Small-spotted Feather Duster, Notaulax punctulata
Small-spotted Feather Duster, Notaulax punctulata. Underwater photographs taken in Zihuatanejo Bay, Guerrero, March 2018. Photographs courtesy of Ron Woheau, Zihuatanejo. Identifications courtesy of Greg Timms, youtube.com/@CoralmasterdivesPuertoVallarta/videos.
Small-spotted Feather Duster, Notaulax punctulata Underwater photographs taken in Bahía de Banderas, Puerta Vallarta, Jalisco, July 2026. Photographs and identifications courtesy of Greg Timms, youtube.com/@CoralmasterdivesPuerto-Vallarta/videos.
Phylogeny: The Small-spotted Feather Duster, Notaulax punctulata (Tovar-Hernández, García-Garza & de León-González, 2020), is a member of the Sabellidae Family of Feather Duster Worms. The Notaulax Genus is one of forty-one genera in the Sabellidae Family, and there are twenty-three species in the Notaulax Genus. The genus name Notaulax comes from the Greek words meaning roughly “grooved back”, referring to the dorsal groove found in this genus. The species name punctulata is derived from the Latin word meaning ” having small spots or punctures” This refers to the presence of abdominal interramal eyespots of the species.
Morphology: The Small-spotted Feather Duster has a single, large crown of feathery tentacles called radioles. The radioles border the mouth. The radioles split cleanly into two symmetrical, non-spiraled, semicircular lobes that together form a near-perfect flat circle. The crown has 11 pairs of radioles that are approximately 4.9 mm in length. The Radiolar lobes fused dorsally by a palmate membrane, which is about one-half of the radiole length. Located just above this membrane is a group of 24 to 26 black ocelli (light detecting eyespots) in a single row on the outer sides of the radioles. The body of the worm is somewhat dorso-ventrally flattened at the thorax. The abdomen consists of 83 segments and differs from other species in this genus by the presence of interramal eyespots on the abdominal segments. The body is 15.5 mm (0.6 inches) in length and 1.5 mm (0.06 inches) in width. Small-spotted Feather Dusters encase themselves in a translucent tube, made of horn-like material.
Habitat and Distribution: Small-spotted Feather Dusters are found embedded in hard calcareous tubes on dead coral, rocky reef substrates, buoys, and dock pilings. They are normally found at depths up to 3 m (10 feet), though they may extend deeper. Small-spotted Feather Dusters are a Tropical Eastern Pacific species that are ENDEMIC to Mexican waters of the Pacific Ocean , where they have a very limited documented range being fund along the mainland coast, from Puerto Vallarta, Jalisco to Acapulco de Juárez, Guerrero.
Diet: Small-spotted Feather Dusters are suspension feeders, filtering plankton, micro algae and organic matter from the passing currents, or by creating currents by use of the radioles. Cilia on the radioles create a water current and push trapped food down specialized grooves toward the central mouth.
Predators: Small-spotted Feather Dusters have simple radiolar eyes (ocelli) on their crown that sense shadows and movement, allowing it to instantly retract from predators. While predators specific to Small-spotted Feather Dusters have not been well documented other similar species are preyed upon by crabs, gastropods, fish, sea stars and shrimp.
Reproduction: Small-spotted Feather Dusters are gonochoric (male or female for life). Sexual reproduction occurs through swarming, which occurs when females produce a pheromone attracting and signaling the males to shed sperm which in turn stimulates females to shed eggs. Fertilization is external. The fertilized eggs drift as plankton before settling to the bottom as trochophore larvae, which then metamorphose into adult worms.
Ecosystem Interactions: The Small-spotted Feather Duster is thought to be beneficial to nearby coral reef habitats by helping keep organic matter from smothering the coral polyps. Small marine invertebrates such as amphipods, bryozoans, and tiny crabs, often use the outside of the worms’ tubes for shelter and protection from predators, while not harming the worm. Small-spotted Feather Dusters sometimes build their tube on the outside of other animals, such as mollusk shells, which benefits the worm without harming the mollusk.
Human Interactions: Small-spotted Feather Dusters are biofoulers, meaning that they sometimes attach to buoys, docks, pilings, pipelines, and ship hulls. In sufficient numbers, they can have a negative impact on the performance of these items. They also occasionally attach to the shells of farmed shellfish, which lowers the value of the shellfish. From a conservation perspective, they have not been formally evaluated.
Synonyms: None