Haeckel, 1887
Shell thin-walled. Spicules cylindrical, slightly compressed or lance-shaped. Two small round or elliptical aspinal pores, 4-12 small (2-4 times smaller than aspinal) circular coronal pores, surrounded by 5-6 bi-lobed or irregular sutural pores of variable size. Shell diameter: 0.3 mm; length of main spicules: 0.12-0.15 mm.