Manta Ray Anatomy and Identification: The Three Species and How to Tell Them Apart

There are three species of manta ray: the reef manta ray (Mobula alfredi), the oceanic manta ray (Mobula birostris), and the Atlantic manta ray (Mobula yarae). They share the same body plan, a broad diamond-shaped disc with a filter-feeding mouth flanked by two flexible cephalic lobes, and they are told apart by the shape of the white patches on their shoulders, the color of the mouth and belly, the presence or absence of a small residual spine near the tail, and the texture of their skin. Every individual also carries a unique pattern of spots on its belly, which is how scientists recognize the same manta across decades.

This guide is written by the scientists of the Marine Megafauna Foundation, whose research described all three manta ray species and underpins their IUCN Red List assessments.

How many species of manta ray are there?

Three species are currently recognized, and two of them have been recognized only since 2009. For decades before 2009, science treated all manta rays as a single species. In 2009, working from animals off southern Mozambique and from specimens and photographs gathered worldwide, MMF co-founder Dr. Andrea Marshall and colleagues showed that there were at least two: the larger, more widely distributed oceanic manta, and a smaller, more tropical coastal species for which they resurrected the nineteenth-century name alfredi. The split rested on consistent differences in coloration, teeth, skin denticles, the tail spine, size at maturity, and maximum size, and it came with a visual key so that the two could be separated in the field or from a photograph.

Genetics soon backed the split. A study co-authored by MMF scientists found that the two species share no haplotypes at two key genes, the stretches of DNA used to compare lineages, and estimated that they diverged less than half a million years ago, with some gene flow between them since. That is very recent by evolutionary standards, which helps explain why the two looked like variants of one animal for so long.

The 2009 paper also flagged a probable third manta in the Atlantic, but there were too few specimens to name it. Genetic work on mantas off Isla Holbox, on Mexico’s Yucatán Peninsula, then found a distinct lineage that diverged from the oceanic manta less than 100,000 years ago, and genome-wide data produced robust evidence for a new manta species in the Gulf of Mexico. In July 2025, a team led by Nayara Bucair, with MMF scientists including Jessica Pate among the authors, formally described it as the Atlantic manta ray, with type material collected by our Florida Manta Project.

The genus name has changed too. Molecular studies found that manta rays sit inside the devil ray group rather than beside it, so a 2018 reclassification folded the genus Manta into Mobula. Papers and field guides written before then use Manta alfredi and Manta birostris. Each species now has its own page: the reef manta ray, the oceanic manta ray, and the Atlantic manta ray.

How do you tell a reef manta from an oceanic manta?

Look at the shoulders, the mouth, and the belly. Both species are black or dark gray on top with pale shoulder patches, but on an oceanic manta the front edge of each patch runs from the spiracle in a straight line parallel to the jaw. On a reef manta, the front edge first runs backward from the spiracle and then curves toward the midline. The spiracles are the small openings just behind the eyes through which a ray can draw water.

Underneath, the differences are just as consistent. The oceanic manta has a black to charcoal-gray mouth, with the dark color often extending back toward the first gill slits; its belly spots are concentrated on the abdomen and do not appear between the five pairs of gill slits; and the rear third of its underside is charcoal, forming a dark V-shaped margin along the trailing edges of the pectoral fins. The reef manta has a white to light-gray mouth, spots that can occur between the gill slits and across the rear of the pectoral fins, and a paler band on the trailing edge of each fin that typically reaches only partway toward the body.

Size helps, but only at the extremes. Most adult reef mantas in our Mozambique study measure 3 to 4.9 meters (10 to 16 feet) across, and the largest individuals seen there were a little over 5 meters. Oceanic mantas reach at least 7 meters (23 feet), with anecdotal reports to 9.1 meters (30 feet). A young oceanic manta and an adult reef manta can be the same size, however, so color pattern is the reliable field mark. The size chapter covers measurements in detail.

Habitat gives a further clue. Reef mantas are commonly seen within a few kilometers of land around coral and rocky reefs, island groups, and upwelling coastlines across the Indian and Pacific Oceans, while oceanic mantas are more often associated with offshore islands, pinnacles, and seamounts. Where both live on the same coastline, as in southern Mozambique, an observer needs the color characters to be sure. The movements chapter maps each species’ range.

How is the Atlantic manta ray different?

