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Haeckel

Diagnosis: Spheroidal to ellipsoidal shell with triangular (sometimes square) mesh openings. Radial tubes generally smooth, about as long as tangential bars, with 2-4 (rarely 3, seldom 4) straight or slightly curved terminal branches, third to fifth as long as radial tubes.

Diameter: 1.2-4.0 mm.

Aulosphaera triodon