HIGHLIGHTS
SUMMARY
Despite ongoing debate over the usefulness of the "living fossils" concept, there has been an increase over the last forty years in the number of biological entities identified as living fossils as well as an increase in the number of publications where the term is used (Lidgard and Love, 2021). Stalked crinoids have been referred to as living fossils because they were more speciose and abundant in shallow marine environments in the Paleozoic and are now largely restricted to the deep sea, but still look like their Paleozoic ancestors and in some cases have . . .
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