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Fig. 19. Schematics of the central circulation in synbranchids. A Synbranchus marmoratus, B Synbranchus madeirae, C Ophisternon afrum, D Monopterus albus, E Monopterus cuchia, F Monopterus boueti. Da dorsal aorta; Hyd hyoidean artery; Ic internal carotid artery; Va ventral aorta. Roman numerals indicate the number of gill arches. Black ellipsoids in B and C represent the median sinus in the buccopharyngeal epithelium. Reprinted and modified with permission from Am. Mus. Nat. Hist., 157, Rosen and Greenwood, A fourth neotropical species of synbranchid eel and the phylogeny and systematics of synbranchiform fishes, 1–69, Figs. 51–56, © 1976, courtesy The American Museum of Natural History.

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