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(Haeckel, 1887)

Anterior main spicule usually 1.5 to 2.5 times shorter than posterior, tips pointed. Secondary spicules 5-8 and up to 20 times shorter than main, cylindrical (very rarely main spicules as short as secondary ones). Cell body cylindrical. Length of main spicules, anterior: 0.6-0.8 mm, posterior: 1.2-1.6 mm; secondary spicules: 0.08-0.3 mm.

Amphilithium concretum