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vol.73 issue4The sequence of origin of the postmetamorphic rays in Heliaster and Labidiaster (Echinodermata: Asteroidea)Disjoint geographical distribution of intertidal and nearshore benthic invertebrates in the Southern Hemisphere author indexsubject indexarticles search
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Revista chilena de historia natural

Print version ISSN 0716-078X

Abstract

HOTCHKISS, FREDERICK H C. Inferring the developmental basis of the sea star abnormality "double ambulacral groove" (Echinodermata: Asteroidea). Rev. chil. hist. nat. [online]. 2000, vol.73, n.4, pp.579-583. ISSN 0716-078X.  http://dx.doi.org/10.4067/S0716-078X2000000400003.

Very rarely a ray of a sea star is unusually wide and has two parallel ambulacral grooves that extend to a single tip. Such a ray has two terminal plates that are coalesced laterally. This abnormality is inferred to develop as a rare result of regeneration because it is recorded from a species with obligate asexual reproduction (fission and regeneration of halves; no gametes). This conclusion is supported also by an example where the abnormality affects only the distal third of a ray

Keywords : Echinodermata; Asteroidea; regeneration; teratology; symmetry.

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