FIGURE 2 in The taxonomic position of the pelagic 'staurozoan' Tessera gemmaria as a ceriantharian larva

FIGURE 2. Histological preparations: a—Detail of the gastrovascular cavity with four mesenteries. b—Detail of the gastrovascular cavity with 8 mesenteries and folded mesenterial filaments. c—Detail of actinopharynx and two mesenteries being formed. d—Detail of hollow tentacles and the tentacle tip with a button of cnidocysts. e—Spirocyst in the aboral pore. f—Detail of acontioids. ac—acontioids, bc—terminal buttons of cnidocysts, m—mesenteries, mf—mesenterial filaments, ph—actinopharynx, si—siphonoglyph, sp— spirocyst, t—tentacles, vc—vacuolated cells. Scale bar a-d = 0.05 mm, e = 10 µm, f = 20 µm.