Ecuadorian hermit crab few months, but species such as "Coenobita clypeatus" have a 23-year lifespan if properly treated and some have lived longer than 32 years. Similarly Ecuadorian hermit crabs have been known to live to over 30 years. In general, and despite their moniker, hermit crabs are social animals that do best in groups. They also require a temperature and humidity-controlled environment (ideally approximately 80% humidity or above and 75-85F), and adequate substrate to allow them to bury themselves while molting. Ecuadorian hermit crab The Ecuadorian hermit crab (Coenobita compressus) also known as the Pacific hermit crab is a species of land
History of manifolds and varieties spaces with a differentiable or topological structure, while "variety" refers to spaces with an algebraic structure, as in algebraic varieties. In Romance languages, manifold is translated as "variety" – such spaces with a differentiable structure are literally translated as "analytic varieties", while spaces with an algebraic structure are called "algebraic varieties". Thus for example, the french word "" means topological manifold. In the same vein, the Japanese word "" (tayōtai) also encompasses both manifold and variety. ("" (tayō) means various.) Ancestral to the modern concept of a manifold were several important results of 18th and 19th century mathematics. The oldest