Stramonita haemastoma, commonly known as the red-mouthed rock shell, is a species of predatory sea snail, a marine gastropod mollusk belonging to the family Muricidae, often referred to as the murex or rock snails. This species is noteworthy for its resilient and robust shell, adapted for life in intertidal zones and rocky habitats.

• Appearance: The shell of Stramonita haemastoma is sturdy and thick, often displaying a spiraled structure with distinct spines or ridges. The coloration ranges from light brown to gray, with an interior often showing a contrasting reddish or purplish hue, hence the common name red-mouthed rock shell.
• Habitat: This mollusk is typically found in rocky shorelines, tide pools, and coral reefs. It can adapt to a wide range of environments but prefers areas where it can seek crevices for protection and optimal water flow for feeding.
• Distribution: Stramonita haemastoma is widely distributed in the Mediterranean Sea and along the Atlantic coasts, including the eastern coastline of Spain, such as in the Comunidad Valenciana.
• Diet: As a carnivorous predator, this species primarily feeds on bivalves and barnacles. It uses its radula, a specialized feeding organ, to bore holes into the shells of its prey.
• Importance to Ecosystem: By preying on other mollusks, Stramonita haemastoma plays a crucial role in maintaining the balance of the marine ecosystem, preventing overpopulation of certain species.

This species is an important component of the marine biodiversity in the Comunidad Valenciana and offers opportunities for observation to both locals and visitors interested in marine life.