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.
(Hsiou and Albino, 2009; O'Shea, 2007). Green anacondas are the largest snakes in the world. There are records of 10 to 12 meter anacondas weighing up to 250 kg, though the actual maximal size of an anaconda is the subject of much dispute.