Question

give an account on development sponges

Answer 1

Although phylogenetically crucial, demosponges largely have been overlooked for developmental studies because their adult body plan is simple and appears to have little in common with the rest of the Metazoa (Brusca and Brusca, 2003). There also has been an historical confusion regarding embryogenesis and gastrulation in sponges, in part due to the diversity of external characteristics of different sponge embryos and larvae (Leys and Degnan, 2002; Leys, 2004; Maldonado, 2004). Adult sponges do not have any obvious body axes and appear to lack tissue-level organization, although recent reassessment of these characters suggest they do possess rudimentary axes and tissue organization