Observations on Growth in Eucidaris Tribuloides (Lamarck), with Special Reference to the Origin of the Oral Primary Spines
Abstract:Observations of 7 specimens of Eucidaris tribuloides maintained in an aquarium during one year, along with study of a large series of preserved specimens, revealed that oral primary spines in this species develop by regeneration, almost always from a break through the proximal portion of the collar of an old ambital primary spine.
Replacement of aboral by oral primaries was found to follow a constant sequence in the living specimens: first in IA 3a or 3b, then in the comparable plate in the same column of IA 2 and 4, then in IA 1 and 5. The same sequence was found in the development of new interambulacral plates aborally and resorption of plates orally. In preserved specimens, this sequence was the most common, although a 3-2, 4-1, 5 sequence was occasionally found. The axis of symmetry is discussed in relation to each sequence.
Information is also given on rates of growth of the corona and growth and regeneration of spines in the species.
Document Type: Research Article
Publication date: December 1, 1965
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