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Gill Ultrastructure of the Granular Ark, Tegillarca granosa (Bivalvia: Acridae)  

Ma, Kyung-Hwa (Department of Aqualife Medicine, College of Fisheries and Ocean Science, Yosu National University)
Lee, Jung-Sick (Department of Aqualife Medicine, College of Fisheries and Ocean Science, Yosu National University)
Publication Information
Applied Microscopy / v.33, no.3, 2003 , pp. 223-231 More about this Journal
Abstract
Histology and ultrastructure of the gill in the granular ark, Tegillarca granosa are described using light and transmission electron microscopy. The gill of the clam have typical structure of the filibranch type. The gill filament have several band of lateral and apical cilia. The epithelial layer surrounding the hemolymph sinus is simple and consists of epithelial cells, ciliated cells and secretory cells. The epithelial cells are usually squamous and covered with microvilli. The ciliated cells are usually columnar and can be divided into two types (A and B). Type A cells are more abundance and have lower electron density than B cells. Ultrastructure of the cilia showed that '9+2' microtubular structure of the axial filament and '$2{\times}9$' proximal centriole structure in the cross section. Secretory cells are mainly observed in the apical region of the filament and can be divided into three types of A, B and C with morphological features of the secretory granules. Type A cells of oval shaped are more abundance than other secretory cells and contains numerous secretory granules of low electron dense. Type B cells contains secretory granules of membrane-bounded and high electron dense. Secretory granules of type C cells are elliptical and fine granules surrounding the homogeneous core materials.
Keywords
Gill; Tegillarca granosa; Ultrastructure;
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