Figure 1.

Head regions of middle- and late-pharyngula embryos of Eptatretus burgeri. (A) Dorsal view of the middle-pharyngula embryo. (B) Lateral view of the late-pharyngula embryo. The levels of the sections used in the histological analysis and in situ hybridization are shown by arrows (otic level) and arrowheads (pre-otic levels). Abbreviations: aud, auditory capsule; c. br, branchial cartilage; c. bas, basal cartilage; d. l. b, dorsal longitudinal bar; d. pl, dental plate; ex. pq, extrapalato-quadrate; fb, forebrain; hb, hindbrain; lab. c, labial cartilage; m. cl, clavatus muscle; mb, midbrain; nt, notochord; oc, eye; ot, otic vesicles; pal. b, paraline bar; pch, prechordal plate; pq, palato-quadrate; t. cl, tendon of the clavatus muscle; tent, tentacles; trab, trabecula. Scale bar: 500 μm.

Fujimoto et al. BMC Evolutionary Biology 2013 13:15   doi:10.1186/1471-2148-13-15
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