Turbellarian taxonomic database

Plagiostomidae Acmostomum

with soft sole and ventral glandular pad;
epithelium insunk; thin basement membrane;
brain posterior to the small pharynx variabilis; brain large and its outline clearly visible;
posterior longitudinal nerve in at least 5 pairs;
follicular testes (at least to begin with);
ovary elongate; vitellaria, very late in developing, are posterior;