Flame Feather Duster Worm

Branchiomma luctuosum

Branchiomma luctuosum is a tube-dwelling marine annelid that can grow to about 190 mm in length. Its body is grooved and typically appears in green or brown, adorned with small dark spots. A key characteristic of this species is its brachial crown, which features large, feather-like tentacles that are usually orange or red, measuring around 24 mm but capable of reaching up to 30 mm. The crown consists of 18 to 29 pairs of spiraled radioles that are fused with a basement membrane, which helps differentiate it from other species in the Sabellidae family. This species inhabits various marine environments, particularly in the Atlantic Ocean, Mediterranean Sea, and Pacific Ocean. It prefers benthic habitats and has been recorded at depths mostly shallower than 40 meters. The worm is commonly found in coastal waters, rocky reefs, and similar environments. Since its initial description in the Red Sea, it has significantly expanded its range, likely facilitated by human activities such as boating and the Suez Canal. Branchiomma luctuosum is a simultaneous hermaphrodite, producing both male and female gametes. Its reproductive season occurs from June to October, with individuals reaching sexual maturity at around six months of age. This reproductive strategy, combined with a relatively short pelagic larval period, has contributed to its success as an invasive species. Encounters with this worm during dives may reveal its colorful crown, which can be an interesting sight among the substrate. While it is regarded as invasive in many areas, it poses no harm to humans. The conservation status of Branchiomma luctuosum is currently not evaluated.