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(Popofsky, 1904)

Four main 4-winged spicules longer than 16 secondary conical. One pair of main slightly longer than other and faintly keeled. All spicule tips pointed, bases with small pyramids fused into central spherule. Length of larger main spicules: 0.07-0.1 mm, width: 0.004-0.006 mm; length of smaller main spicules: 0.05-0.06 mm, width: 0.003-0.005 mm; length of secondary spicules: 0.03-0.05 mm, width: 0.002-0.004 mm.

Tetralonche rara