title: An approach to the phylogeny of the order Echinoida using interfamily hybrids.
authors.affiliation: The Comprehensive Educational Center of Iwate, Hanamaki, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Hata
mesh_terms: D000818:Animals; D006824:Hybridization, Genetic; D007814:Larva; D010802:Phylogeny; D012617:Sea Urchins / Q000145:classification* / Q000254:growth & development / Q000502:physiology; D013045:Species Specificity