Summary
Rhabdopleura has an overwintering stage that consists of two layers of cells surrounding a central yolk mass. This cellular part is surrounded by a thick electron dense capsule which is secreted by the bud itself. The capsule is probably impervious and protective to its contents.
Blood vessels join the buds to the zooids of the colony. They form the probable route of transfer of yolk from the zooids to the dormant bud.
The capsule of the dormant bud has some structural features in common with the black stolon of the adult zooids. The black stolon is probably formed in a manner similar to that which made the fusellar fabric of the periderm of fossil graptolities.
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I wish to thank Professor J. Z. Young FRS for continued advice and encouragement throughout my studies. Drs. Eve Southwood and A.R.D. Stebbing together with the staff of the Marine Biological Association's Laboratory at Plymouth gave freely of their time and expertise in obtaining the specimens for me. Mr. R. Moss and Miss D. Bailey gave much technical and photographic assistance. Miss P. Stephens skillfully produced the histological preparations.
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Dilly, P.N. The dormant buds of Rhabdopleura compacta (Hemichordata). Cell Tissue Res. 159, 387–397 (1975). https://doi.org/10.1007/BF00221785
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DOI: https://doi.org/10.1007/BF00221785