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- W2071363684 abstract "The article analyses the relationships between mobile corals, the associated benthic fauna and the physical character of their substrates. Different types of coral mobility are here classified under three headings: (1) Passive rotation by water movement or by intervention of infaunal, benthic or nektic organisms. (2) Lifelong towing by a symbiotic sipunculid worm. (3) Auto-mobility, defined as self-induced movement which allows unburial, righting and lateral migration. In each case the morphology of the skeleton reflects the type of mobility, which can therefore be traced in the fossil record. Two examples of auto-mobile corals, Cycloseris (Recent) and Chomatoseris (= Anabacia) (Jurassic) are reviewed in detail; their main common architectural features are concentric growth and lack of epitheca. Both genera prefer loose, muddy sands. Mobility in corals allows them to flourish under circumstances unfavourable for sedentary forms. They are good indicators of loose, soft, sand substrates ranging from lagoonal through peri-reefal to deeper water environments. Though relatively few in species at any given time, mobile corals are geographically widespread and may be locally extremely abundant (>1500 per m2). World distribution maps are given for the Recent Cycloseris cyclolites, Diaseris distorta, Heteropsammia, Heterocyathus and Manicina areolata and for the Jurassic Chomatoseris.Cet article analyse Ies relations entre les coraux mobiles, la faune benthique associee et les proprietes physiques de leur substrat. On peut classer les differents types de mobilite chez les coraux selon trois categories: (1) Rotation passive due aux mouvements de l'eau, a l'intervention de l'endofaune, d'organismes benthoniques ou nectoniques. (2) Remorquage par un ver Sipunculide symbiotique. (3) Auto-mobilite, definie comme mouvements propres, permettant au polypier de s'extraire du sediment, de se retourner et de se deplacer lateralement. Dans tous les cas la morphologie du squelette est liee au type de mobilite qui peut done etre reconnu chez les fossiles. Deux exemples de coraux auto-mobiles sont ici revus en detail: Cycloseris (actuel) et Chomatoseris (=Anabacia) (Jurassique); les traits communs entre ces deux formes sont la croissance concentrique et l'absence d'epitheque. Les deux genres preferent les sables boueux meubles. La mobilite chez les coraux permet leur epanouissement dans des circonstances defavorables aux formes sedentaires. Ce sont de bons indicateurs de fond meuble (sable ou sable vaseux). On les trouve dans les lagons, les zones peri-recifales et jusque dans des eaux plus profondes. Les genres mobiles, dont le nombre connu est encore faible, ont cependant une large distribution geographique et peuvent localement etre representes par de nombreux individus (>1500 par m2). Des cartes de repartition mondiale sont etablies pour les coraux actuels Cycloseris cyclolites, Diaseris distorta, Heteropsammia, Heterocyathus, Manicina areolata et pour le genre jurassique Chomatoseris." @default.
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- W2071363684 date "1977-04-01" @default.
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- W2071363684 title "Mobility, growth patterns and substrate in some fossil and Recent corals" @default.
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- W2071363684 doi "https://doi.org/10.1111/j.1502-3931.1977.tb00601.x" @default.
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