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Description
This one has kind of a tortured phylomemetic history...My original image for the saurian (left) half was basal ichthyosaur, but I started thinking pliosaur, and eventually thalattosuchian. By then the flippers had become something fishy, and this more segmented anatomical treatment grew into additional subdermal armor reminiscent of a gar or sturgeon, which put me in mind of a derived placoderm. Eventually I decided that the "subcutaneous exoskeleton" is composed of articulated bony plates derived from the cephalopod (right) half of the body. Or whatever.

Panspermic relative of
thomastapir.deviantart.com/gal…
Ceracuttle Study
of course.

Inspiration photocopied from a Dorling Kindersley / Smithsonian handbook on fossils. The reference image provides a pretty accurate sense of scale here as well.

Description
This one has kind of a tortured phylomemetic history...My original image for the saurian (left) half was basal ichthyosaur, but I started thinking pliosaur, and eventually thalattosuchian. By then the flippers had become something fishy, and this more segmented anatomical treatment grew into additional subdermal armor reminiscent of a gar or sturgeon, which put me in mind of a derived placoderm. Eventually I decided that the "subcutaneous exoskeleton" is composed of articulated bony plates derived from the cephalopod (right) half of the body. Or whatever.

Panspermic relative of
thomastapir.deviantart.com/gal…
Ceracuttle Study
of course.

Inspiration photocopied from a Dorling Kindersley / Smithsonian handbook on fossils. The reference image provides a pretty accurate sense of scale here as well.