The Genus Trachyscaphites has a very ornate conch (shell) which is usually small to medium in size. The surface of the shell is covered with many tubercles (bumps), clavi (elongated bumps that follow the curvature of the shell), bullae (bumps that radiate from the center to edge), and ribs which radiate from center to edge. The phragmocone (the part of the shell that the animal no longer lives in) is involute (very tightly coiled). The living chamber is straightened and separates from the phragmocone before it curves back at the opening. There can be as many as five or more rows of tubercles on the sides of the phragmocone which increase in size as they radiate out from the umbilicus to the venter (outside edge). The ribs are straight and tend to incorporate or go between the tubercles and are tightly spaced, joining at the venter. The Trachyscaphites genus is limited to the Campian period of North America and Europe.

Trachy = rough + scaphe = boat + ites = a stone.

Kingdom: Animalia, Phylum: Mollusca, Class: Cephalopoda, Order: Ammonoidea, Family: Scaphitidae, Genus: Trachyscaphites.

Trachyscaphites sp.
	Quantity in Basket: None Code: SDA-121 Price: $75.00 Shipping Weight: 0.90 pounds
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Time: Campanian Stage, approximately 82-71 million years ago. Location: Pierre Shale, South Dakota, USA Dimensions: 4-1/4" x 2-3/4" x 1-1/2"