How are Obregonia and  Trichodiadema different from each other?
Trichodiadema Trichodiadema is a genus of succulent plants of the family Aizoaceae.
Trichuris Trichuris, often referred to as whipworms (which typically refers to "T. trichiura" only in medicine, and to any other species in veterinary medicine), is a genus of parasite worms from the roundworm family Trichuridae, which is a type of helminth. The name whipworm refers to the shape of the worm; they look like whips with wider "handles" at the posterior end. The name "Trichocephalus" is sometimes used for this genus.