Turbellarian taxonomic database
Acoela Polycanthiidae Diagnosis
Hooge MD 2003 (citation) - Male copulatory organ a multi-layered seminal vesicle composed of five layers of
alternating longitudinal and circular muscles: outer-longitudinal muscles, outer-circular muscles,
middle-longitudinal muscles, inner-circular muscles, and inner-longitudinal muscles. Epithelium-lined lumen
of seminal vesicle opens proximally to false seminal vesicle and distally to ciliated male antrum and terminal
male gonopore. Invaginated penis absent.
[From Hooge MD (2003)]
Diagnosis for the valid (accepted) taxonomic name
Diagnosis for Crucimusculata Proporidae
Male copulatory organ posteroterminal, seminal vesicle present. Pharynx, when present located anteriorly. Ovaries never reaching behind testes
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