Diact(in(e))

Definition

In C., D., H., Ho.; any spicule with two diverging rays; d. may be monaxonic (e.g., oxeas, strongyles, diods) or be reduced forms of calthrops, triods, tetraxons or hexacts; in C. spicule similar to oxeas of D. but with two actines (at least the initial growth is bidirectional); the tips in d. can be identical or not.

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