Haeckel, 1887
Shell thick-walled, dimpled, with network of crests, of same construction as A. hastata, with 170-190 dimples (20 aspinal, 100-110 coronal, and 50-60 sutural). All dimples and pores nearly of same size. Each node of crested network bears stout spine, forked at base, with two divergent straight branches. Radial main spicules two-edged, sword-like, nearly as long as diameter of shell. Diameter of shell: 0.13 mm, of pores: 0.008 mm.