How are Obregonia and  Trichodiadema different from each other?
Trichodiadema Trichodiadema is a genus of succulent plants of the family Aizoaceae.
Onchocercidae The Onchocercidae are a family of nematodes in the superfamily Filarioidea. This family includes some of the most devastating human parasitic diseases, such as lymphatic filariasis, onchocerciasis, loiasis, and other filariases.