Figure 3. – A in The lungs of extinct and extant coelacanths: a morphological and histological review

Figure 3. – A: Latimeria chalumnae. Specimen CCC5 (MNHN- ZA-AC-2012-3); Azocarmin preparation, from Millot et al. (1978). Cross section showing the vestigial lung, surrounded by four plates (arrowheads 1 to 4). Two lumen ramifications (lc) of the lung are seen (see Cupello et al., 2017a). The lumen of the lung is bordered by a monostratified epithelium (mu). mu = mucosa; oe = oesophagus; sm = sub-mucosa. B: †Axelrodichthys araripensis from the Cretaceous of Brazil, "Josa Collection" (specimen deposited at the MNHN, Paris). Transverse ground cross section of the calcified lung showing the imbricated plates (black arrow-heads) around the lumen (black asterisks) (after Clément, 1999: fig. 6). Scale bars: A = 1 mm; B = 5 mm. Deposited at the Laboratoire de Paléontologie, MNHN, Paris.