Figure 4 : Life position on soft-bottom substrates and disc-like burrowing depressions of Deltocyathoides orientalis.

From: Burrowing hard corals occurring on the sea floor since 80 million years ago

Figure 4

(A,B) top views during burrowing. (C,D) oblique and lateral views during burrowing. Note that coralla are buried with their tentacles extended above the substrate.