This study treats three genera of West-Indian shallow water Tethyidae (Porifera Demospongiae). The poorly known genus Columnitis Schmidt 1870 has been redescribed by re-examination of its type species C. squamata and the description of a new species C. anomala.
This genus is characterized by a skeleton made from parallel bundles of subtylostyles crossed in the inner part by a layer of thinner subtylostyles and by three kinds of asters. A new genus, Nucleotethya, and a new species, N. bifida have been erected to harbor specimens bearing
a large spicular core. The knowledge of the genus Tectitethya Sarà 1994 has been increased by the description of three new species, T. keyensis, T. macrostella and T. raphyroides.
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