Muséum-Demidoff (mis en ordre systématique et décrit par G. Fischer) : Ou catalogue ... des curiosités de la Nature et de l'Art. données à l'Université impériale de Moscou par ... P. de Demidoff

Waldheim, Gotthelf Fischer von; Demidov, P. G.

doi:10.5962/bhl.title.160942

1806

DOI: 10.5962/bhl.title.160942

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Muséum-Demidoff (mis en ordre systématique et décrit par G. Fischer) : Ou catalogue ... des curiosités de la Nature et de l'Art. données à l'Université impériale de Moscou par ... P. de Demidoff

Gotthelf Fischer von Waldheim¹,

P. G. Demidov²

Abstract: Hellevoet-Sluys, Harwich, Londres où il arriva au mois de Septembre.Mr. de Demi do ff vifita toute l'Angleterre et une grande par¬ tie de l'Ecoffe. Je ne nomme que quelques endroits qui ont été l'objèt particulier de fa curiofité, favoir: Oxford,

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Cited by 8 publications

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“…Among the most spectacular of these agglutinating organisms is the carrier shell Xenophora Fischer von Waldheim, , a genus of marine gastropods. This taxon comprises species, known from the Cretaceous to the Recent, which have the ability to form their shells cementing various kinds of objects with different origins: coral skeletons and bivalve, gastropod, brachiopod and foraminifera shells, bioclasts and, in some species, also siliciclastic sand grains and rock fragments (Ponder & Cooper ; Lebrun et al ).…”

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confidence: 99%

How did the carrier shell Xenophora crispa (König, 1825) build its shell? Evidence from the Recent and fossil record

Crippa

Pasinetti

Dapiaggi

2020

LET

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The genus Xenophora comprises species of marine gastropods (Cretaceous-Recent) able to add fragments of various origins to their shells surface. Agglutination potentials vary, from species lacking attachments to species completely covered by agglutinated materials, as in the Mediterranean species Xenophora crispa. Here, we analyse Recent and fossil specimens of Xenophora crispa from the Mediterranean area using SEM and XRD, to better understand their biomineralization patterns and the mechanisms leading to the agglutination of shells, bioclasts and lithoclasts, and their evolution in time. We also provide new data on poorly studied gastropod shell microstructures. We conclude that: a) most of the Xenophora crispa shell consists of an aragonitic crossed lamellar fabric, but fibrous to spherulitic prismatic fabrics, seemingly of calcite, have been found in the columella and peripheral edge (the thickest parts of the shell); b) the objects attachment is mediated by a prismatic microstructure, indicating that this may be the most functional fabric in attachment areas in molluscs; c) the functional purpose of the agglutination in Xenophora crispa may be related to a snowshoe strategy to successfully colonize muddy substrates, coupled with tactile and olfactory camouflage. Indeed, this species secretes in the columella and peripheral edge a less dense and a more organic rich calcitic fabric, possibly to lighten the shell thickest parts in order not to sink in soft sediments and to facilitate the shell raising from the substrate to create a protected feeding area. This behaviour seems to have been maintained by X. crispa over 2 My time span.

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mentioning

confidence: 99%

How did the carrier shell Xenophora crispa (König, 1825) build its shell? Evidence from the Recent and fossil record

Crippa

Pasinetti

Dapiaggi

2020

LET

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Oligocene and Early Miocene gastropods from Kutch (NW India) document an early biogeographic switch from Western Tethys to Indo-Pacific

et al. 2009

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Shallow marine gastropod assemblages from Chattian, Aquitanian and Burdigalian sections in the Indian Kutch Basin are described. They provide insight into the composition and biogeographic relations of the gastropod assemblages at this junction between the Western Tethys and Proto-Indo-Pacific Ocean. For the first time, an improved biostratigraphy allows a clear separation of the assemblages, especially for the hitherto undifferentiated Early Miocene faunas. Throughout the Oligocene, about one-third of the species are also frequently found in the Western Tethys, documenting a passable Tethyan Seaway for nearshore molluscs. A considerable provincialism is evident as well. The expected turnover during the Early Miocene, due to the closing of the Tethyan Seaway, is reflected in the Miocene assemblages. Surprisingly, however, the cut appears very early, i.e. already during the Aquitanian, when the West-East interrelation drops to zero despite the passage having been open during this interval. In contrast, the Burdigalian assemblages witness a minor re-appearance of Western Tethys taxa, suggesting the re-establishment of rather ineffective migration pathways prior to the final closure of the Tethyan Seaway. Cerithium bermotiense and Lyria (Indolyria) maniyaraensis are introduced as new species.

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First report of overlooked marine gastropods from India concerning their geographical distribution

2022

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Muséum-Demidoff (mis en ordre systématique et décrit par G. Fischer) : Ou catalogue ... des curiosités de la Nature et de l'Art. données à l'Université impériale de Moscou par ... P. de Demidoff

Abstract: Hellevoet-Sluys, Harwich, Londres où il arriva au mois de Septembre.Mr. de Demi do ff vifita toute l'Angleterre et une grande par¬ tie de l'Ecoffe. Je ne nomme que quelques endroits qui ont été l'objèt particulier de fa curiofité, favoir: Oxford,

Cited by 8 publications

References 0 publications

How did the carrier shell Xenophora crispa (König, 1825) build its shell? Evidence from the Recent and fossil record

How did the carrier shell Xenophora crispa (König, 1825) build its shell? Evidence from the Recent and fossil record

Oligocene and Early Miocene gastropods from Kutch (NW India) document an early biogeographic switch from Western Tethys to Indo-Pacific

First report of overlooked marine gastropods from India concerning their geographical distribution

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