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Comparative fine structural studies of planulae and primary polyps of identical age of the sea pen, Ptilosarcus gurneyl
Author(s) -
Chia FuShiang,
Crawford Bruce
Publication year - 1977
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1051510108
Subject(s) - biology , metamorphosis , cell type , cell , anatomy , interstitial cell , ultrastructure , pathology , ecology , endocrinology , larva , genetics , medicine
Abstract Electron microscopic study of an 18‐day‐old planulae and primary polyps of the sea pen, Ptilosarcus gurneyi , reveals 14 cell types: sustentacular cell A, sustentacular cell B, nerve cell, sensory cell, cnidoblast, interstitial cell, five types of gland cell (A, B, C, D and E), amoebocyte, style cell and endodermal cell. Of these, 9 are found in the planula, 12 in polyps and 7 are common to both stages. The fine structure of all cell types is described. Since the planulae and polyps in this study were identical in age of development, the gaining and losing of certain types of cells in the polyp are attributed to changes associated with settlement and metamorphosis. Modifications of the seven common cell types during metamorphosis can also be attributed to the change of life style from pelagic to benthic.