The topology of the heart and the pericardium of the chiton Stenosemus albus (Linnaeus, 1767) (Mollusca: Polyplacophora) is described as a result of the study of the general morphology and ultrastructure of the cardiac complex. Application of 3D-reconstruction technology to a series of histological sections detected three invaginations of the pericardium of S. albus. The dorsal invagination forms the ventricle, while two lateral invaginations form auricule walls. The auricular cavities are surrounded by the basement membrane of the pericardium from the inner side and by connective tissue from the outside. The investigation of the ultrastructure of the cardiac complex showed that the zones of ultrafiltration in S. albus are located both in the pericardium, as in all other chitons described earlier, and in the ventricle as well, as we describe here for the first time.
Russian Journal of Marine Biology – Springer Journals
Published: Sep 1, 2015
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