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Diagnosis: External lattice ovate in lateral view. Valves typically with ten styles, extending beyond external lattice, distal ends tapering and branching dichotomously 3 (rarely 4) times, producing 8 or 16 terminal branches in a conical tuft. Terminal branches long, slender, generally regularly undulant, with recurved hooks. Spathilla with 3-5 stout, divergent teeth at distal end of each terminal branch.

Length: 1.3-1.5 mm.

Coelodecas pygmaea