The Atlantic manta ray looks much like an oceanic manta but differs in its belly pattern, its shoulder markings, its skin, its teeth, and its DNA. The 2025 description separates it from the oceanic manta on the ventral color pattern, V-shaped shoulder patches, star-shaped skin denticles with unbranched ridges, a caudal bulb carrying a residual spine, and 9 to 13 rows of teeth, backed by genetic data. It shares the oceanic manta’s tail spine, but its tooth count is intermediate.

The 2009 paper, working from limited specimens, described the Atlantic animal’s belly spots as confined to the area behind the fifth gill slits and often centered on the abdomen, with a dark fin margin that does not always form the oceanic manta’s clean V. It also recorded animals over 6 meters (20 feet) across. The ventral pattern has since proved more variable than those early descriptions implied, so a belly photograph is the working field character rather than a guarantee.

The Atlantic manta is found only in the Atlantic, from the eastern United States and the Gulf of Mexico through the Caribbean to Brazil, where it lives side by side with the oceanic manta. It has no IUCN Red List assessment yet, whereas the oceanic manta is listed as Endangered and the reef manta as Vulnerable. Western Atlantic records published before 2025 appear under several names, including Manta birostris, Mobula birostris, and qualified forms such as “Mobula cf. birostris”, and may include either species. That is one reason the description matters for conservation: until it had a name of its own, the Atlantic manta could not be assessed or protected as a species in its own right.

What are the “horns” on a manta ray’s head?

The horns are cephalic lobes, paired flaps of muscle on either side of the mouth that unroll to funnel water and food into the mouth when a manta feeds. They are a defining feature of manta and devil rays. In reef mantas, each lobe can reach about 11% of disc width, and the lobes can be held flat, curled at the tips, or rolled up completely. A feeding manta swims with its lobes unrolled and its mouth and gill slits open.

The lobes do more than steer food. MMF scientists filmed reef mantas at cleaning stations in Raja Ampat, Indonesia, and found that lobe movements changed when mantas approached each other, approached divers, or interacted with cleaner fish, and that each lobe could be moved independently. The lobes appear to lack electrosensory organs, and there is no evidence of taste receptors on them, so the study concluded that gestural communication is the most likely extra function, while noting that sensing water movement or helping to direct water toward the nostrils remain possibilities.

The rest of the body is built for open-water life. The disc is roughly 2.2 to 2.4 times as broad as it is long, with long, pointed pectoral fins that the manta flaps like wings, a small dorsal fin, and a slender, whip-like tail that in reef mantas is about 1.2 times the length of the body when intact. Drone footage of mantas off Florida found that feeding mantas beat their fins faster than traveling mantas, at about 0.67 beats per second against 0.49, and that mantas resting in strong currents swam at the minimum effort needed to hold position. Like other open-water rays, mantas also have larger eyes than their bottom-dwelling relatives.

How does a manta ray filter its food?

A manta swims forward with its mouth open, and plates on its gills sieve out zooplankton while the water passes out through the gill slits. The cephalic lobes guide water into the wide, forward-facing mouth, where food particles are caught by the gill rakers, which in manta and devil rays are modified into rigid sieving plates, before the filtered water exits through the five pairs of gill slits on the underside. Because it relies on forward motion to drive water through the mouth, this is called ram filter feeding.

Those gill plates are the anatomical feature that has cost mantas most. Dried manta and devil ray gill plates are sold in Asian dried-seafood and traditional medicine markets, and this trade has been a primary driver of the fisheries behind many mobulid declines. The threats chapter explains the trade and the protections now in place, and the feeding chapter covers what mantas eat, how deep they forage, and the strategies they use at the surface.

Do manta rays have teeth?

Yes, but they do not use them to eat. Manta teeth are tiny, about 1 to 2 millimeters (less than a tenth of an inch) long, set in a band across the lower jaw. A reef manta has 6 to 8 rows totaling roughly 900 to 1,500 teeth, and no teeth in the upper jaw; an oceanic manta has 12 to 16 rows totaling 3,000 to 4,000 teeth, plus at least two rows of enlarged denticles along the upper jaw.

For a filter feeder, the teeth are a puzzle. During mating, a male grips the female’s pectoral fin in his mouth, and our Mozambique study found that the resulting abrasions from male teeth occur almost solely on the left fin. The study noted that mantas may have retained their teeth for mating alone, an idea that fits the evidence but has not been tested directly. The reproduction chapter describes courtship and mating in full.

