Stage 37 (7 days) Pericardial cavity formation stage
Drown by T. Iwamatsu
(Abbr. ab: swim (air) bladder)
Stage 37 (7 days) Pericardial cavity formation stage:
The tip of the tail lies just past the otic vesicle (total length ca. 3.1 mm). The pharyngeal teeth are visible in the posterior region of the gills between the otic vesicles. The pericardial cavity (cardiac sac) surrounding the heart is easily observed. The slowly moving gut tube has a narrow lumen.