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Summary Stage Literature (154) Attributions Wiki

Name: NF stage 39

XAO ID: 1000051

Definition: "Nieuwkoop and Faber stage 39, corresponding to an embryo of age 2 days, 8 hr 30 min at 22-24 Celsius and having the following external morphological criteria: Melanophores appearing around nasal pits. Opening of stomodeal invagination transversely elongated. Melanophores on back arranged in a superficial and a deeper layer. Outlines of proctodeum and tail myotomes forming angle of about 135 degrees. Melanophores appearing along ventral edge of tail musculature. Length: 5.9 - 6.5 mm."

Preceded By: NF stage 37 and 38 Succeeded By: NF stage 40