Trunk up to 1.5 mm long, flattened, with 2 triangular appendices on its genital end (Fritillaria venusta). Digestive tract axis longitudinal. Testis trapezoidal, laterally surrounded by a cord-shaped ovary. Tail musculature narrow. Amphichordal cells inconspicuous, flat, and elongate.
Kingdom Animalia Phylum Chordata Subphylum Urochordata Class Appendicularia Family Fritillaridae Subfamily Fritillarinae Genus Fritillaria Subgenus Eurycercus Species Fritillaria venusta