Calico Tanks with Tadpole Shrimp. Notostraca Triopsidae Triops newberryi.
Dead Horse Point State Park, Utah. 6,000 feet. Colorado Plateau. Awesome potholes not too far from the visitor center.
Crazy cool! Strangely, this ephemeral pool was filled with them, and we couldn't find them anywhere else in the area, including other ephemeral pools.
The order Notostraca comprises the single family Triopsidae, containing the tadpole shrimp or shield shrimp. The two genera, Triops and Lepidurus, are considered living fossils, having not changed significantly in outward form since the Triassic. They have a broad, flat carapace, which conceals the head and bears a single pair of compound eyes. The abdomen is long, appears to be segmented and bears numerous pairs of flattened legs. The telson is flanked by a pair of...