term>
<term>Second teeth</term>
<term>Segonzaci</term>
<term>Seisuimaruae</term>
<term>September</term>
<term>Serialia</term>
<term>Shell length</term>
<term>Shima peninsula</term>
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<term>Surface sculpture</term>
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<term>Taxonomic</term>
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<term>Third tooth</term>
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<term>Vema</term>
<term>Waren</term>
<term>Waren bouchet</term>
<term>Waren gofas</term>
<term>Waren hain</term>
<term>Wingstrand</term>
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<term>Zoologica scripta</term>
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<term>Adenopilina</term>
<term>Antarctica</term>
<term>Apical</term>
<term>Arntzi</term>
<term>Bayesian</term>
<term>Bayesian analyses</term>
<term>Bivalvia</term>
<term>Body size</term>
<term>Bouchet</term>
<term>California press</term>
<term>Cambrian</term>
<term>Chiton</term>
<term>Clade</term>
<term>Class monoplacophora</term>
<term>Concatenated</term>
<term>Concatenated data</term>
<term>Concentric</term>
<term>Concentric ribs</term>
<term>Cretaceous</term>
<term>Cusp</term>
<term>Data sets</term>
<term>Dautzenberg fisher</term>
<term>Devonian</term>
<term>Divergence</term>
<term>Divergence date</term>
<term>Divergence time estimates</term>
<term>Eighth data</term>
<term>Euglypta</term>
<term>Evolutionary biology</term>
<term>Evolutionary rates</term>
<term>Extant species</term>
<term>Fauna</term>
<term>Fossil</term>
<term>Fossil record</term>
<term>Fourth teeth</term>
<term>Gage tyler</term>
<term>Galathea report</term>
<term>Gastropoda</term>
<term>Genus</term>
<term>Gill</term>
<term>Giribet</term>
<term>Gofas</term>
<term>Granular material</term>
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<term>Haszprunar</term>
<term>Haszprunar schaefer</term>
<term>Hyalina</term>
<term>Ivanov moskalev</term>
<term>Jablonski lutz</term>
<term>Jacobs lindberg</term>
<term>Kano</term>
<term>Kimura</term>
<term>Laevipilina</term>
<term>Laevipilina antarctica</term>
<term>Laevipilina hyalina</term>
<term>Larger species</term>
<term>Late cretaceous</term>
<term>Lateral</term>
<term>Lemche</term>
<term>Lindberg</term>
<term>Lineage</term>
<term>Mclean</term>
<term>Menzies</term>
<term>Menzies layton</term>
<term>Micropilina</term>
<term>Micropilina arntzi</term>
<term>Minuta</term>
<term>Molecular data</term>
<term>Molecular phylogenetics</term>
<term>Molecular phylogeny</term>
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<term>Mollusca</term>
<term>Molluscan</term>
<term>Molluscan studies</term>
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<term>Monoplacophorus</term>
<term>Morphological conservatism</term>
<term>Moskalev</term>
<term>Natural history</term>
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<term>Neopilinidae</term>
<term>Norwegian</term>
<term>Norwegian academy</term>
<term>Other species</term>
<term>Outer shell layer</term>
<term>Ozawa</term>
<term>Paedomorphic evolution</term>
<term>Palaeontological evidence</term>
<term>Phylogenetic</term>
<term>Phylogeny</term>
<term>Polyplacophora</term>
<term>Posterior probabilities</term>
<term>Postoral</term>
<term>Postoral ridge</term>
<term>Present species</term>
<term>Radula</term>
<term>Radular</term>
<term>Recent monoplacophora</term>
<term>Reticulate</term>
<term>Rib</term>
<term>Rokopella</term>
<term>Round depressions</term>
<term>Royal society</term>
<term>Rrna</term>
<term>Ruthensteiner</term>
<term>Scripta</term>
<term>Second teeth</term>
<term>Segonzaci</term>
<term>Seisuimaruae</term>
<term>September</term>
<term>Serialia</term>
<term>Shell length</term>
<term>Shima peninsula</term>
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<term>Surface sculpture</term>
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<term>Taxonomic</term>
<term>Tentacle</term>
<term>Third tooth</term>
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<term>Type species</term>
<term>Veleronis</term>
<term>Veleropilina</term>
<term>Veleropilina seisuimaruae</term>
<term>Vema</term>
<term>Waren</term>
<term>Waren bouchet</term>
<term>Waren gofas</term>
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<div type="abstract" xml:lang="en">Kano, Y., Kimura, S., Kimura, T. & Warén, A. (2012) Living Monoplacophora: morphological conservatism or recent diversification? —Zoologica Scripta, 41, 471–488. The molluscs of the class Monoplacophora are classic and probably the most striking case of a ‘living fossil’ in the deep sea. Until the discovery of the first living specimens in 1950s, the group was thought to be extinct since the Devonian period, almost 400 million years ago. Morphological conservatism over a long span of time in a ‘living‐fossil’ lineage may theoretically result in distant but closely resembling taxa, and this idea apparently led some authors to recognise as many as six families and three superfamilies for less than three dozen living monoplacophoran species. However, no genetic or fossil data have been available regarding the history of their diversification. Here we describe Veleropilina seisuimaruae sp. n., the first member of the class from the north‐western Pacific, based on the shell, radular and anatomical characteristics. Phylogenetic analyses of 6‐kb DNA sequences estimate that the divergence of V. seisuimaruae and Laevipilina hyalina, the only other monoplacophoran available for genetic studies, dates back only to the Late Cretaceous, despite their significant morphological differences among the living members of the class. The recent Monoplacophora might have radiated fairly recently from a cryptic lineage with ordinary rates of morphological evolution, possibly after the global deep‐sea anoxia at the Cenomanian/Turonian boundary.</div>
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