Fig. 7

Muscular details of the walkerioidean Triticella flava. a General overview of the myoanatomy of a single zooid. Note the thin stalk that attaches the zooid to the small attachment disc. Volume rendering. b Detail of attachment sites of a colony. Note the strong autofluorescence of the dome-shaped cuticle and small portions of basal muscles inside. Volume rendering. c Detail of the parietal muscle, which is restricted to one side of the zooid. Note also the striated retractor muscles. Volume rendering. d Detail of the attachment area of a colony showing two stalks attached to the highly autofluorescent cuticle of the attachment area. Note the short basal stolonal muscles in the attachment area. Maximum intensity projection. Abbreviations: a – aperture, at – attachment area, dg – digestive tract, l – lophophore, pc – pore complex, pm – parietal muscle, rm – retractor muscle, sm – stolonal transverse muscle, st – stalk