Color through pigments or symbiotic algae; statocyst may be absent; brain insunk; frontal gland weak; mouth ventral; rhabdoids may be absent; posterior as a rule with pronounced posterior lappets; ovaries and testes paired; two genital openings or they may be manifold; seminal bursa with two or more curved or corkscrew-shaped sclerotised bursal canals; copulatory organ complex, conical, pyramidal or tubular; a male antrum and a seminal vesicle may be absent.[From Winsor L (1990): 795]
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