|Credit: Wikimedia Commons / Nobu Tamura / CC BY-SA 4.0|
From a biologist’s perspective, a few identifying clues stand out—but only a few. One is that it had a notochord. A notochord is a stiff rod made of cartilage that runs down an animal’s back like a backbone, providing support while it is an embryo. All vertebrates and some invertebrates have notochords. In vertebrates, the notochord can later become part of the vertebral column. This makes it an important clue to one of the most basic distinctions in biology: was the Tully monster a vertebrate or an invertebrate?To read the entire article in context (or download the MP3), click on "How to Solve a Monster Mystery".
The "Tully Monster" is a strange creature known from fossils, and those are found in only one area. It defies evolution, but is not a problem for biblical creationists.