AustralieFrV1, Main, Exploration, bibRecord, 003495

Subcellular preservation in giant ostracod sperm from an early Miocene cave deposit in Australia

Identifieur interne : 003495 ( Main/Exploration ); précédent : 003494; suivant : 003496

Subcellular preservation in giant ostracod sperm from an early Miocene cave deposit in Australia

Auteurs : Renate Matzke-Karasz [Allemagne] ; John V. Neil [Australie] ; Robin J. Smith [Japon] ; Radka Symonová [République tchèque] ; Libor Mo Kovsk [République tchèque] ; Michael Archer [Australie] ; Suzanne J. Hand [Australie] ; Peter Cloetens [France] ; Paul Tafforeau [France]

Source :

Proceedings of the Royal Society B: Biological Sciences [ 0962-8452 ] ; 2014.

RBID : PMC:4046408

Descripteurs français

KwdFr :
- Animaux, Australie, Crustacea (ultrastructure), Fossiles, Grottes, Microscopie électronique à balayage, Microscopie électronique à transmission, Microtomographie aux rayons X, Mâle, Queensland, Spermatozoïdes (ultrastructure), Évolution biologique.
MESH :
- Animaux, Australie, Crustacea, Fossiles, Grottes, Microscopie électronique à balayage, Microscopie électronique à transmission, Microtomographie aux rayons X, Mâle, Queensland, Spermatozoïdes, Évolution biologique.
Wicri :
- geographic : Australie.

English descriptors

KwdEn :
- Animals, Australia, Biological Evolution, Caves, Crustacea (ultrastructure), Fossils, Male, Microscopy, Electron, Scanning, Microscopy, Electron, Transmission, Queensland, Spermatozoa (ultrastructure), X-Ray Microtomography.
MESH :
- geographic : Australia, Queensland.
- ultrastructure : Crustacea, Spermatozoa.
- Animals, Biological Evolution, Caves, Fossils, Male, Microscopy, Electron, Scanning, Microscopy, Electron, Transmission, X-Ray Microtomography.

Abstract

Cypridoidean ostracods are one of a number of animal taxa that reproduce with giant sperm, up to 10 000 µm in length, but they are the only group to have aflagellate, filamentous giant sperm. The evolution and function of this highly unusual feature of reproduction with giant sperm are currently unknown. The hypothesis of long-term evolutionary persistence of this kind of reproduction has never been tested. We here report giant sperm discovered by propagation phase contrast X-ray synchrotron micro- and nanotomography, preserved in five Miocene ostracod specimens from Queensland, Australia. The specimens belong to the species Heterocypris collaris Matzke-Karasz et al. 2013 (one male and three females) and Newnhamia mckenziana Matzke-Karasz et al. 2013 (one female). The sperm are not only the oldest petrified gametes on record, but include three-dimensional subcellular preservation. We provide direct evidence that giant sperm have been a feature of this taxon for at least 16 Myr and provide an additional criterion (i.e. longevity) to test hypotheses relating to origin and function of giant sperm in the animal kingdom. We further argue that the highly resistant, most probably chitinous coats of giant ostracod sperm may play a role in delaying decay processes, favouring early mineralization of soft tissue.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4046408

DOI: 10.1098/rspb.2014.0394
PubMed: 24827442
PubMed Central: 4046408

Affiliations:

Allemagne, Australie, France, Japon, République tchèque

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<front><div type="abstract" xml:lang="en"><p>Cypridoidean ostracods are one of a number of animal taxa that reproduce with giant sperm, up to 10 000 µm in length, but they are the only group to have aflagellate, filamentous giant sperm. The evolution and function of this highly unusual feature of reproduction with giant sperm are currently unknown. The hypothesis of long-term evolutionary persistence of this kind of reproduction has never been tested. We here report giant sperm discovered by propagation phase contrast X-ray synchrotron micro- and nanotomography, preserved in five Miocene ostracod specimens from Queensland, Australia. The specimens belong to the species <italic>Heterocypris collaris</italic>
 Matzke-Karasz <italic>et al</italic>
. 2013 (one male and three females) and <italic>Newnhamia mckenziana</italic>
 Matzke-Karasz <italic>et al</italic>
. 2013 (one female). The sperm are not only the oldest petrified gametes on record, but include three-dimensional subcellular preservation. We provide direct evidence that giant sperm have been a feature of this taxon for at least 16 Myr and provide an additional criterion (i.e. longevity) to test hypotheses relating to origin and function of giant sperm in the animal kingdom. We further argue that the highly resistant, most probably chitinous coats of giant ostracod sperm may play a role in delaying decay processes, favouring early mineralization of soft tissue.</p>
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Serveur d'exploration sur les relations entre la France et l'Australie

Subcellular preservation in giant ostracod sperm from an early Miocene cave deposit in Australia

Subcellular preservation in giant ostracod sperm from an early Miocene cave deposit in Australia

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki

	Serveur d'exploration sur les relations entre la France et l'Australie
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