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Updated: May 29, 2025
Ceratodus is particularly interesting on account of the primitive build of its skeleton; the cartilaginous skeleton of its two pairs of fins, for instance, has still the original form of a bi-serial or feathered leaf, and was on that account described by Gegenbaur as a "primitive fin-skeleton." At the same time the gills also are developed as water-breathing organs in all these lung-fishes.
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