Hooge MD & Tyler S, 2005 (citation): Bursa with sclerotized bursal nozzle. Separate male and female gonopores, positioned ventrally; male gonopore positioned posterior to female. Male copulatory organ consisting of a tubular, muscular penis that is often glandular and may have inner ciliation. Penis invaginated into a muscular seminal vesicle. Gonopores and mouth opening with or without prostatoid (stimulatory) organs. Insunk brain. Frontal organ usually present. Lateral edges usually enrolled. Usually with algal symbionts. Often with pigmented ocelli.[From Hooge MD, Tyler S (2005)]
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