METAMORPHOSIS OF CALCAREOUS SPONGES .1. ULTRASTRUCTURE OF FREE-SWIMMING LARVAE
METAMORPHOSIS OF CALCAREOUS SPONGES .1. ULTRASTRUCTURE OF FREE-SWIMMING LARVAE
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DOI：
10.1080/07924259.1992.9672223
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发表时间：
1992-06-01
影响因子：
0.8
通讯作者：
HORI, I
中科院分区：
文献类型：
--
作者：
AMANO, S;HORI, I
用电子显微镜研究了两种钙质海绵的自由游动幼虫。幼虫由四种细胞组成，即鞭毛细胞、颗粒细胞、四个十字形细胞和几个含卵黄细胞。在幼虫的前半球，柱状鞭毛细胞排列成单层。它们的细胞核和高尔基体位于鞭毛根附近。幼虫后半球有颗粒细胞。它们有一个带核仁的核，大的吞噬体，发达的高尔基体和许多粗面内质网池。幼虫的每个象限都有一个十字形细胞。从十字形细胞特有的细胞器排列来看，它可能参与光感受，但不能就此得出结论。含卵黄细胞很可能是来源于母体海绵的营养细胞。并讨论了这四种细胞在生境选择和变态中的作用。
Free-swimming larvae of two calcareous sponges were studied by electron microscopy. The larvae are composed of four kinds of cells, namely flagellated cells, granular cells, four cruciform cells, and several yolk-containing cells. In the anterior hemisphere of the larvae, the columnar flagellated cells are arranged in a single layer. Their nucleus and Golgi apparatus are located in close proximity to the flagellar rootlets. There are granular cells in the posterior hemisphere of the larvae. They have a nucleus with a nucleolus, large phagosomes, well-developed Golgi apparatus, and numerous RER cisternae. There is a cruciform cell in each quadrant of the larvae. From its characteristic arrangement of organelles, it is suggested but not concluded that the cruciform cells participate in photoreception. The yolk-containing cells are, most probably, nutritive cells derived from the mother sponge. The roles of these four kinds of cells in habitat selection and metamorphosis are discussed.