without paratomy; without cilated pits or furrows; without refractile bodies; brain with 2 posterior and 2-5 anterior gangliar lobes; mixed gonads elongated, usually hourglass-shaped, most in male condition; sometimes posterior part of gonad develops into an ovary; sperm nucleus usually of very distinctive shape (conglomerate, rod-, ribbon-, spicule-, banana-shaped); paired granular strands of parenchymous nature usually present between gut and skin; generally with statocyst with 4 nuclei in ventral wall; marine.
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