Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun zoology Any
animal that exhibits aspiral cleavage pattern (typicallymolluscs )
Etymologies
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Examples
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Remarkably, 'spiralian' taxa have evolved disparate adult body plans, yet retain a close correspondence between early embryonic cell lineage
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The schematic cell lineage table at bottom shows the typical relationships of the quadrants, and indicates the parallel generation of micromeres and micromere sublineages in the four quadrants of a generalized spiralian embryo. doi: 10.1371 / journal. pone.0005506.g001
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Our present understanding of spiralian cell fate specification owes much to studies of the mud snail
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Most spiralian embryos exhibit tier-specific patterns of cell division at early stages; the significance of this mitotic asynchrony is unknown, but presumably reflects differential inheritance of factors regulating cell division.
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Thus, while the third cleavage in a frog, sea urchin or jellyfish embryo separates four animal ( 'northern') cells from vegetal ( 'southern') sister cells, third cleavage in a spiralian embryo separates four 'northwestern' cells from
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In general, complex patterns of early lineage-specific differentiation seem to have evolved at the bases of several higher-level spiralian clades
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Unlike other animal embryos, spiralian early cleavage planes are never perpendicular to the AV axis.
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One might expect that due to metabolic noise, cell division timing should become progressively less predictable as development proceeds; such time-dependent decorrelation has indeed been noted in an early study of spiralian cell lineage
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(A) Morphogenetic transformation of the rotationally symmetric spiralian embryo to a dorsoventrally polarized juvenile animal, as inferred from fate-mapping and other descriptive studies.
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For the most part, each micromere clone in a spiralian embryo remains largely cohesive throughout embryogenesis, and adopts a highly predictable fate
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