Trunk up to 0.6 mm long, relatively compact (Fritillaria messanensis). Mouth with upper lip protruding. A large gland cell behind each spiracle. Digestive tract axis transverse. Testis conical to cylindrical, behind one spherical to short-cylindrical ovary. Tail musculature broad.
Kingdom Animalia Phylum Chordata Subphylum Urochordata Class Appendicularia Family Fritillaridae Subfamily Fritillarinae Genus Fritillaria Subgenus Eurycercus Species Fritillaria messanensis