Cirratulidae sp. (unidentified)
A sediment-dwelling polychaete that extends long pale tentacles outward from its burrow to gather fine organic particles from the sand surface, now established with more than 100 individuals across the Seagrass Meadow and Marine Shore.
The Spaghetti Worm (Cirratulidae sp., unidentified) is the common red cirratulid polychaete deposit feeder established in the miniBIOTA Seagrass Meadow and Marine Shore. It arrived as a hitchhiker on November 11, 2024, and expanded rapidly to an estimated 115 individuals now occupying much of the available substrate. Reproduction is confirmed from the population trajectory. The species is the most numerically abundant benthic invertebrate on record in the saltwater biomes and has been observed climbing the glass during a sediment stress event in May 2026. Its identity is family-level only. It is not Timarete punctata: on October 15, 2026 Josue identified T. punctata as the rarer yellow worm with black-banded tentacles, recorded as Hair Worm.
Cirratulid polychaetes are distributed across subtropical and tropical marine environments, including the Gulf of Mexico and Florida's coastal estuaries, bays, and intertidal zones. They are common constituents of soft-sediment marine communities and are frequently found in seagrass beds, sandy to silty substrate near oyster clusters, and in the fouling communities on marina structures. Their presence in miniBIOTA is consistent with normal Florida saltwater invertebrate diversity.
Cirratulid polychaetes live buried in soft sediment and extend long, thread-like feeding tentacles and gill filaments outward across the surface. In miniBIOTA, spaghetti worms occupy soft sediment in the Seagrass Meadow and Marine Shore. As of June 4, 2026, an observer noted that the large population occupies much of the substrate in the Seagrass Meadow. The worms live in fixed positions and are visible primarily as networks of pale, thin tentacles extending across the sand.
Cirratulid polychaetes are deposit feeders. They extend long grooved feeding tentacles from the burrow across the sediment surface, gathering fine organic particles, bacteria, detritus, and diatoms, which cilia carry along the grooves toward the mouth. The worm does not filter open water; it harvests material already deposited on or settling near the substrate surface. In miniBIOTA, feeding behavior is inferred from species biology and deposit-feeder classification; feeding in miniBIOTA has not been seen directly.
Cirratulid polychaetes reproduce sexually, typically by releasing eggs and sperm into the water; some species also reproduce asexually by fragmentation. In miniBIOTA, population growth suggests reproduction: the species arrived as a small hitchhiker introduction in November 2024 and has grown to an estimated 115 individuals. The exact timing, frequency, and conditions of individual breeding events have not been documented.
Cirratulid polychaetes tolerate the range of temperatures, salinities, and water quality conditions typical of subtropical estuarine environments. In miniBIOTA, the population has established and grown without any documented tolerance-related failures. The May 16, 2026 observation of worms climbing the glass above a benthic cloud formation suggested possible sensitivity to reduced oxygen or sediment disturbance near the substrate; worms moved upward from the affected area, though no mortality was confirmed.
Spaghetti worms are sediment recyclers in the Seagrass Meadow and Marine Shore. By gathering fine organic particles from the substrate surface and depositing processed material as feces back into the sediment, they contribute to benthic nutrient cycling and help turn over the upper sediment layer. With an estimated 115 individuals at carrying capacity, they represent the dominant benthic invertebrate by numerical abundance in the saltwater biomes, making their deposit-feeding activity a significant contributor to local sediment processing.
Their behavioral response to the May 2026 benthic cloud event (climbing the tank glass) provides a potential observational indicator of low-oxygen conditions or sediment disturbance at the substrate level. This warning-signal function was noted in miniBIOTA; it has been observed once and has not been systematically tested.
The June 4, 2026 mud crab introduction was motivated in part by the potential for mud crabs to influence the large spaghetti worm population through digging and substrate disturbance; no confirmed effect has been documented since.
Red cirratulid worms arrived as hitchhikers November 11, 2024 and spread through Seagrass Meadow and Marine Shore. The standing estimate is 115 individuals; growth from the small founding population suggests reproduction, though no individual spawning event has been confirmed.
Hitchhikers from November 11, 2024 established across Seagrass Meadow and Marine Shore. The standing estimate is 115 individuals, with reproduction inferred from population growth. In January 2026, abundance was described qualitatively as hundreds. A few were visible January 29, without mass glass climbing during several days of closure. On May 16 worms climbed above a white cloud near the bottom, possibly responding to low oxygen or sediment disturbance. They occupied much of the substrate June 4; whether Mud Crabs changed their abundance is unknown.
A cirratulid deposit feeder that extends long grooved feeding tentacles from its burrow across the sediment surface to gather fine organic particles, bacteria, detritus, and diatoms, which cilia carry along the grooves toward the mouth. The worm does not filter open water; it harvests material already deposited on or near the substrate. In miniBIOTA, feeding is inferred from species biology and deposit-feeder classification; no direct feeding observations have been recorded.
These cirratulids live in subtropical marine sediment. Upward movement on glass may reflect low oxygen or sediment disturbance, as during the May 16, 2026 cloud event. The behavior has not been compared with dissolved-oxygen readings, and its absence does not establish safe oxygen levels.
Reproduction in miniBIOTA is confirmed from the population trajectory: the species arrived as a small hitchhiker in November 2024 and grew to an estimated 115 individuals. The exact timing and frequency of breeding events has not been directly documented. Successful reproduction requires both sexes releasing gametes into the water column simultaneously; with a population of 115 individuals, this condition is readily met.
Spaghetti worms serve as sediment recyclers in the Seagrass Meadow and Marine Shore, gathering surface detritus and depositing processed material as feces back into the substrate. With an estimated 115 individuals at carrying capacity, they represent the dominant benthic invertebrate by numerical abundance in the saltwater biomes. Glass-climbing behavior observed in May 2026 may provide an observational indicator of benthic oxygen or sediment conditions.
Clean-up Crew
Follow this species across the habitats where it currently appears in the miniBIOTA biosphere.
Viewer help narrowed the mystery worm swarm to spaghetti worms, and the colony had already reproduced widely through the marine sand. Their buried feeding...
Clip of a clump of spaghetti worms that came out of the substrate due to a low oxygen situation in the Seagrass Meadow.
