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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