FIGURE 3. A specimen of Stenopterygius quadriscissus, an extinct ichthyosaur from the Early to Middle Jurassic Period.

From the following article:

Genotypic sex determination enabled adaptive radiations of extinct marine reptiles

Chris L. Organ, Daniel E. Janes, Andrew Meade & Mark Pagel

Nature 461, 389-392(17 September 2009)

doi:10.1038/nature08350

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This specimen shows live birth in an extinct marine reptile, demonstrating tail-first birth similar to cetaceans and sirenians. Copyright © The Natural History Museum, London.

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