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What does a bearded fireworm look like?
Hermodice carunculata is a segmented, flattened marine worm in the amphinomid group. Its most useful identifying features are the pale bristle tufts projecting from the sides of its body and a conspicuous, branched structure called a caruncle on its head. It also has branched gills. Color varies, so it is safer to identify the worm by this combination of body shape and structures than by color alone.
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The Naturalis Biodiversity Center describes a greenish body, orange-red gills, and a squarish cross-section. Its Caribbean guide says the worm is usually up to 15 cm long and can reach 25 cm. Smithsonian Ocean describes a photographed individual from St. John at about 15 cm and says specimens can reach about twice that length. These are source-specific descriptions, not one universal size limit for every population. Naturalis Caribbean species guide; Smithsonian Ocean.
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No. “Fireworm” is used for more than one group of marine bristleworms. Smithsonian Ocean distinguishes the bearded or marine fireworm from syllid fireworms, which are different animals with distinct reproductive behavior. The scientific name, Hermodice carunculata, removes that ambiguity. Smithsonian Ocean’s guide to syllid fireworms.
Where do bearded fireworms live?
They inhabit warm-water marine environments, including reefs, seagrass beds, and rocky or other hard bottoms. They shelter beneath stones or loose material and in crevices around reefs and grass beds. The Naturalis Caribbean guide reports them from the surface to 40 m deep and describes them as common throughout the Caribbean; those details are specific to that guide’s regional account.
A 2017 review describes a broader range that includes the Atlantic, Gulf of Mexico, Caribbean, Mediterranean, and Red Sea. Local records and depth observations vary by place, so this broad range should not be read as evidence that the species is present at every site within those regions. 2017 review abstract indexed by U.S. EPA HERO.
What do Mediterranean records show?
A 2020 study compiled 857 occurrence reports from 368 Mediterranean localities. The authors described new colonization records and patterns consistent with expansion in parts of the Adriatic and western Mediterranean, and linked the pattern to sustained sea-surface warming. These are compiled reports of where the worm was recorded—not a census of population size—and the study’s interpretation does not prove that warming alone caused every local record. Righi, Prevedelli, and Simonini, Mediterranean Marine Science (2020).
Can a bearded fireworm sting you?
Its bristles can break off and lodge in human skin, causing a painful burning sensation. Smithsonian Ocean puts it this way: “Those venom-filled bristles can break off in human skin, causing an intense burning sensation.” Avoid touching, picking up, or trying to handle the animal. Smithsonian Ocean.
Experimental research published in 2021 describes bristles penetrating tissue and supports a role for both mechanical injury and chemical factors. It discusses complanine-related compounds as possible chemicals, but the precise nature and location of the active chemicals remain uncertain. “Venom-filled” is a useful description of the hazard, not a fully settled account of its chemistry. 2021 experimental study.
The sources cited here support avoiding contact but do not establish a first-aid or treatment protocol. If contact occurs and you need help, seek locally appropriate medical advice rather than relying on an improvised remedy.
What does a bearded fireworm eat?
It is a mobile predator and generalist feeder. Smithsonian Ocean documents one feeding on fire coral (Millepora) and notes prey such as corals, anemones, and crustaceans. A 2017 review also describes feeding on live cnidarians and consuming detritus. Smithsonian Ocean; 2017 review abstract indexed by U.S. EPA HERO.
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