Staurocalyptus

Staurocalyptus is a genus of sponge. It was circumscribed in 1897 by Isao Ijima.

Taxonomy
Ijima circumscribed Staurocalyptus as a genus in the family Rossellidae. His initial taxonomy included three newly described species and two transferred from Rhabdocalyptus. Ijimi did not designate a type species; in 1967 V. M. Koltun designated Rhabdocalyptus dowlingi Lambe, 1893 as the type species. A 2002 revision of Rossellidae by K. R. Tabachnick demoted Staurocalyptus to be a subgenus of Acanthascus and designated a new type species: Staurocalyptus glaber Ijima, 1897. However,, WoRMS still classifies Staurocalyptus as a genus and follows Koltun's type species designation, not that of Tabachnick.

Distribution
Its species are found in the Pacific Ocean, at a depth of 30 –.

Species
, WoRMS recognizes the following seventeen species:
 * Staurocalyptus affinis Ijima, 1904
 * Staurocalyptus celebesianus IIjima, 1927
 * Staurocalyptus dowlingi (Lambe, 1893) Ijima, 1897
 * Staurocalyptus entacanthus Ijima, 1904
 * Staurocalyptus fasciculatus Schulze, 1899
 * Staurocalyptus fuca Tabachnick, 1989
 * Staurocalyptus glaber Ijima, 1897
 * Staurocalyptus hamatus Lendenfeld, 1915
 * Staurocalyptus heteractinus Ijima, 1897
 * Staurocalyptus microchetus Ijima, 1898
 * Staurocalyptus pleorhaphides Ijima, 1897
 * Staurocalyptus psilosus Reiswig & Stone, 2013
 * Staurocalyptus roeperi (Schulze, 1886) Ijima, 1897
 * Staurocalyptus rugocruciatus Okada, 1932
 * Staurocalyptus solidus Schulze, 1899
 * Staurocalyptus tubulosus Ijima, 1904
 * Staurocalyptus tylotus Reiswig & Stone, 2013