Abstract
The sarcoplasmic reticulum (SR) in caudal muscle cells of the larva of the polycitorid ascidian Distaplia occidentalis consists of perifibrillar cisternae and coextensive cisternal aggregates. The multilaminar aggregates resemble the interdigitated collars of perifibrillar SR which embrace the sarcomeric H-bands of the cross-striated myofibrils. Cisternae of the coextensive sarcoplasmic reticulum neither envelop the contractile myofilaments nor couple to the sarcolemma. Ultra-structural evidence is suggestive that the coextensive multilaminar aggregates are transient elements of the sarcoplasmic reticulum.
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