Crab in action on a sea urchin. Crabs are in the subphylum Crustacea. They are decapods (having ten legs), along with lobsters, crayfish and shrimps. Crabs form an order within the decapods, called the Brachyura. Their short body is covered by a thick exoskeleton.
Plummer's Disease is a condition where there is a single hyperfunctioning nodule producing excess thyroid hormone.Henry Plummer in 1913 described a clinically distinct form of thyrotoxicosis due to solitary or multiple toxic nodules in the thyroid.I restrict the term to a solitary a toxic nodule. This nodule is an adenoma (a benign tumour).enry Plummer in 1913 described a clinically distinct form of thyrotoxicosis due to solitary or multiple toxic nodules in the thyroid. I restrict the term to a solitary a toxic nodule. This nodule is an adenoma (a benign tumour).
Mermaid Syndrome Facts. Mermaid syndrome or sirenomelia syndrome is a deadly birth defect in which the two lower limbs of the newborn are attached or fused together as one. It is named so because the two fused lower limbs look like a mermaid's tail.Let us get more informed about this grave syndrome. It is also known as sirenomelia, as mentioned earlier. 2  It is such a rare birth defect that only 1 in every 70,000 births is known to have it. 3  There are only over 300 (reported) live births of such babies. 4  More often than not, the condition proves fatal for the baby. 5  In fact, very few survive it even after surgery.