Erichsonella attenuata
Eelgrass Isopod
A slender, camouflaged isopod that clings to seagrass blades, feeding on algae and detritus while hiding from predators.
- Common Name
- Eelgrass Isopod
- Scientific Name
- Erichsonella attenuata
- Realm
- Saltwater
- Biome
- Seagrass Meadow
- Introduction Method
- Introduced alongside shoal grass plantings as part of the marine macroinvertebrate seeding.
- Current Estimated Population
- At least one observed individual; broader abundance is unconfirmed.
- Population Status
- Uncertain
- Carrying Capacity Status
- Under Evaluation
- Date Last Observed
- June 10, 2026
Section Notes
Two dead Eelgrass Isopods were observed being consumed by Daggerblade Grass Shrimp in the Seagrass Meadow, confirming their role as animal biomass in the food web while leaving the cause of death unknown.
- Trophic Level
- Primary Consumer
- Feeding Niche / Method
- Grazer of algae
- Dietary Inputs
- Algae, biofilm, microbial films, and soft surface growth
- Known Predators
- Sea Anemones (e.g., family Diadumenidae - directly observed consuming an isopod on 2026-03-21), small marine fish, crabs.
Section Notes
Trophic classification is Primary Consumer. Food-web role: Algae and biofilm grazer. Feeding method: Grazer of algae. Dietary inputs: Algae, biofilm, microbial films, and soft surface growth
- Temperature Range
- Subtropical (typically 68°F to 85°F / 20°C to 30°C)
- pH Range
- Standard Marine (typically pH 7.8 to 8.4)
- Lighting Requirements
- Moderate to High (adapted to sunlit shallow seagrass beds)
- Flow / Aeration Preference
- Low to Moderate flow (prefers sheltered grass beds where water currents are buffered)
Section Notes
Adapted to shallow estuarine seagrass beds. Highly dependent on stable salinity and dissolved oxygen levels. Relies on the structural shelter of seagrass blades to escape visual predators.
- Expected Lifespan
- Under 1 year (typically 6–9 months)
- Reproductive Strategy
- Continuous reproduction with direct development within a marsupium (brood pouch); no planktonic larval stage.
- System Reproduction Status
- Not confirmed; no reproduction claim is made from the current reviewed evidence.
- Growth Rate
- Fast (rapid juvenile growth through frequent molting)
Section Notes
Exhibits a continuous breeding cycle throughout the year, with oocyte maturation occurring continuously. Eggs are spawned into a ventral brood pouch (marsupium) on the female. Embryos develop directly within the pouch, eventually emerging as fully formed juvenile crawls (mancae), bypassing any planktonic stages.
- Ecological Role
- Algae control
- Symbiotic Relationships
- Commensal relation with shoalgrass and manatee grass, seeking physical protection on their blades while cleaning them by grazing epiphytic microalgae.
- Microhabitat Preference
- Shoalgrass blades, macroalgae clumps, and silty benthic organic material.
Section Notes
Serves as an essential link in the Seagrass Meadow food web by consuming microalgal epiphytes and biofilms on seagrass blades. This grazing helps prevent epiphytic overgrowth, ensuring the grass blades receive sufficient light for photosynthesis, while the isopod itself serves as a key protein source for small carnivores.
Biomes This Species Lives In
Follow this species across the habitats where it currently appears in the miniBIOTA biosphere.
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No Records Yet
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