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vol.73 issue4Inferring the developmental basis of the sea star abnormality "double ambulacral groove" (Echinodermata: Asteroidea) author indexsubject indexarticles search
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Revista chilena de historia natural

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SANCHEZ R, PATRICIO. The sequence of origin of the postmetamorphic rays in Heliaster and Labidiaster (Echinodermata: Asteroidea). Rev. chil. hist. nat. [online]. 2000, vol.73, n.4, pp.573-578. ISSN 0716-078X.

Postmetamorphic rays in Heliaster and Labidiaster originate in four `quadrants' between the five primary rays, and not normally in the madreporic interradius. The rays originate in one of two very definite sequences depending on the species. H. kubiniji and H. multiradiatus share one sequence, whereas H. canopus, H. helianthus and Labidiaster share the other sequence. Pycnopodia, Rathbunaster, Heliaster and Labidiaster add rays at far greater sizes and in a manner that is distinctive from other multiradiate starfish, possibly indicating a new taxonomic unit

Keywords : Echinodermata; development; symmetry; Heliaster; Labidiaster.

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