There are over one million living arthropod species today. Arthropods are invertebrate animals (having no backbone or spine) with:
Shrimp - Bechleja rostrataOrder Decapoda, Family Palaemonidae
The Bechleja genus appears to have gone extinct sometime during the Eocene. Living members of the Palaemonidae family:
Crayfish - Procambarus primaevusOrder Decapoda, Family Cambaridae
Living members of the Procambarus genus are:
Spiders - 3 Unidentified SpeciesOrder Aranae
InsectsInsect fossils in the Fossil Butte Member (FBM) exist only as very thin carbon stains on the rock. Unlike fossil vertebrates (animals with a backbone), their skeletons are not visible beneath the rock. Insect specimens are found when the splitting rock layers split directly on the carbon stain.
FBM insect specimens are primarily flying or aquatic. They include:
Dragonflies & DamselfliesOrder Odonata
CricketsOrder Orthoptera, Family Gryllidae
Only 1 cricket specimen is known from the FBM. It has not yet been descried as species, yet it closely resembles the living family Gryllidae (true crickets).
Living members of the Gryllidae family are:
Last updated: December 11, 2020