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HEART ULTRASTRUCTURE IN DAPHNIA PULEX DE GEER (CRUSTACEA, BRANCHIOPODA, CLADOCERA)

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ABSTRACT The heart of Daphnia pulex lacks epi- and endocardium. The myocardium, covered by a thin basal lamina, is not polarized. In relaxed sarcomeres, Z-, A-, I- and H-bands are present. Invaginations of sarcolemma, forming Tz tubules and clefts, are limited to Z-band levels at both sides of the myocardium. Longitudinal tubules branch off from the Tz tubules. The sarcoplasmic reticulum is regular, with transverse tubules at Z- and A-I-band levels which are interconnected with longitudinally directed tubules. Interior couplings of "tubule-totubule" type are located at Z- and A-band levels and peripheral couplings mostly at A-band level. Intercalated discs are present.

Affiliations: 1: Cellular Cardiology Research Group, Zoological Laboratory, University of Bergen, Allegt. 41, N-5014, Bergen-U, Norway

10.1163/1937240X82X00077
/content/journals/10.1163/1937240x82x00077
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/content/journals/10.1163/1937240x82x00077
2017-12-12

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