ISSN:
1573-5117
Keywords:
Cnidaria
;
Cassiopea
;
reproduction
;
budding
;
cell recruitment
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Cassiopea andromeda scyphistomae reproduce asexually by forming spindle shaped buds which, after detachment, metamorphose into polyps. Parent polyps appear to contribute to the buds' ecto- and endodermal epithelial cells, septal muscle cells, nematocytes and some zooxanthellae. Herein we describe bud morphogenesis, define 5 bud stages, and investigate the recruitment of bud ectoderm. India ink vital marking experiments reveal permanent apicobasal displacement of ectoderm. Labelled polyp cells are displaced towards and incorporated into the emerging bud. Ectoderm is recruited from all angular positions and cells labelled at increasing distances from the bud center are traced at increasingly more proximal positions on the buds. Unlike in Hydra attenuata, the recruitment area appears to be asymmetric since the zone contributing ectoderm from below is smaller than the zones above and lateral to the buds.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00026443
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