Mostly small turbellarians with pharynx bulbosus and simple saccate gut (occasionally absent), parenchyma fairly open; Protonephridia paired when present; With anterior brain and ventral nerve trunks (usually one main pair) with cross connections, without statocyst; Gonads with a tunica and mostly with ducts; testes usually compact, eggs ectolecithal, ovaries separate or sometimes joined to vitellaria (ovo-vitellaria): sexually reproducing, often with a uterus; Mainly aquatic, some terrestrial, many symbiotic;
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