The basal disc is concave, and able to stick firmly to the substrate.
2.
Gland cells in the basal disc secrete a sticky fluid that accounts for its adhesive properties.
3.
The basal disc is grooved ( from gill impressions ) and pruinose or covered with fine minute hairs, but soon becomes smooth.
4.
"Hydra " has a tubular, radially symmetric body up to long when extended, secured by a simple adhesive foot called the basal disc.
5.
This means one has the basal disc ( bottom ) and the other has the oral disc ( top ); the new polyps must separately generate the missing pieces.
6.
It is attached to the rock or other algae by a small basal disc and is much branched with downgrowing filaments which enclose the main branch or axis forming a cortex.
7.
In this process, part of the basal disc of the sea anemone gets detached as the anemone moves over the substrate, and this piece is able to grow into a new individual.
8.
Above this lies the limbus ( the junction between the basal disc and the column ), and just above that are the relatively prominent cinclides ( specialised pores ), each on a small mound.
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