Fire Coral – Millepora exaesa

, Fire Coral, Millepora exaesa

Fire Coral, scientifically known as Millepora exaesa, is a colonial cnidarian that resembles true coral but is, in fact, a hydrozoan. This fascinating creature is commonly found in shallow, tropical waters and is renowned for its stinging polyps, which can cause painful burns to unsuspecting divers and swimmers.

Description & Characteristics

Millepora exaesa, commonly known as Fire Coral, exhibits a distinct morphology. Its colonies typically take on a branching, crustose, or encrusting form, resembling the appearance of true corals. However, unlike corals, Fire Coral lacks a calcium carbonate skeleton and instead has a hard, chitinous exoskeleton. This exoskeleton is what gives Fire Coral its characteristic rough texture and is responsible for the stinging sensations experienced by those who come into contact with it.

Fire Coral colonies can reach impressive sizes, with some specimens growing to several meters in diameter. They thrive in shallow, tropical waters, typically residing in the intertidal zone and extending down to depths of 30 meters.

Habitat and Occurrence

Millepora exaesa exhibits a wide distribution throughout the tropical and subtropical regions of the world. This species is commonly found in the Caribbean Sea, the Gulf of Mexico, and the Indo-Pacific region. Fire Coral prefers clear, shallow waters and is often found in association with coral reefs, rocky shores, and mangrove habitats. They are particularly prevalent in the neritic zone, the region of the ocean that extends from the shoreline to the edge of the continental shelf.

Taxonomy

The species Millepora exaesa belongs to the Class: Hydrozoa, Order: Anthoathecata, and Family: Milleporidae. This classification highlights its unique evolutionary lineage within the cnidarian phylum, emphasizing its distinction from true corals despite sharing superficial similarities.

Feeding

Millepora exaesa is a carnivorous organism that relies on a combination of feeding strategies. It houses symbiotic zooxanthellae within its tissues, which provide the colony with a source of energy through photosynthesis. These tiny algae harness sunlight and convert it into usable nutrients, thus contributing to the Fire Coral’s overall energy budget. However, Millepora exaesa also actively captures prey using its stinging polyps. These specialized structures contain nematocysts, which are microscopic, barbed capsules filled with venom. Upon contact with prey, the nematocysts discharge their venomous contents, paralyzing or killing the prey. Millepora exaesa then uses its tentacles to bring the captured food to its mouth, where it is digested and absorbed. This combination of photosynthetic and predatory feeding strategies allows Fire Coral to thrive in a diverse range of habitats and conditions.

Associated Species

Image References

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