Müller, 1855
Thin spicules equal or subequal, all of same shape. Cell body polygonal.
Eight species:
Acanthometra annulata
Acanthometra bulbosa
Acanthometra cylindrica
Acanthometra dolichoscia
Acanthometra fusca
Acanthometra pellucida
Acanthometra prismatica
Acanthometra tetracopa
Remark
The species Acanthometra annulata was erected by Popofsky in 1906 (as Zygacantha annulata Popofsky, 1906) from 2 poorly preserved specimens, based on the presence of "rings" on the spicules. This species has not been recorded since, and such unusual structures on the spicules, absent in all other acantharians, suggest that the spines in question do not belong to Acantharia (sponge spicules?).