FIG. 4 in A new look at the Cretaceous Lamprey Mesomyzon Chang, Zhang & Miao, 2006 from the Jehol Biota

FIG. 4. — Close-up of some anatomical structures of Mesomyzon Chang, Zhang & Miao, 2006: A, head of IVPP V 15035A; B, naso-hypophysial complex and adjacent structures of IVPP V 15449; C, oral disc and associated structures of IVPP V 15027A; D, details of gills and branchial skeleton of IVPP V 15449; E, details of the branchial apparatus of IVPP V 15027A; F, imprints of the brain and some cranial nerves of IVPP V 15450.3. Abbreviations: alc, anterior lateral cartilage; nhd, naso-hypophysial duct; fr, presumed position of fossa rhomboidea; g1, gill filaments of the first gill; nsc2, ventral spino-occipital radix nerve. See Figures 1 and 2 for other abbreviations. Scale bars: 5 mm.Published as part of Wu, Feixiang, Chang, Mee-Mann & Janvier, Philippe, 2021, A new look at the Cretaceous Lamprey Mesomyzon Chang, Zhang & Miao, 2006 from the Jehol Biota, pp. 1293-1307 in Geodiversitas 43 (23) on page 1303, DOI: 10.5252/geodiversitas2021v43a23, http://zenodo.org/record/576467