Rare Mississippian Bear Gulch Fossil Mantis Shrimp Precursor

Part and Counterpart

Perimecturus rapax

Subphylum Crustacea, Class Malacostraca, Subclass Hoplocarida, Order Palaeostomatopoda, Family Perimecturidae

Geological Time: Mississippian (~ 320 million years old)

Size: Fossil is 50 mm long by 20 mm across (maximum) Matrix: 130 mm by 90 mm and 160 mm by 115 mm pair

Fossil Site: Heath Shale Formation, Bear Gulch Limestone, Fergus County, Montana

Code: BGF564

Price: Sold

Mississippian Bear Gulch Fossil Mantis ShrimpDescription: The Bear Gulch Limestone is a deposit of some 70 square km in extent and 30 m in depth that has been a source of one of the most diverse assemblages of fossil fish with some 110 species having been described over the past 30 years. Most were new to science, and provided a unique view of the marine Rare Mississippian Bear Gulch Fossil Mantis Shrimpenvironment of Mississippian times. Fine preservation of both fish and invertebrates is a hallmark of these deposits, presumably due to an anoxic depositional environment. This specimen is a proto mantis known as Perimecturus rapax. The genus is also known from the older Visean deposits of Scotland (~340 million years ago). The modern Mantis Shrimps are rapacious carnivores (the source of the species name) that employ a slash and grab lifestyle. Presumably this taxon shared that same modus operandi. This is a fine example of a relatively rare taxon that composes~5% of arthropods from Bear Gulch. It is seen here as a part and counterpart known as a “popoff”. The matrix is weakened along the plane of the specimen allowing it to break open as seen here.

Fossil Purchase Information

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