How To Use Planula In A Sentence
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(A) Oblique section of a possible fossil anthozoan planula.
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The planulae of most cnidarians attach and lose, at most, a coat of swimming cilia.
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Each expression pattern is represented by a red shading on the planula, polyp or medusa diagrams.
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It was afterwards shown that this planula (found in several sponges, etc.) was a later evolution from the gastrula.
The Evolution of Man — Volume 1
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Fertilized eggs develop into crawling planula larvae which settle on hermit crab-occupied shells, and subsequently metamorphose into primary polyps.
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The planulae are of a range of sizes with the larger planulae having the longer survivorship, suggesting a strategy that accommodates both short and long-distance dispersal
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Scientists believe that corals at the Flower Gardens probably originated from Mexican reefs when currents in the western Gulf of Mexico carried coral larvae (planulae), other animal larvae, and algal spores northward.
Flower Garden Banks National Marine Sanctuary
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Fertilized eggs may be brooded for a time or may develop directly into a free-swimming, ciliated planula larva.
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Shell lenticular, thin, diaphanous, imperforate; carina acute and armed with minute spines; whirls six; spire nearly planular; aperture linear, being guarded by a long tooth on the columella; outer lip irregularly thick, angulated near the supe - rior termination ....,
Transactions of the American Philosophical Society
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The planula larva has very few apoptotic cells.
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Section of Magosphaera planula, showing how the pear-shaped cells in the centre of the gelatinous ball are connected by a fibrous process.
The Evolution of Man — Volume 2
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~5\% of the planulae can remain competent to settle for >
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(B) Schematic view of a transverse section of the late planula of the anthozoan Euphyllia rugosa.
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This complicated bilayered structure is typical of anthozoan late planula larvae.
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Nangi limped toward the high-backed chairs and, as he came round the side, saw that the one nearest him was occupied by a petite but noble-looking woman with pale, translucent skin, planular cheekbones and black, fiery almond eyes.
The Kaisho
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Among the 7 examined genes, only those belonging to the HOX9-14 and the CDX groups exhibit a restricted expression along the oral-aboral axis during development and in the planula larva, while the others are expressed in very specialised areas at the medusa stage.
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The wall of the planula is next pushed in on one side, or invaginated, whereby it is converted into a double-walled sac with an opening, the _blastopore_, which leads into the cavity lined by the inner wall.
Darwiniana : Essays — Volume 02
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Fertilized eggs may be brooded for a time or may develop directly into a free-swimming, ciliated planula larva.
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Ayre DJ, Resing JM (1986) Sexual and asexual production of planulae in reef corals.
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The Norwegian Magosphaera planula, swimming about by means of the lashes or cilia at its surface.
The Evolution of Man — Volume 2
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The planula larva settles on a hermit crab shell and metamorphoses into a primary polyp.
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The presence of algal endosymbionts in the planulae may increase their survival as these are an important energy source
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Isomura N, Nishihira M (2001) Size variation of planulae and its effect on the lifetime of planulae in three pocilloporid corals.
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After fertilization, the egg grows into a 'planula' (which is described above as a cilia covered larvae) then finds a spot to temporarily and finishes its last stage of life as a full grown
CreationWiki - Recent changes [en]
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He denied that the invagination opening (which he named the blastopore) represented the primitive mouth, [443] holding that this was typically formed by an "inruptive" process at the anterior end of the planula, which led to the formation of a "stomodæum.
Form and Function A Contribution to the History of Animal Morphology
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(planulae), other animal larvae, and algal spores northward.
Featured Articles - Encyclopedia of Earth
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Planula" theory, according to which the ancestral form of the Metazoa was a two-layered closed sac formed typically by delamination, less often by invagination.
Form and Function A Contribution to the History of Animal Morphology
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Rhopalura Giardi (Julin): Figure 3 male, Figure 4 female, Figure 5 planula.
The Evolution of Man — Volume 2
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To the fourth stage he assigns the planæa, corresponding to the embryonic development of an albumen and the planula or ciliated {48} larva.
The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality
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Based on the position of the Wnt centre, the oral end of cnidarian planulae and polyps seems homologous to the rear end of the Bilateria
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Clytia HOX9-14 group C gene CheHox9-14C, expressed at the aboral pole of the planula, is orthologous to
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Some said that the original embryonic form of the metazoa was not the gastrula, but the "planula" -- a double-walled vesicle with closed cavity and without mouth-aperture; the latter was supposed to pierce through gradually.
The Evolution of Man — Volume 1
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Hydra lives in freshwater, lacks a ciliated planula, and has clearly lost a medusa stage during its ancestry.
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In the adult, or medusa stage of a jellyfish, they can reproduce sexually by releasing sperm and eggs into the water, forming a planula.
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Although we cannot completely exclude a nonbiological or nonmetazoan origin, we identified what appear to be modern cnidarian developmental stages, including both anthozoan planula larvae and hydrozoan embryos.
