Porifera note details

Poecilosclerida with terminally spined ectosomal monactinal megascleres (occasionally modified to quasidiactinal forms); choanosomal megascleres diverse, consisting of at least two categories localized to distinct regions within the skeleton, or sometimes up to five categories including spicules echinating fibres in many taxa; isochelae of palmate origin, with diverse forms of toxas but lacking sigmas.
Hooper, J.N.A. 2002. Suborder Microcionina Hajdu, Van Soest & Hooper, 1994. Pp. 409-411. In Hooper, J. N. A. & Van Soest, R. W. M. (ed.) Systema Porifera. Guide to the classification of sponges. 1 (Kluwer Academic/ Plenum Publishers: New York, Boston, Dordrecht, London, Moscow).