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Haeckel, 1887

Main spicules of differing length and shape, cylindrical in distal part, four-flanged in proximal portion with two broad flanges lying in equatorial plane; posterior spicule two times as long and two to four times as wide as anterior spicule; 18 shorter remaining spicules pin-like. Central capsule green, semitransparent. Length of anterior spicule: 0.1 to 0.2 mm, breadth: 0.02 to 0.03 mm; length of posterior spicule: 0.2 to 0.4 mm, breadth: 0.04 to 0.08 mm; length of 18 smaller spicules: 0.05 to 0.15 mm.

Amphibelone cultellata