Tunicata Lamarck, 1816 - tunicates see Subphylum Urochordata Bateson, 1885 Thaliacea van der Haeven, 1850 - salps Order Pyrosomatida Jones, 1848 Family Pyrosomatidae Lahille, 1888 Genus Pyrostremma Garstang, 1929 1 Pyrostremma spinosum (Herdman, 1888) 2 Pyrostremma agassizi (Ritter & Byxbee, 1905)