Name: Ammonite Perisphinctes
Brand: Madagascar Treasures
SKU: 9595
Price: 6.00 USD
Availability: OutOfStock

Ammonite Perisphinctes-Fossils-Madagascar Treasures-PaxtonGate

Size

1-1.5"

1.5-2"

2-2.5"

Quantity

Price

Ethically Sourced

Secure payments

Small Business/Artisan Made

Packed With Recycled Materials

In stock, ready to ship
Inventory on the way

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These specimens date back to the Mid-Jurassic - 150 to 160 million years ago

The ammonite Perisphinctes is a genus of extinct marine cephalopods that belong to the subclass Ammonoidea. These organisms lived during the Jurassic period, approximately 150 to 160 million years ago. The genus is notable for its distinctive, coiled shell and intricate suture patterns, which provide valuable information for paleontologists studying the evolutionary history and paleoecology of ammonites.

Perisphinctes, like other ammonites, possessed a planispiral shell, meaning the shell coiled in a single plane. This coiling produced a spiral structure with numerous whorls, which are the complete 360-degree turns of the shell. The shells of Perisphinctes typically exhibit strong ribbing, with ribs extending from the inner whorls to the outer edge, providing structural support and potentially aiding in hydrodynamics.

One of the defining features of Perisphinctes is its complex suture pattern. Sutures are the lines where the septa, the walls separating the internal chambers of the shell, meet the outer shell wall. In Perisphinctes, these sutures are highly intricate and frilled, a characteristic that is often used to distinguish between different ammonite species and genera. The suture patterns in Perisphinctes are typically ammonitic, meaning they have highly convoluted and branching lobes and saddles.

Like all ammonites, Perisphinctes went extinct at the end of the Cretaceous period, around 66 million years ago, during the Cretaceous-Paleogene extinction event. This mass extinction event wiped out nearly 75% of Earth's species, including all non-avian dinosaurs and a vast majority of marine organisms. The precise causes of the K-Pg extinction are still debated, but it is commonly attributed to a combination of volcanic activity, climate change, and the impact of a large asteroid.

All minerals and fossils vary slightly in size and shape. You will receive a high quality specimen of the selected item but not the exact one pictured. All minerals, gems, stones and fossils are guaranteed to be top quality; sourced from ethical vendors around the world.

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All of our fossils are guaranteed to be 100% authentic unless otherwise stated in the product's title. Please note that we do not send physical certificates with our orders by default, as they take time to create and are often discarded. However, if you would like a physical Certificate of Authenticity included with your order, please indicate this in the comments at checkout, and we will gladly provide one. For more information about the authenticity of our fossils, click here.