Hooge MD & Tyler S, 2005 (citation): Bursa with a sclerotized bursal nozzle. Common male and female gonopore, positioned ventrally. Opening to male copulatory organ positioned posteriorly to opening to seminal bursa. Male copulatory organ consists of a muscular, often glandular, tubular penis, always unciliated, surrounded by a muscular seminal vesicle. Stimulatory organs sometimes present. Insunk brain. Lateral edges often slightly enrolled. Usually with algal symbionts. Usually with pigmented ocelli.[From Hooge MD, Tyler S (2005)]
Notes from synonyms
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