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NameEreskovsky, A. V.; Boury-Esnault, N. (2002). Cleavage pattern in Oscarella species (Porifera, Demospongiae,Homoscleromorpha): transmission of maternal cells and symbiotic bacteria. Journal of Natural History, 36, 1761-1775
AuthorsEreskovsky, A. V.; Boury-Esnault, N.
Year2002
TitleCleavage pattern in Oscarella species (Porifera, Demospongiae,Homoscleromorpha): transmission of maternal cells and symbiotic bacteria
JournalJournal of Natural History
Suffix36: 1761-1775
Type Publication
Full textEreskovsky & Boury-Esnault 2002CleavOsc.pdf OpenAccess publication
AbstractThe cleavage and the first stages of development of larvae in five Oscarella species, from the north-west Mediterranean, O. lobularis, O. tuberculata, O. imperialis, O. microlobata and Oscarella sp., are investigated. Eggs are isolecithal, and rich in yolk inclusions. The cleavage is holoblastic, equal and asynchronous. During cleavage, there is no central cavity (blastocoel ). The result of cleavage is the formation of a solid morula constituted by equal blastomeres. The polarity of the blastomeres is not expressed prior to the beginning of larva diVerentiation, i.e. approximately up to 64-cell stage. The superficial membrane of the blastomeres shows numerous filopodia which form blastomere contact. Symbiotic bacteria and cells with inclusions of the maternal mesohyl are present in the intercellular spaces of the embryo from the beginning of cleavage. Whereas maternal symbiotic bacteria are present in the embryo of the five species studied, maternal cells with inclusions are absent from two species (O. tuberculata and O. microlobata). The most original feature of early development in the genus Oscarella is the formation of a coeloblastula larva from a morula due to the progressive migration of the internal cells to the periphery.
Geographical
term
Mediterranean Sea in general
Bibliographical
term
Reproduction
Taxonomic
term
Porifera
Taxa
(1)
Checked: verified by a taxonomic editorOscarella lobularis (Schmidt, 1862) (additional source)
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2013-01-12 18:30:12Z  created  db_admin
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