(Haeckel, 1860)Spicules cylindrical, pin-like, tips sharp, each with 16 myonemes. Ectoplasm much thicker than endoplasm; ectoplasmic cortex two-layered. Diameter of cell body: 0.3 mm; spicule length: 0.6-0.8 mm; diameter of central spherule: 0.012-0.015 mm.
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