Echinoderms of Zihuatanejo

PHYLUM ECHINODERMATA

-Sea Urchins and Sea Cucumbers (Subphylum Echinozoa)

-Sea Urchins, Sand Dollars, and Heart Urchins (Class Echinoidea)

-Sea Urchins (Subclass Euechinoidea)

-Infraclass Carinacea

-Subterclass Echinacea

-Order Camarodonta

-Infraorder Echinidea

-Superfamily Odontophora

-Toxopneustids (Family Toxopneustidae)

-Genus Toxopneustes

-Rose Flower Urchin (Toxopneustes roseus)

The Rose Flower Urchin (Toxopneustes roseus) is a species of venomous sea urchin belonging to the family Toxopneustidae. It is known for its beautiful appearance and potent venom. Despite its delicate look, this urchin is highly toxic and can deliver painful stings through specialized structures called pedicellariae. It is pink, lavender, or rose-colored hues, often with white or yellowish tinges. Short, stubby spines covered by soft, petal-like structures, giving it a flower-like appearance. Found in tropical and subtropical waters of the eastern Pacific Ocean, including the coasts of Mexico, and Central America.

Diet

Feeds primarily on coralline algae, particularly rhodoliths, which it grazes from the seafloor.
It is an active “collector” urchin and may gather pieces of algae, coral rubble, and other debris on its upper surface while feeding.

Range

Tropical eastern Pacific, ranging from Baja California and the Gulf of California south along the Pacific coast of Central and South America to northern Peru, including the Galápagos Islands.
It occurs along the Mexican Pacific coast, including Guerrero, and has been specifically recorded from Ixtapa-Zihuatanejo.

Habitat

Usually found in shallow rocky environments associated with coral reefs, rhodolith beds, coralline algae, and patches of sand.
Occurs from the intertidal zone to approximately 50–60 metres, although most observations are from shallow water.
Individuals are generally solitary but can form aggregations of several dozen animals where suitable food and habitat are available.

Description

A distinctive flower urchin with a rounded test and numerous conspicuous, flower-like pedicellariae covering the upper surface.
The test is typically a relatively uniform pink, rose, reddish, brownish, or purple colour, distinguishing it from the variegated Toxopneustes pileolus of the Indo-West Pacific.
The pedicellariae are stalked, grasping structures capable of delivering venom and should not be touched.
Adults can reach roughly 8–10 cm in diameter; the test is often partly concealed by pieces of rubble, algae, or other debris collected on its surface.