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Revista Brasileira de Zoologia

Print version ISSN 0101-8175

Rev. Bras. Zool. vol.10 no.2 Curitiba  1993

http://dx.doi.org/10.1590/S0101-81751993000200013 

Microanatomia e histologia do sistema digestivo de Phyllocaulis soleiformis (Orbigny) (Mollusca, Gastropoda, Veronicellidae). V. Glândula digestiva

 

Microanatomy and histology of the digestive system of Phyllocaulis soleiformis (Orbigny, 1835) (Mollusca, Gastropoda, Veronicellidae). V. Digestive gland

 

 

Ana Maria Leal-ZanchetI; José Willibaldo ThoméII; Josef HauserIII

IInstituto de Pesquisas de Planárias, Universidade Vale do Rio dos Sinos, Caixa Postal 275, 93001-970 São Leopoldo, Rio Grande do Sul, Brasil
IIInstituto de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul, Av. Ipiranga, 6681, 90619-900 Porto Alegre, Rio Grande do Sul, Brasil
IIIMuseu de Zoologia, Universidade Vale do Rio dos Sinos, Caixa Postal 275, 93001-970 São Leopoldo, Rio Grande do Sul, Brasil

 

 


ABSTRACT

The digestive gland of Phyllocaulis soleiformis is a compound tubular gland. The secretory tubules are made up of two main cell types: the digestive cells and calcic cells. The digestive cells are the most numerous, usually columnar, and exhibit three different functional stages: absorptive, secretory and excretory. These cells contain two cytoplasmic granules types and, in the excretory stage, most of the cell is occupied by a large vacuole. The calcic cells occursingly or frequently in groups of two or three, are triangular shaped and have distinct apical granules, and yet calcic histochemical detected granules. In addition, there is a third cell type, without characteristic cytoplasmic granules and which correspond to the undifferentiated cells. The excretory duets system are represented by anterior and posterior vestibules, which branche to form the duets, that communicate with the secretory tubules. These excretory duets are lined with a simple epithelium of ciliated columnar cells, followed by a layer of connective tissue with circular and longitudinal muscular fibers. Subepithelial mucous cells are present only in the vestibules.

Key words: Mollusca, Gastropoda, Veronicellidae, Phyllocaulis soleiformis


 

 

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Recebido em 30.I.1991; aceito em 25.XI.1993.