Drawing

Description:

Distephanus speculum octonarius (Ehrenberg, 1844) Joergensen The skeleton is composed of an octagonal basal ring with eight radial spines projecting from the outer surface of the angles. A smaller apical ring, also octagonal, is held out from one side of the skeleton by eight supporting bars. A small protuberances is present mid-way along each of the eight sides of the apical ring.