Fish Active day and night

Diamond Stingray

Hypanus dipterurus

iNaturalist Wikipedia

The Diamond Stingray is a graceful architect of the Pacific seafloor, known for its sharp angular shape and incredible ability to vanish into the sand. This 'sand glider' offers a fascinating glimpse into the hidden world of our coastal shallows.

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Quick Identification

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Size

Disc width up to 1 m (3.3 ft); total length including the tail can exceed 1.5 m (5 ft).

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Colors

Uniformly olive-brown to dark gray upper surface; creamy white underside; tail typically darker or black.

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Key Features

Angular, diamond-shaped pectoral disc with pointed tips
Whip-like tail featuring both upper and lower fin folds
A distinct row of small, thorny tubercles along the midline of the back
Longer tail compared to total disc width

When You’ll See Them

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Activity pattern Active day and night

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Peak hours Highly influenced by tides; often most active during 6-9 AM and 5-8 PM.

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Season Year-round, with increased sightings in shallow water during summer months.

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Diet A benthic carnivore that feeds on clams, polychaete worms, shrimps, crabs, and small bony fish found on the seafloor.

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Habitat Coastal sandy or muddy flats, often near the edges of rocky reefs and kelp forests.

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Where Does the Diamond Stingray Live?

The Diamond Stingray is native to the eastern Pacific Ocean, stretching from the southern coast of California down through Mexico and Central America to northern Chile. This species is also a common resident of the Hawaiian Islands and the Galápagos archipelago, thriving in the nutrient-rich coastal margins of these volcanic chains. Because it favors shallow bays and estuaries, it is one of the most frequently encountered rays for coastal residents and divers along the Pacific rim.

Basemap © OpenStreetMap contributors

8 Countries

4.2M km² Range

Vulnerable Conservation

EC Ecuador

495

US United States

327

MX Mexico

83

PE Peru

33

CL Chile

8

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iNaturalist / Verified observation data

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Behavior

The Diamond Stingray is a master of camouflage, spending a significant portion of its day partially buried in the seafloor. By using its powerful pectoral fins to fan the sand, it creates a shallow depression where it can hide from predators like sharks or wait for passing prey. While they are often solitary, they are known to congregate in high-density areas where food is abundant or during the breeding season when they move into shallower, warmer coastal waters.

These rays are generally docile and will glide away if they sense a human approaching. However, they are famous for their defensive venomous spine located at the base of the tail. When stepped on by an unwary wader, the ray reflexively whips its tail upward. In the water, their movement is rhythmic and graceful, resembling underwater flight as they undulate the edges of their diamond-shaped bodies to propel themselves through the surge.

photo_camera EverydayEarth exclusive

Camera Tips

Capturing the Diamond Stingray on an AI-powered camera requires a specialized underwater setup, ideally placed where sandy seafloors meet the edges of rocky reefs. If you have access to a private dock or a safe coastal area, use a weighted camera housing or a sand-anchor to keep the lens steady. Position the camera no more than 12 inches above the sand, angled slightly downward. This low perspective is essential for capturing the ray's flat profile as it glides just inches above the substrate.

Since Diamond Stingrays are masters of blending in, lighting is critical. While they are active during the day, their activity often peaks during the low-light hours of dawn and dusk. Ensure your camera has a high-quality sensor for low-light conditions. If filming at night, avoid using a single, harsh spotlight which may startle the ray; instead, use diffused, wide-angle lighting to illuminate a larger area of the seafloor. This will help the AI distinguish the ray's angular silhouette from the surrounding sand.

Patience and placement are everything with this species. Look for natural 'highways'—narrow sandy channels between rocks or kelp patches—where rays are forced to pass through a specific area. If your camera setup allows for motion-triggering, set it to a high sensitivity or use time-lapse mode, as the undulations of a ray can sometimes be mistaken for moving kelp or water surge. Keep the lens clean from salt crust and algae to ensure the sharpest possible image for the AI identification software.

Similar Species

Species that look similar or are commonly confused with Diamond Stingray.

Longtail Stingray

Lacks the dorsal (upper) fin fold on the tail and generally has a much longer, more whip-like tail than the Diamond Stingray.

Round Stingray

Much smaller in size with a nearly circular disc shape, lacking the sharp 'diamond' angles of the Diamond Stingray.

California Butterfly Ray

Has a much wider, wing-like disc that is far broader than it is long, and a very short tail without a stinging spine.

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Frequently Asked Questions

Diamond Stingray are active during both the day and night, though their movement is often dictated by the tides. They are most frequently seen moving into shallow areas to feed during high tide, particularly in the early morning and late afternoon.

If you have a waterfront property on a sandy coast, you can attract them by maintaining a natural sandy area free of debris. They are naturally drawn to areas with high invertebrate populations like clams and worms. Avoid using artificial bait which can attract unwanted predators.

They are bottom-feeders that primarily eat clams, worms, shrimp, and small crabs. They use their pectoral fins to uncover these creatures from the sand and their plate-like teeth to crush shells.

Yes, they are very common in suburban coastal areas of Southern California and Mexico. They frequently inhabit shallow bays, estuaries, and popular swimming beaches where sandy flats are prevalent.

The easiest way to tell them apart is the tail; the Diamond Stingray has both an upper and lower 'fin fold' on its tail, whereas the Longtail Stingray lacks the upper fold. Additionally, Diamond Stingrays have a more distinctly angular, pointed disc shape.

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