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Prionocidaris bispinosa

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description Prionocidaris bispinosa Overview

Prionocidaris bispinosa is a species of cidaroid sea urchin belonging to the family Cidaridae, commonly known as pencil urchins. This marine invertebrate is characterized by a rigid, spherical test and thick, widely spaced primary spines that mount on prominent tubercles. The spines are distinctively smooth and often distinct from the secondary spines that cover the rest of the body. It inhabits deep-water benthic environments across the Indo-Pacific region, where it plays a role in the benthic ecosystem.

help Prionocidaris bispinosa FAQ

What makes the Prionocidaris bispinosa sea urchin unique?

Prionocidaris bispinosa is a cidaroid sea urchin distinguished by its large, widely spaced primary spines. Unlike typical sea urchins, these thick spines are mounted on prominent, raised tubercles found across its rigid test.

Where is Prionocidaris bispinosa found?

Prionocidaris bispinosa is a marine benthic species that dwells on the ocean floor. These sea urchins are typically found in the Indo-Pacific region, where they navigate rocky substrates and coral rubble using their distinct spines.

How does Prionocidaris bispinosa use its prominent spines?

The large, widely spaced spines of Prionocidaris bispinosa are primarily used for defense against predators in the deep sea. Additionally, these prominent spines can help wedge the sea urchin securely into rocky crevices to prevent it from being swept away by ocean currents.

Is Prionocidaris bispinosa related to prehistoric sea urchins?

Yes, Prionocidaris bispinosa belongs to the cidaroid family, which is an ancient lineage of sea urchins. Their distinct, thick spines and rigid tests share a remarkably strong resemblance to prehistoric echinoids found in the fossil record.

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