Washington ? Scientists searching the Amazon have discovered new species — creatures such as a baldheaded parrot, a blue-fanged tarantula and a bright red catfish — at the rate of about one every three days for the past 10 years, the World Wildlife Fund reported Monday.

Scientists searching the Amazon have discovered new species, including a blue-fanged tarantula (Ephebous cyanognathus) — a remarkable-looking spider discovered in French Guiana in 2000, the species is entirely brown except for two vivid blue fangs- at the rate of about one new species every three days for the past 10 years, the World Wildlife Fund reported on Monday.

The 4-meter-long Eunectes beniensis, the first new anaconda species identified since 1936.

Martialis heureka, which translates roughly as “ant from Mars,” because it has a combination of characteristics never before recorded.

“What we say now, and we’re very conservative, is one in 10 known species is found in the Amazon,” said Meg Symington, a tropical ecologist and the fund’s managing director for the Amazon. “We think when all the counting is done, the Amazon could account for up to 30 percent of the species on Earth.”

The great diversity of life in the Amazon includes species and habitats that have direct benefits for people worldwide, Symington said. Compounds found on the skin of the poison dart frog, for example, turned out to be important for anesthesia and other medical products.

The World Wildlife Fund reviewed scientific literature and counted more than 1,200 new species — including 637 plants, 257 fish, 216 amphibians, 55 reptiles, 16 birds and 39 mammals — that were discovered in the Amazon from 1999 to 2009. The full count would be much higher, because the report didn’t include the vast majority of newly found invertebrates.