Gastralia

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Science and technology

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What Wikipedia says

Gastralia (sing.: gastralium), or abdominal ribs, are dermal bones found in the ventral body wall of modern crocodilians and tuatara, and many prehistoric tetrapods. They are found between the sternum and pelvis (collectively forming the gastral basket), and do not articulate with the vertebrae.

Excerpt from the Wikipedia article “Gastralia”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Richard Lydekker, Public domain, via Wikimedia Commons.