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Tunicate_Oikopleura gracilis with house 6-3-16-67 bst_this.jpg

Fritillariidae Lohmann, 1915 , A class of marine planktonic animals in the subphylum Tunicata. The class Appendicularia (alternatively known as Larvacea)  is a species of small pelagic tunicate found in the surface waters of most of the world's oceans. It is used as a model organism in research into developmental biology.Oikopleura dioica is the only species of appendicularian to have separate sexes; others are hermaphrodites. They secrete mucus filtering structures called houses.the house does not completely surround the body in Fritillaria,  Phylum‎: ‎Chordata, Class‎: ‎Appendicularia<br />
Oikopleura gracilis, Oikopleura; Lohmann, 1896	Family‎: ‎Oikopleurida ID from Wyatt Patry. Over 600' depthFinal ID by  Ludwig Gasiorowski-Copenhagen.