Doliolaria

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The Doliolaria is a larval form of echinoderms (Echinodermata), which occurs in the individual development (ontogenesis) of the hair stars and the sea whale (Holothuroida). It is a bilaterally symmetrical shape that can be derived from the Dipleurula .

The Doliolaria of the Pelmatozoa, also known as Vitellaria because of the large amount of yolk , is initially equipped with a simple eyelash band, which breaks up into three to five individual bands. In addition, the larva forms an apical organ with an adhesive group with the help of which the larvae can attach themselves. In this state the metamorphosis begins , in which the Pentacrinus stage is formed, which resembles a sea ​​lily . After a few months, the calyx loosens and a free-living star of hair results.

The doliolaria of the sea caterpillars develops from the auricularia and develops further into a pentactula stage with five tentacles and a pair of feet, from which the finished sea cave develops.

literature

  • A. Goldschmid: Echinodermata, echinoderms. In: W. Westheide, R. Rieger: Special Zoology. Part 1. Protozoa and invertebrates. Spectrum, Heidelberg 2003, ISBN 3-8274-0998-5