FishFace

By 342 hpf, the ceratohyal (ch) has grown considerably from that seen at 249 hpf, with a dramatic increase in dorsal-ventral size at the posterior end. Articulations of the ceratohyal with the interhyal (ih), the contralateral ceratohyal, and branchiostegal rays 1, 2, and 3 (bsr1, bsr2, bsr3) are visible. The ventral hypohyal (hhv) bone has now spread posteriorly in the perichondrium across a deep cleft that has formed at the ventro-anterior tip of the ceratohyal. Also visible is the epihyal (eh) bone in the dorso-posterior aspect of the ceratohyal perichondrium, which in lateral view’ is covered by the interopercle (iop).