title: Developmental aberrations associated with twinning in laboratory-reared sea urchins.
mesh_terms: D000818:Animals; D005260:Female; D008675:Metamorphosis, Biological; D009024:Morphogenesis; D011247:Pregnancy; D012617:Sea Urchins / Q000033:anatomy & histology / Q000196:embryology* / Q000254:growth & development; D014427:Twins