Ceractinomorpha

Ceractinomorpha

[sə¦rak·tə·nə′mȯr·fə]
(invertebrate zoology)
A subclass of sponges belonging to the class Demospongiae.
References in periodicals archive ?
The shallow-water (1.5-5 m) species Halisarca dujardini Johnston, 1842 (Ceractinomorpha, Halisarcida) was sampled monthly from December to May and weekly from June to August (1986-1989 and 1991-1994, 1997).
Other species with various levels of distance from the in-group were chosen: these include representatives of other demosponge subclasses - one Ceractinomorpha species (Halichondria panicea) and two Tetractinellida species (Cinachyrella sp.
Latrunculiidae is one of three sponge families that do not possess chelae microscleres, but which Levi (1973) (following Topsent, 1928) assigned to the order Poecilosclerida (subclass Ceractinomorpha).
This is because the mode of embryonic development is a major criterion for distinguishing between the two subclasses Tetractinomorpha and Ceractinomorpha. An additional criterion distinguishing Hadromerida from other sponge orders is the presence of a periflagellar sleeve around the base of the choanocytes' flagella (Vos et al., 1991).