Trunkelongate, up to 1.3 mm long (Fritillaria helenae). Mouth with a double ciliated ring. Five pharyngeal cells adjacent to the oval spiracles. Axis of the alimentary tract oblique. Testis semicircular. Two winding ovaries, irregularly shaped, upon the testis, cord-like.
Kingdom Animalia Phylum Chordata Subphylum Urochordata Class Appendicularia Family Fritillaridae Subfamily Fritillarinae Genus Fritillaria Subgenus Acrocercus Species Fritillaria helenae