Centroheliozoa with a periplast with tangential plate-scales and external radial spicules. The radial spicules have a cylindrical shaft attached to the central part of a radially symmetric base-plate. Fourteen species, mostly freshwater, the type species A. turfacea Carter, 1863 has been recorded in marine, brackish and fresh waters.

Depth range based on 1 specimen in 1 taxon.

Environmental ranges
  Depth range (m): 0.75 - 0.75
 
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