Figure 1 in The anatomy of the thyroid gland among "fishes": phylogenetic implications for the Vertebrata

Figure 1. - Sagittal section of a frozen small-spotted catshark, Scyliorhinus canicula (Scyliorhinidae); left lateral view. The black arrow indicates the anterior part of the specimen. The thyroid gland is compact, pattern 1. Modified from Chanet et al., 2009a. br = brain; cart.pe = cartilaginous pericardium; chc = chondrocranium; el.br.sk = elements of the branchial skeleton; m = mouth; olf.cap = olfactive capsule; th = thyroid; v = ventricle. Scale bar = 10 mm. Figure 2. - Sagittal section of a frozen common carp, Cyprinus carpio (Cyprinidae); right lateral view. The black arrow indicates the anterior part of the specimen. Several thyroidian islets are seen; the thyroid is diffuse, pattern 2. ant.ch.gs.bl = anterior chamber of the gas bladder; at = atrium; b.c = buccal cavity; bl.v = blood vessels; br = brain; l = liver; th.i = thyroid islets; v = ventricle; v.ao = ventral aorta. Scale bar =10 mm. Figure 3. - Dissection of the bucco-branchial region of a common sole, Solea solea (Soleidae); right lateral view. The black arrow indicates the anterior part of the specimen. Several thyroidian islets are seen; the thyroid is diffuse, pattern 2. Modified from Chanet, 2011. b.c = buccal cavity; g = gills; th.i = thyroid islets; u = urohyal. Scale bar = 10 mm.