Iotrochotidae Dendy (Demospongiae, Poecilosclerida) is revived in Myxillina with the distinguishing feature being possession of birotula microscleres. Resemblance of birotulas to polydentate chelae of some Myxillidae make it likely that birotulas are derived from anchorate chelae by proliferation of the alae. This is supported by the occurrence of true anchorate isochelae in a few members of the family. From these facts a close relationship between Myxillidae and Iotrochotidae may be concluded. The shape, skeletal architecture and further spicule complement in this family is quite diverse, paralleling that of the larger families of Myxillina. Six genera are considered valid.
KeywordsPorifera Demospongiae Poecilosclerida Myxillina Iotrochotidae Amphiastrella Hymetrochota lotroata lotrochopsamma lotrochota Rotuloplocamia
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