Fig. 2: Development of L. orbiculatus prior to and post hatching from the egg masses.
From: Microbial communities in developmental stages of lucinid bivalves

Scale bars = 20 µm. A Individual larva prior to hatching removed from inside the egg mass and fixed. No gills are visible. B Larva fixed 10 days after hatching. Individual, small gill filaments are already detectable (highlighted in white box). C Larva 21 days after hatching, gills visible. D Larva 54 days after hatching from the egg mass. Gills are shown in white boxes for C and D.