A salp (plural salps) or salpa (plural salpae or salpas) is a barrel-shaped, planktic tunicate. Didemnum vexillum is a species of colonial tunicate in the family Didemnidae. Styela clava is a solitary, subtidal ascidian tunicate. A tunicate is a marine invertebrate animal, a member of the subphylum Tunicata. "Zephyranthes carinata" grows from tunicate globular bulbs in diameter. "S. clava" is a solitary tunicate. Species in the genera "Allium", "Hippeastrum", "Narcissus", and "Tulipa" all have tunicate bulbs. Like a common tunicate larva, the adult appendicularian form has a discrete trunk and tail. Other tunicate species produce distasteful organic compounds as chemical defenses against predators. "Pyura chilensis" is a tunicate that somewhat resembles a mass of organs inside a rock. Pyura chilensis, called piure in Spanish, is a tunicate of the family Pyuridae. Ascidia mentula is a species of solitary tunicate. It is commonly called sea vomit, marine vomit, pancake batter tunicate, or carpet sea squirt. Didemnum molle is a species of colonial tunicate in the family Didemnidae. "Botryllus schlosseri", a colonial tunicate, is a protogynous hermaphrodite.