Entocolax, mouth at free extremity, animal fixed by aboral orifice of pseudopallium, Pacific. Entoconcha, body elongated and tubular, animal fixed by the oral extremity, protandric hermaphrodite, parasitic in testes of Holothurians causing their abortion.
The Myzostomida are protandric hermaphrodites, being functional males when small, nermaphrodite later, and finally functional females (Wheeler).
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