Amphilithium clavarium

(Haeckel, 1887)

Main posterior spicule 0.5-1.5 times longer than anterior. Main spicules proximally 4-bladed or 4-winged in cross section. Secondary spicules 2.5 times shorter than main, thread-like, flexible. Length of main spicules, anterior: 0.4 mm, posterior: 0.7 mm; secondary spicules: 0.3 mm.