ON THE ULTRASTRUCTURE OF THE VENTRICULAR ENDOCARDIUM AND BULBAR ENDOTHELIUM IN 3 TELEOSTEAN SPECIES

  • 1 January 1982
    • journal article
    • research article
    • Vol. 152  (2) , 125-128
Abstract
The endocardium in the ventricle and the endothelium in the bulbus arteriosus are described in 3 phylogenetically distant teleostean species, Betta splendens, Pistella riddlei and Xiphophorus maculatus. The ventricular endocardial cells are attenuated and contain a number of bristle-coated vesicles (BCV). In the former 2 spp. these cells contain numerous ribosomes, a low number of moderately electron-dense bodies (MDB) and a poorly developed agranular endoplasmic reticulum (AER). In X. maculatus these cells are poor in ribosomes but rich in MDB and AER. The bulbar endothelial cells contain high numbers of ribosomes in all species studied, whereas BCV and AER are poorly developed. In P. riddlei these cells have a height of 3-7 .mu.m and are closely packed by MBD; in B. splendens and X. maculatus they appear to be flat and contain a very low number of MDB. These results are compared with findings previously reported for the teleostean ventricular endocardium. The structure differences described may reflect phylogenetic distances.

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