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Biotalker posted a topic in General Fossil DiscussionI was fascinated by this eurypterid fragment from Ukraine because it has a rough symmetrical pattern on the dorsal surface of the cephalothorax. There is a midline structure with apparent tracts leading to the eyes and perhaps other structures (like downwards toward the abdomen). It doesn’t look like ventral appendages of the cephalothorax projecting dorsally. This has the appearance of some internal structure, fossilized with perhaps some part of the dorsal exoskeleton removed. While very unlikely, the tracts toward the eyes might lend some support an interpretation of a neural or
Dear Guys, I recently found one small (5 mm width) and interesting specimen that can belong to primitive xiphosuran by the appearance of cephalothorax. It has not any jaws as trilobite and the preserved eye is merostomate like (not any small eyes but only protuberant area, similar to eurypterid or other chelicerate eyes). The rick is found in Varena town, South Lithuania and the age should be about 475 million years. Please help to confirm the primitive chelicerate if you could. Regards Domas