An effective date or as of date is the date upon which something is considered to take effect. This may be different from the date upon which the event actually occurs or is recorded.
The Eunectes Four. Four species of semiaquatic South American boas go by the name of anaconda. One is the green anaconda (Eunectes murinus), which occurs in countries such as Brazil, Bolivia, Peru, Ecuador, French Guiana, Guyana, Colombia, Venezuela and the island of Trinidad. The yellow anaconda (E. notaeus) is the only other Eunectes species commonly seen in the pet trade.
Anaconda Snake. Anacondas are four species of aquatic boa inhabiting the swamps and rivers of the dense forests of tropical South America. The Yellow Anaconda can be found as far south as Argentina. It is unclear how the name originated so far from the snakes native habitat.