Melampus bidentatus

Eastern Melampus

The Eastern Melampus is a small air-breathing snail native to Atlantic and Gulf coast salt marshes, living at the boundary between land and water. Two individuals were introduced to the Marine Shore biome in April 2026, wild-collected from a brackish tidal ditch in Spring Hill, Florida.

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Identity & Origin +

Common Name: Eastern Melampus
Scientific Name: Melampus bidentatus
Realm: Terrestrial
Biome: Marine Shore
Introduction Method: Intentional Seeding
Date First Introduced: April 23, 2026
Source / Origin: Wild brackish tidal ditch, Spring Hill, FL

Population Dynamics +

Current Estimated Population: 2
Population Status: Uncertain
Carrying Capacity Status: Unknown. System capacity not yet established. Population is at minimum viable number.
Date Last Observed: April 29, 2026

Section Notes

Two individuals introduced April 2026. Immediate feeding behavior on day of introduction is a strong positive indicator. Monitoring for long-term survival and reproduction.

Trophic Ecology +

Trophic Level: Detritivore
Feeding Niche / Method: Radula grazing, using a rasping tongue-like structure to scrape and consume decaying plant material from surfaces at the waterline.
Dietary Inputs: Dead grass detritus, decaying coastal vegetation
Known Predators: No confirmed predators within the Marine Shore biome. The Gulf marsh crab is a possible predator given its omnivorous nature, but this has not been observed.

Section Notes

Immediately observed feeding on dead grass detritus on the day of introduction (2026-04-23). Strong early establishment indicator.

Environmental Tolerances +

Section Notes

Found naturally in high intertidal and upper salt marsh zones along the Atlantic and Gulf coasts. Tolerates a wide salinity range from brackish to full marine. Air-breathing pulmonate, survives extended periods out of water, which is fundamental to its intertidal lifestyle. Collected from a brackish tidal ditch in Spring Hill, FL, indicating strong tolerance for reduced salinity.

Life Cycle & Reproduction +

Expected Lifespan: 1 to 2 years in natural populations
Reproductive Strategy: Spawning timed to spring tides, the highest monthly tidal events. Egg masses are deposited on vegetation just above the waterline. Larvae pass through a brief planktonic veliger stage before settling to the substrate.
System Reproduction Status: Not yet observed. Monitoring for spawning behavior linked to tidal simulation cycles.

Section Notes

Reproduction is tightly synchronized with lunar and tidal cycles. Spawning occurs in response to the highest monthly tides, with egg masses laid on intertidal vegetation just above the waterline. Larvae are briefly planktonic in the veliger stage before settling. In the miniBIOTA system, two individuals are present as of April 2026 and reproduction has not yet been observed. The tidal simulation in the biome may influence spawning timing.

Ecological Role & Symbiosis +

Ecological Role: Detritivore and nutrient transporter. Tracks low tide to collect nutrients at the waterline and carries those nutrients back onto land through droppings. Key function in the Marine Shore biome: moving marine-derived nutrients to the terrestrial side.
Microhabitat Preference: Waterline and lower intertidal. Tracks low tide and moves with the tide at the land/water boundary.

Section Notes

The Eastern Melampus plays a dual role as a detritivore and nutrient transporter. By feeding at the waterline during low tide and returning to land, it moves marine-derived nutrients back into the terrestrial zone through its droppings. In natural salt marsh systems this species can reach very high population densities and is a key driver of coastal nutrient cycling. No symbiotic relationships documented in the miniBIOTA system.

Marine/Saltwater

A sandy, limestone shoreline where beach grasses, fiddler crabs, and shoal grass coexist in brackish water, a mixture of freshwater and marine waters.

April 29, 2026 Observation Video