Gemmulation asexual reproduction fission. This makes T. In this type the plane of fission is parallel to the long axis, as in Euglena, Vorticella and in some corals Fig. They were distinguished on the basis of their differing x-ray absorption characteristics Fig. Some sea anemones and some coral polyps also reproduce through fission. Since two parents of opposite sexes are needed i. However, pinacoderm eversions also play a role in budding dominated by mesenchymal morphogenesis, at least in the very first phase of bud formation. Methodology A number of morphological methods are available for studying temporal morphological developmental series. In contrast, the earlier stage 4a displays lower biomass and less prominent megasclere bundles Fig.