Palaechinus elegans

Palaechinus elegans is an extinct species of early Paleozoic sea urchin in the genus Palaechinus and family Palaechinidae. It belongs to an extinct echinoid lineage, not to a living species found in today's oceans. [Natural History Museum](https://www.nhm.ac.uk/our-science/data/echinoid-directory/class.html)

The genus Palaechinus is associated with Carboniferous marine rocks, within the Paleozoic Era. The exact age of a specimen labeled Palaechinus elegans depends on the geological formation and locality attached to that specimen. [Mindat](https://www.mindat.org/taxon-P168791.html)

Palaechinus belongs to the extinct order Palaeochinoida, an early branch of echinoid evolution. Modern sea urchins have a different evolutionary history, although both groups built their tests from calcite plates. [Natural History Museum](https://www.nhm.ac.uk/our-science/data/echinoid-directory/class.html)

Identification depends on the arrangement and shape of the test plates, including ambulacral and interambulacral areas, rather than on a general round shape alone. A loose fragment is difficult to identify confidently without its locality and associated plates. [Natural History Museum](https://www.nhm.ac.uk/our-science/services/collections/palaeontology/fossil-echinoderms.html)