Sea cucumbers symmetry (Echinodermata: Holothuroidea)

@article{Smirnov2014SeaCS,
  title={Sea cucumbers symmetry (Echinodermata: Holothuroidea)},
  author={Alexey V. Smirnov},
  journal={Paleontological Journal},
  year={2014},
  volume={48},
  pages={1215-1236}
}
  • A. Smirnov
  • Published 4 December 2014
  • Biology
  • Paleontological Journal
The types of symmetry that are characteristic for the class Holothuroidea and reflect different stages in the evolution of this group of echinoderms and the role of paedomorphosis in its origin are analyzed. A hypothesis is proposed to explain the distinctive structure of the water vessel (ambulacral) system of sea cucumbers and the origin of the class Holothuroidea. The development of holothurians was interrupted at the stage of five primary tentacles. It resulted in changing of the mode of… 

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References

SHOWING 1-10 OF 118 REFERENCES

Paedomorphosis and heterochrony in the origin and evolution of the class holothuroidea

The processes of paedomorphosis and heterochrony played an important role not only in the origin and formation of the class Holothuroidea, but also during its evolution of the order Synaptida.

METAMORPHOSIS OF STICHOPUS CALIFORNICUS (ECHINODERMATA: HOLOTHUROIDEA) AND ITS PHYLOGENETIC IMPLICATIONS.

Holothurian metamorphosis for a relatively unspecialized aspidochirote, Stichopus californicus, is described here and assignment of holothurians with echinoids to the subphylum Echinozoa is discussed.

From Vendian to Cambrian: the beginning of morphological disparity of modern metazoan phyla

  • S. Rozhnov
  • Geography
    Russian Journal of Developmental Biology
  • 2010
It is shown that major features of a morphogenetic archetype could be retained from the time the taxon was formed, and probably, an expanded placozoan level of organization can be assumed for most Vendian animals.

NEPHRIDIA IN THE LARVAE OF HEMICHORDATES AND ECHINODERMS

Although invertebrate deuterostomes are believed to lack discrete excretory organs, an analysis of the metamorphosis of the larval nephridia suggests that adult echi...

Bi-penta-bi-decaradial symmetry: A review of evolutionary and developmental trends in holothuroidea (echinodermata)

  • KerrKim
  • Biology
    The Journal of experimental zoology
  • 1999
Holothuroidea, comprising the sea cucumbers, is the least studied class of extant echinoderms, yet this group possesses a wealth of features of potential interest to developmental and evolutionary biologists, and the morphological and molecular evidence suggests almost an inversion of the prevailing higher level classification.

Origin of the holothurians (Echinodermata) derived by constructional morphology

The present approach, which follows the principles of constructional morphology, supports former views that the holothurian predecessor must have been echinoid-like, and confirms the existence of respiratory trees by no later than the Middle Devonian.

System of the class Holothuroidea

Various interpretations of the holothurian system and phylogeny are critically reviewed and the main characters that form the basis of the existing systematics of this group are analyzed. A system of

The anteroposterior axis in echinoderms and displacement of the mouth in their phylogeny and ontogeny

Dislocation of Hox-genes in sea urchins is explained by the necessity to preserve the spatial and temporal colinearity in the course of the convergence of the starting and final stages of the mouth displacement process, similar to the elevation process in crinoids.

Deuterostomes in a twist: the origins of a radical new body plan

  • A. Smith
  • Biology
    Evolution & development
  • 2008
Comparing echinoderm ontogeny and genetic developmental signalling patterns with those of their sister group, the hemichordates, suggests that an evolutionary switch from posterior facultative to anterior obligate larval attachment proved the critical trigger for this transformation.

A “rays-as-appendages” model for the origin of pentamerism in echinoderms

A new hypothesis concerning the evolutionary origin of pentameral symmetry in echinoderms is presented and it is proposed that a duplication of the uniray occurred and resulted in the addition of a pair of rays that followed Bateson's rules of symmetry to form a three-rayed 0-1-2, —A-BA, construction.
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