External characters
massive, spreading over substrate; specimen comprised of thick, conjoined, convoluted sections.
Colour
white in life; white in ethanol.
Skeletal Characters
| Oscules | numerous, regularly spaced across surface, appear slightly raised and lipped; flush with surface in ethanol. |
| Texture | hard, brittle, easily broken. |
| Surface_Ornamentation | thick, dense, confused crust of megascleres. |
| Ectosomal_Skeleton | irregular brushes of oxeas, almost in 3-dimensional reticulation. |
| Choanosomal_Skeleton | smaller strongyloxeas, with larger spicules sparsely re-enforcing mulitspicular tracts; multispicular primary tracts run perpendicular to ectosome at regular intervals; secondary tracts multispicular, irregular; loose spicules scattered throughout. |
| Megascleres | strongyloxeas: 2 size classes. |
| Microscleres | nil. |
| Mudmap_Author | P Sutcliffe |
| Mudmap_Editor | Kathryn Hall |
Distribution
In French Polynesia: Marquesas islands
Ecology and habitat
In caves
P Sutcliffe (2014). QM4710 Petrosia (Petrosia) sp. (OTU QM4710) . In: Hall, K.A. & Hooper, J.N.A. (2014) SpongeMaps: an online community for taxonomy and identification of sponges. (Available at http://www.spongemaps.org).
