Structure and affinities of Hormiphora
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The tentacles bear numerous lateral branches containing adhesive cells and
b. Are completely retractile into deep sheaths.
iii. Mouth, a slit-like opening present at the narrow oral end.
iv. Eight ad-radially arranged, equidistant meridional bands, the comb-ribs or costae or swimming plates, starting from near the aboral pole and extending about two-thirds of the distance towards the oral pole are present on the surface. These help in swimming.
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