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8 hpf Development

[ Back to Pharyngeal development: Pre-skeletal]

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8 hpf
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By 199 hpf, the pharyngeal skeleton includes Meckel’s (Mk), palatoquadrate (pq), basihyal (bh), ceratohyal (ch), interhyal (ih), hyosymplectic (hs), ceratobranchial (cb), copula 1, and hypobranchial cartilages, and maxilla (mx), dentary (d), retroarticular (ra), entopterygoid (en), ceratohyal bone (chb), hyomandibula (hm), opercle (op), and ceratobranchial 5 (cb5) bones. The branchiostegal rays now comprise the initial two posterior (bsr2, 3), as well as one more anterior (bsr1), bones. Other bones visible here between 6 dpf and 8 dpf include the anguloarticular (aa) and quadrate (q) bones, derived from the first pharyngeal arch, and the interopercle (iop) and subopercle (sop) bones, derived from the second pharyngeal arch. Also visible are the scleral (sc) cartilage of the eye and the coraco-scapular (cor) cartilage and the cleithrum (cl) bone of the pectoral fin skeleton.