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- Title
Developmental stages in diapausing eggs: an investigation across monogonont rotifer species.
- Authors
Boschetti, Chiara; Leasi, Francesca; Ricci, Claudia
- Abstract
Monogononts reproduce by parthenogenesis punctuated by events of mixis that generate 'resting eggs', which actually are embryos whose development is arrested. We document the nuclei number and position of the resting eggs of nine rotifer species ( Brachionus plicatilis, B. calyciflorus, B. manjavacas, Plationus patulus, Epiphanes senta, E. chihuahuaensis, Rhinoglena frontalis, Lecane bulla and Sinantherina socialis) in the attempt to assess the stage at which dormant embryos are arrested. The morphology of the entire embryos was reconstructed visualising nuclear DNA using confocal microscopy, and their developmental stage identified. Two groups of species were identified: dormant embryos of one group possessed on average less than 30 nuclei, with low variation within and between species, and the stage may correspond to early gastrula; embryos in the second group contain relatively more nuclei, averaging around 40-60, with higher variation within species. The two groups of species seem not to reflect any phylogenetic relationship. Consequences of the dormant embryo stages are discussed.
- Subjects
MONOGONONTA; ROTIFERA; EMBRYOLOGY; ANIMAL species; PHYLOGENY
- Publication
Hydrobiologia, 2011, Vol 662, Issue 1, p149
- ISSN
0018-8158
- Publication type
Article
- DOI
10.1007/s10750-010-0490-6