Distribution
Midvalley fairy shrimp have been found in shallow vernal pools, vernal swales and various artificial ephemeral wetland habitats in the following California counties: Sacramento, Solano, Yolo, Contra Costa, San Joaquin, Madera, Merced and Fresno. Since the U.S. Fish and Wildlife Service published our 90-day finding on a petition to list the species in April, 2003, more new sites have been documented. The total number of occurrences documented in the California Natural Diversity Database is 63 as of February 2006.
The increase of known locations lends additional support to the idea that the range and distribution of midvalley fairy shrimp is greater than the distribution of known occurrences. The species has only been formally described since June 2000, and less formally described since 1999. The record of known occurrences therefore may poorly reflect the actual extent of the species distribution. The CNDDB does include occurrence sightings dating back to 1989, but these early sightings are all based on individual shrimp from the collection of Denton Belk, one of the authors of the formal description. Since male and female midvalley fairy shrimp closely resemble male Conservancy fairy shrimp and female vernal pool fairy shrimp, many occurrences could have been overlooked in many surveys conducted prior to about 1998.
Read more about this topic: Midvalley Fairy Shrimp
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