Myrmeciophytum verrucosum
Roemer 1864
Myrmeciophytum verrucosum is a rare species, only known as cylindrical fragments. The sponge is characterized by conspicuous star-like grooves around the postica.
The skeleton consists of large smooth tetraclones.
Myrmeciophytum verrucosum could be confused with Astrocladia subramosa, but the latter has smaller "stars" and the skeletal tetraclones are smaller, more irregular and strongly branched.
Another, very similar specimen of Myrmeciophytum verrucosum.