Fig. 10

Tentacle sheath musculature in walkerioidean and victorelloidean ctenostomes showing a diagonal arrangement of muscle fibres. a Distal tip of the tentacle sheath of Aeverillia setigera. Note the pore complex separating the spinozooid. Volume rendering. b Lophophoral base of Victorella pavida. Maximum intensity projection. c Protruded lophophoral base of Triticella flava. Volume rendering. Abbreviations: al – abfrontal lophophoral base muscle, fl – frontal lophophoral base muscle, lb – lophophoral base, pc – pore complex, pm – parietal muscles, rm – retractor muscle, sz – spinzooid, tm – tentacle muscle, tsm – tentacle sheath muscles, vm – ‘v’shaped lophophoral base muscles