Do manta rays have stingers?

No. Manta rays have no functional sting, and reef mantas have no tail spine at all. The oceanic and Atlantic mantas carry a reduced spine, but it is encased in a calcified knob on top of the tail just behind the dorsal fin, and its tip projects only about 3 millimeters (one-eighth of an inch) from the surrounding mass. It is a reduced remnant, not a weapon. The reef manta has no distinct spine or calcified mass at the base of the tail, only a small hump or a slight groove in some individuals.

Mantas are harmless to people. Early accounts portrayed manta and devil rays as ferocious creatures and accused them of stealing boats and killing divers, but it is now known that they are harmless to humans and feed mainly on zooplankton. The risk runs the other way: entanglement, boat strikes, and crowding by tourists can injure mantas, which is why the tourism chapter sets out an evidence-based code of conduct for swimming with them.

What does a manta’s skin feel like?

Like the skin of sharks, a manta’s skin is covered in dermal denticles, small tooth-like scales, and their shape differs between species. Oceanic manta skin forms distinct ridges and furrows densely embedded with overlapping, multi-cusped denticles, which makes it much rougher than reef manta skin. The reef manta’s denticles are small, evenly spaced, and do not overlap, each with a star-shaped base and a rounded knob. The Atlantic manta has star-shaped denticles too, with unbranched ridges. Skin texture is one of the five field characters in the 2009 identification key.

Are manta rays intelligent?

Manta and devil rays have large brains compared with most sharks and rays, and researchers link this to their complex social lives, though most of the evidence is indirect. Studies of brain anatomy have found an enlarged telencephalon, the forebrain region generally associated with sensory processing, memory, and learning, and researchers have suggested this indicates a capacity for “social intelligence”. Animal-borne cameras fitted to reef mantas in the Maldives and oceanic mantas in Mexico found that reef mantas spent an average of 43% of their recorded time interacting with other mantas, against 8% for oceanic mantas, and also captured the first recorded interactions between reef mantas and a devil ray species.

The behavioral evidence for social structure is clearer than the evidence for intelligence as such. Over five years in Raja Ampat, Indonesia, a study co-authored by MMF scientists recorded more than 500 groups of reef mantas and, using a method that separates genuine social preferences from chance encounters, found longer-lasting preferences mostly between females, in a society whose groups regularly split and re-form around favored cleaning stations. Later acoustic tracking of 27 reef mantas in the same region showed that social affiliations fell into spatially defined communities that remained stable for weeks to months, and that individuals that stayed close to one site had stronger social ties.

How do scientists identify individual manta rays?

Each manta has a unique pattern of dark spots and patches on its belly, and a photograph of that pattern identifies the individual for life. Our Mozambique study found that these natural markings were unique to individuals and did not change substantially over time, and standardized the identification area as the region from the first gill slits back to the pelvic fins, which shows the most distinctive patterns and also the animal’s sex. The pattern forms before birth: a near-term reef manta fetus examined in Mozambique already carried ventral spots similar in style to those of free-swimming mantas.

This method, called photo-identification, turns every good belly photograph into a data point without touching the animal. Matching thousands of images by eye is slow, so MMF scientists helped develop Manta Matcher, an automated pattern-recognition system that copes with the variable lighting and angles of underwater photographs, tested on 720 images and built into a global online database. The scale of the resulting catalogs is what makes population science possible: 1,085 reef mantas identified in Komodo National Park, 583 at Závora Bay in Mozambique, and 2,803 oceanic mantas off coastal Ecuador.

Scars help too. In our Mozambique bite study, shark-bite marks remained visible and similar in shape to the original wound in re-sighted mantas, in some cases for almost three years, so they serve as secondary marks. Photo-identification is also how researchers know that individual mantas have been seen over more than 30 years; the lifespan chapter explains what those records reveal.

Why are some manta rays black?

Some mantas are melanistic, meaning almost entirely black on both sides, and this color morph occurs in both reef and oceanic mantas at frequencies that vary enormously between places. A melanistic manta is black on top and predominantly black underneath, apart from a variably sized white blaze along the midline where its spot pattern can often still be seen, so it can still be photo-identified. Analysis of belly coloration confirmed that the two forms are genuinely distinct color morphs rather than ends of a continuum.

