  Simulating marine sponge growth helps marine biologists analyze, measure, and
predict the effects that the marine environment has on marine sponges, and vice
versa. This paper describes a way to simulate and grow geometric models of the
marine sponge Crella incrustans while considering environmental factors
including fluid flow and nutrients. The simulation improves upon prior work by
changing the skeletal architecture of the sponge in the growth model to better
suit the structure of Crella incrustans. The change in skeletal architecture
and other simulation parameters are then evaluated qualitatively against photos
of a real-life Crella incrustans sponge. The results support the hypothesis
that changing the skeletal architecture from radiate accretive to Halichondrid
produces a sponge model which is closer in resemblance to Crella incrustans
than the prior work.
