Red sea urchins, Strongylocentrotus franciscanus (A. Agassiz, 1863) range from Alaska to Baja California at depths from just below the low tide line to 90 m. It prefers rocky shores that are sheltered from strong wave action. Although the red urchin has long been called S. franciscanus, recent molecular phylogenies support changing the name to Mesocentrotus franciscanus (A. Agassiz, 1863) (Kober and Bernardi BMC Evolutionary Biology 2013, 13:88)
A low coverage sequence of this species was accomplished by the Baylor College of Medicine, Human Genome Sequencing Center under the NCBI project number PRJNA20313. The Roche 454 reads are available from the NCBI Short Read Archive SRS 000263. These sequences have been mapped to the S. purpuratus genome assembly and are available as a track on GBrowse.