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(a) Dorsal view. Scale bar, 1 cm. (b) Right half in ventral view. Red arrow indicates the costovertebral articulation. (c) Cleared and double-stained juvenile specimen. Scale bar, 5 mm. (d) Enlarged image of the immature costal plates in c. Box in c indicates the position of d. Scale bar, 2 mm. cos, costal plate; T1–T9, thoracic vertebra numbers; neu, neural plate; nu, nuchal.
