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- W2511689687 endingPage "160139" @default.
- W2511689687 startingPage "160139" @default.
- W2511689687 abstract "Directional asymmetry (DA) in body form is a widespread phenomenon in animals and plants alike, and a functional understanding of such asymmetries can offer insights into the ways in which ecology and development interface to drive evolution. Echinoids (sea urchins, sand dollars and their kin) with planktotrophic development have a bilaterally symmetrical feeding pluteus larva that undergoes a dramatic metamorphosis into a pentameral juvenile that enters the benthos at settlement. The earliest stage of this transformation involves a DA: a left-side invagination in mid-stage larvae leads to the formation of the oral field of the juvenile via a directionally asymmetric structure called the echinus rudiment. Here, we show for the first time in two echinoid species that there is a corresponding DA in the overall shape of the larva: late-stage plutei have consistently shorter arms specifically on the rudiment (left) side. We then demonstrate a mechanistic connection between the rudiment and arm length asymmetries by examining rare, anomalous purple urchin larvae that have rudiments on both the left and the right side. Our data suggest that this asymmetry is probably a broadly shared feature characterizing ontogeny in the class Echinoidea. We propose several functional hypotheses—including developmental constraints and water column stability—to account for this newly identified asymmetry." @default.
- W2511689687 created "2016-09-16" @default.
- W2511689687 creator A5005967987 @default.
- W2511689687 creator A5014813396 @default.
- W2511689687 creator A5051225465 @default.
- W2511689687 date "2016-08-01" @default.
- W2511689687 modified "2023-09-24" @default.
- W2511689687 title "A newly identified left–right asymmetry in larval sea urchins" @default.
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- W2511689687 doi "https://doi.org/10.1098/rsos.160139" @default.
- W2511689687 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5108941" @default.
- W2511689687 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27853591" @default.
- W2511689687 hasPublicationYear "2016" @default.
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