Using photo-identification catalogs across the Indo-Pacific, MMF scientists found that the frequency of melanism in reef mantas ranged from none in Hawaii to 40.7% in Raja Ampat, the highest in the study, and in oceanic mantas from 0.7% in Mozambique to 16.4% in Ecuador. Sex had no apparent effect.

The same study then asked whether color affects survival. Using mark-recapture modeling, which estimates survival from how often known individuals are re-sighted, it compared black and normally colored reef mantas in three populations and found no difference in survival between the morphs. Black coloration therefore does not seem to make reef mantas more or less vulnerable to predators in the populations tested, and the differences between populations are most likely the result of neutral genetic processes such as drift.

The opposite morph is much rarer. Leucistic mantas have extensive white on the back and a near-white face and mouth; when the species were described in 2009, fewer than 20 leucistic reef mantas and fewer than a dozen leucistic oceanic mantas had been documented worldwide. Apart from color, leucistic mantas share the other characters of their species.

What do the scars on manta rays mean?

Most scars on manta rays come from shark bites, and many of the mantas that divers see carry healed bite wounds; injuries from fishing line and boat propellers are also frequent where mantas live near people. In southern Mozambique, our three-year study of 371 identified reef mantas found that 76% carried shark-bite injuries, with 571 bites recorded in total. Over 96% of bites were on the rear of the body, mostly along the trailing edges of the pectoral and pelvic fins, which suggests that sharks attack from behind. Bull and tiger sharks were suggested as the main attackers. These figures describe the survivors, however: the study could not determine how many mantas, particularly small juveniles, are killed by sharks or later succumb to their injuries.

Mantas heal well. More than 90% of the bite marks recorded in the Mozambique study were fully healed, and fresh wounds that were followed over time took no more than 225 days to close, one in only 126 days. Young Atlantic mantas off Florida healed even faster: four propeller wounds on three individuals closed completely within 15 to 44 days. Sharks are not the only natural predators, either; killer whales have been recorded preying on an oceanic manta in the southwest Indian Ocean.

Human-caused injuries tell a different story. In the same Florida study, 27% of the mantas carried fishing-line entanglement injuries, alongside propeller wounds. A Manta Trust analysis of 73,638 photo-identification sightings in the Maldives found that natural bites were the most frequent injury, but entanglement in fishing line was the most common human-caused one, concentrated in the atolls with the most boat traffic, fishing, and tourism. Because scars persist, photo-identification catalogs double as long-term records of these threats.

What is the difference between a manta ray, a devil ray, and a stingray?

Manta rays are the largest members of the devil ray genus Mobula, and devil rays in turn belong to the same broad group as stingrays, but mantas and devil rays are open-water filter feeders without a functional sting. Within Mobula, mantas are distinguished from devil rays by a terminal mouth at the front of the head, a broader head relative to disc width, and differences in the spiracles and filter plates; devil rays have their mouths on the underside of the head. Most devil rays are also smaller. The species long called the “giant devil ray” (Mobula mobular) reaches only about 3.5 meters (11 feet) and owes that name largely to oceanic mantas misidentified in the Mediterranean.

Stingrays are more distant relatives. Manta and devil rays form a family, the Mobulidae, within the order that also contains stingrays and eagle rays, and dated molecular analysis suggests the mobulids split from their closest relatives, the cownose rays, around 30 million years ago. The earliest fossil record of mantas themselves is from about 4.8 million years ago. Most stingrays live on or near the seabed and feed on bottom-dwelling invertebrates, and many defend themselves with a venomous tail barb; mantas swim continuously through open water, filter plankton, and have at most the vestigial, encased spine described above. The facts page sets out these differences in brief.

Why it matters for conservation

Every conservation measure for manta rays depends on knowing which manta is which. Before 2009, records of catches and sightings lumped two species with different ranges, sizes, and threats into one, and the 2009 paper argued that splitting the genus would help highlight the specific threats facing each species and allow each to be assessed properly. Separate Red List assessments followed, listing the oceanic manta as Endangered and the reef manta as Vulnerable. Since 2025, the Atlantic manta has had a name of its own, so it can now be assessed in its own right.

The anatomy described here is also the toolkit for the work that follows. Belly spots allow researchers to count populations and track individuals for decades without harm; scars record what those individuals have survived; and color morphs and body measurements reveal how populations differ from one another. MMF’s research programs in Mozambique, Indonesia, Florida, and Hawaii build on exactly these features, and every new photograph adds to the record. To support that work, adopt a manta ray to support new research on manta rays.