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image of Journal of Crustacean Biology

ABSTRACT The heart wall of Anaspides tasmaniae consists of a single-layered epicardium and a single-layered myocardium. The myocardial ultrastructure is advanced. The cardiac sarcomere has a full set of bands, and an M-line is present. The sarcolemma invaginates, mainly at Z-band levels, to form clefts and T-tubules. The abluminal Tz,-tubules penetrate deeply and are partly filled by epicardial processes. These reach far into the tubules and form desmosomes with the sarcolemma at Z-band levels. Longitudinal T-tubules combine with the sarcoplasmic reticulum to form interior couplings at H-band levels. Peripheral couplings are often found at this band level. Contractile elements are absent from the anterior and the posterior aorta and from the lateral arteries.

Affiliations: 1: Cellular Cardiology Research Group, Zoological Laboratory, University of Bergen, Allégt. 41, N-5000 Bergen, Norway.


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