New fish genus and species named for its red, fingerlike fins

August 5, 2015 by Michelle Ma, University of Washington
Red-fingered anglerfish (Porophryne erythrodactylus) in Australia’s Botany Bay. Credit: D. Harasti

After nearly 35 years, a color-changing fish known for its red "fingers" finally has a proper name.

University of Washington scientists recently announced the name of a and of frogfish, which are small, stocky creatures found in most tropical and subtropical oceans around the world. The fish was first seen and collected in Australia in 1980 by a UW graduate student, but the sole specimen disappeared soon after, leaving researchers no option but to shelve the discovery.

Recently, another UW graduate student, Rachel Arnold, and fisheries professor Ted Pietsch again located the elusive fish in Australia's Botany Bay near Sydney and helped collect new specimens – one of the requirements for naming a new species.

After sequencing its DNA, they realized they had in fact discovered a new genus and species.

"To find something on the genus level, a step above species, is pretty spectacular," said Pietsch, a UW professor of aquatic and fishery sciences and curator of fishes at the Burke Museum. "People have been diving and collecting in that location for hundreds of years and publishing vigorously for 100 years or more, and we find something now no one else has seen."

Now, Porophryne erythrodactylus – or Red-fingered anglerfish – has been added to the exhaustive Catalog of Fishes database maintained by the California Academy of Sciences and had its DNA housed in GenBank. It even has its own Wikipedia page.

Pink and white color variation. Credit: M. McKnight

Arnold, who graduated with a doctoral degree last spring, is the lead author of a recent paper in the journal Copeia describing the discovery.

After the first specimen disappeared in the 1980s, divers again saw the fish in 2005, and the UW scientists worked with an Australian museum to collect three specimens. The fish had two different color patterns, leading scientists to believe there were two different species under the new genus. But after Arnold sequenced DNA from each, she realized they were the same species that have the capability to change from a grayish color to one that varies from reddish-pink to orange for camouflage.

"We don't have a good idea of how many there are, but their population is very small," she said. "We do know they have a very limited geographic range and are sensitive to habitat loss."

The has a distinct red coloration on the tips of its pectoral fins. Its dorsal fins have a unique shape, allowing the fish to dart quickly over rocks. Other frogfish instead amble or "walk" across the seafloor.

Some divers have observed the fish moving its red-tipped fins, almost like it's waving its brightly colored fingers to catch the attention and curiosity of potential prey, Pietsch said, though that connection is merely anecdotal.

Red coloration is seen on the fin tips. Credit: M. McKnight

While this particular fish has only been seen off the coast of Sydney, frogfish are found worldwide, including U.S. shores along the Atlantic coast, Hawaii and as far north as Los Angeles. Most species are thriving, and their strategy is to blend into reefs and bottom rocks using their spiny, textured outer skin for camouflage.

They hardly move – and rarely swim – but when they do, they clamber across the sea bottom using their fins as "feet." They wait for crustaceans and other fish, even frogfish, to approach. Then in a split second, they open and enlarge their mouths up to 12 times the original size, sucking in the prey whole. This can all happen in as little as 6 milliseconds.

A special muscle in the esophagus keeps the swallowed prey from escaping, and the frogfish can also expand its stomach to digest its hearty meal.

"They are so odd-looking and yet so photogenic," Arnold said with a laugh.

So far nothing is planned for the Red-fingered anglerfish in terms of population counts or conservation activities, Arnold said, though its home in Sydney's Botany Bay is full of industry and has water quality issues. She hopes this species is included in any future studies because it's a native not found elsewhere.

Explore further: DNA evidence is in, newly discovered species of fish dubbed H. psychedelica (Video)

More information: "A New Genus and Species of the Frogfish Family Antennariidae (Teleostei: Lophiiformes: Antennarioidei) from New South Wales, Australia, with a Diagnosis and Key to the Genera of the Histiophryninae." Copeia: December 2014, Vol. 2014, No. 3, pp. 534-539. doi:

Related Stories

Crawling, breathing fish on a course to invade Australia

June 5, 2015

Australian marine biologists are worried that a species of perch native to Southeast Asia (the climbing perch, aka Anabas testudineus), will soon make its way onto the Australian mainland in the near future, putting native ...

School kids name new reef fish

February 11, 2014

Primary school children in Sydney have named a newly identified species of reef fish, recently described by a University of Sydney ichthyologist.

New miniature fish discovered

July 3, 2014

A newly discovered fish species measuring up to 15.4mm long has added to the global diversity of 'miniature' fish.

Recommended for you

A decade on, smartphone-like software finally heads to space

March 20, 2019

Once a traditional satellite is launched into space, its physical hardware and computer software stay mostly immutable for the rest of its existence as it orbits the Earth, even as the technology it serves on the ground continues ...

Tiny 'water bears' can teach us about survival

March 20, 2019

Earth's ultimate survivors can weather extreme heat, cold, radiation and even the vacuum of space. Now the U.S. military hopes these tiny critters called tardigrades can teach us about true toughness.

Researchers find hidden proteins in bacteria

March 20, 2019

Scientists at the University of Illinois at Chicago have developed a way to identify the beginning of every gene—known as a translation start site or a start codon—in bacterial cell DNA with a single experiment and, through ...

Turn off a light, save a life, says new study

March 20, 2019

We all know that turning off lights and buying energy-efficient appliances affects our financial bottom line. Now, according to a new study by University of Wisconsin-Madison researchers, we know that saving energy also saves ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.