Itagnostus interstrictus - Bolaspidella housensis

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Vendor: Gold Bugs

SKU Number: SQ5657605

A fine example of two species from the Middle Cambrian "Red Beds", Wheeler Shale Formation, Utah.

This piece has a nice association of the agnostid trilobite Itagnostus interstrictus, formerly known as Peronopsis, and a small spiny Bolaspidella housensis. The matrix has an attractive zoned color banding of green and purple.

Full dimensions are listed below.

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Vendor: Gold Bugs

SKU Number: SQ5657605

A fine example of two species from the Middle Cambrian "Red Beds", Wheeler Shale Formation, Utah.

This piece has a nice association of the agnostid trilobite Itagnostus interstrictus, formerly known as Peronopsis, and a small spiny Bolaspidella housensis. The matrix has an attractive zoned color banding of green and purple.

Full dimensions are listed below.

Vendor: Gold Bugs

SKU Number: SQ5657605

A fine example of two species from the Middle Cambrian "Red Beds", Wheeler Shale Formation, Utah.

This piece has a nice association of the agnostid trilobite Itagnostus interstrictus, formerly known as Peronopsis, and a small spiny Bolaspidella housensis. The matrix has an attractive zoned color banding of green and purple.

Full dimensions are listed below.

Specimen Details
Species Name: Itagnostus interstrictus Order / Family: Agnostida / Peronopsidae Age: Middle Cambrian Locality: Millard County, Utah Formation: Wheeler Shale
Specimen Details
Species Name: Bolaspidella housensis Order / Family: Ptychopariida / Menomoniidae Age: Middle Cambrian Locality: Millard County, Utah Formation: Wheeler Shale
Matrix Dimensions
Dimensions: In Centimeters Length: 6.50 cm Width: 5.50 cm Thickness: 1.00 cm Weight: 92 grams
Specimen Dimensions
Dimensions: In Centimeters Length: 0.55 cm Width: 0.27 cm Thickness: Negligible Weight: 92 grams
Specimen Dimensions
Dimensions: In Centimeters Length: 0.30 cm Width: 0.30 cm Thickness: Negligible Weight: 92 grams
Shipping Dimensions
Dimensions: In Inches Length: 10.0 inches Width: 7.0 inches Height: 3.0 inches Weight: Under 1.0 lbs
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Additional Information

The Wheeler Shale formation was named by Charles Doolittle Walcott. The Wheeler is a Konzentrat-Lagerstätte of soft tissued organisms preserved as carbonaceous film on calcareous shale, shaley limestone, mudstone and thin flaggy limestone.
Bollaspidella is a member of the order: Ptychopariida, a large heterogeneous order of trilobite containing some of the most primitive species known. The earliest species occurred in the second half of the Lower Cambrian, and the last species did not survive the Ordovician–Silurian extinction event.

References:

Wheeler Shale Formation
Charles Doolittle Walcott
Ptychopariida

Agnostids were small sightless trilobites that first appeared in the Cambrian period. They are assumed to have had a benthic (bottom-dwelling) mode of life, due to their association with other benthic organisms. The lack of sight would have been a disadvantage for pelagic (free-swimming) living trilobites.

References:

agnostida


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