Didemnum Fragile
''Didemnum fragile'' is a species of Tunicate, sea squirt in the family Didemnidae. Research ''Didemnum fragile'' is of medical interest as it contains shishijimicin molecules, which have been seen to have potent anti-tumor activity in HeLa cells at picomolar concentrations. Shishijimicin A was recently synthesized. References

Aplousobranchia Animals described in 1981 {{tunicata-stub ...
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Tunicate
A tunicate is a marine invertebrate animal, a member of the subphylum Tunicata (). It is part of the Chordata, a phylum which includes all animals with dorsal nerve cords and notochords (including vertebrates). The subphylum was at one time called Urochordata, and the term urochordates is still sometimes used for these animals. They are the only chordates that have lost their myomeric segmentation, with the possible exception of the 'seriation of the gill slits'. Some tunicates live as solitary individuals, but others replicate by budding and become colonies, each unit being known as a zooid. They are marine filter feeders with a water-filled, sac-like body structure and two tubular openings, known as siphons, through which they draw in and expel water. During their respiration and feeding, they take in water through the incurrent (or inhalant) siphon and expel the filtered water through the excurrent (or exhalant) siphon. Most adult tunicates are sessile, immobile and perman ...
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