Hundreds of three-eyed 'dinosaur shrimp' emerge after Arizona monsoon
By Laura Geggel about 5 hours ago
Their eggs can stay dormant for decades, waiting for water.
One of the triops — a small, three-eyed crustacean — from the ball court pond at Wupatki National Monument in Arizona. (Image credit: L.Carter/NPS)
Following a torrential summer downpour in northern Arizona, hundreds of bizarre, prehistoric-looking critters emerged from tiny eggs and began swimming around a temporary lake on the desert landscape, according to officials at Wupatki National Monument.
These tadpole-size creatures, called Triops "look like little mini-horseshoe crabs with three eyes," Lauren Carter, lead interpretation ranger at Wupatki National Monument, told Live Science. Their eggs can lay dormant for decades in the desert until enough rainfall falls to create lakes that provide real estate and time for the hatchlings to mature and lay eggs for the next generation, according to Central Michigan University.
Triops' appearances are so uncommon, that when tourists reported seeing them at a temporary, rain-filled lake within the monument's ceremonial ball court — a circular walled structure 105 feet (32 meters) across — the monument's staff weren't sure what to make of the critters.
Following a monsoon in late July, "We knew that there was water in the ball court, but we weren't expecting anything living in it," Carter said. "Then a visitor came up and said, 'Hey, you have tadpoles down in your ballcourt.'"
More:
https://www.livescience.com/dinosaur-shrimp-emerge-arizona?utm_source=notification
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Wupatki National Monument
Introduction
Text-to-speech Audio
Wupatki, which means "Tall House" in the Hopi language, is a three-story Sinagua pueblo dwelling with more than 100 rooms. Before the site was permanently abandoned in 1225, the Wupatki Pueblo was the tallest, largest, and perhaps the richest and most influential pueblo around. It was home to upwards of 300 people, and several thousand more lived within a day’s walk. The Wupatki National Monument features this and numerous other settlement sites built by the Ancient Pueblo People, including the Sinagua, Cohonina, and Kayenta Anasazi. In total, there are upwards of 800 settlements on the 54-square mile site, and all of the dwellings at the site were built by the Anasazi and Sinagua Indians in the 12th and 13th centuries. Today, the Wupatki National Monument appears empty and abandoned. However, visitors to the area can discover ball courts similar to Mesoamerica and Hohokam tribes in Arizona, hundreds of ruined structures, and examples of a great cultural society that was involved in trade from as far away as the Pacific and the Gulf Coast.
More:
https://theclio.com/entry/13700
= new reply since forum marked as read
like tiny horseshoe crabs crossed with trilobites 
I knew about brine shrimp but the first time I saw these I didn't know what the hell they were!
Definitely Burgess Shale material. 
