FIGURE 4. Aplousobranchia, Didemnidae. A–C in The Ascidiacea collected during the 2017 British Columbia Hakai MarineGEO BioBlitz

FIGURE 4. Aplousobranchia, Didemnidae. A–C: Diplosoma listerianum. A: colony on Scyra acutifrons; B, C: close-ups of zooids from two different color morphs. D–F: Trididemnum alexi. D: colony on living scallop; E: same colony closeup with amphipod Polycheria osborni burrowed into tunic surface; F: tunic spicules. Scale bars: A, 1 cm; B, 1.5 mm; C, 1.3 mm; D, 1.6 cm; E, 3.2 mm; F, 35 µm. Photos B and D by G. Paulay.