Astraea sp. (unidentified)
Brought in as a same-day replacement after a stocking mistake, this star-shelled grazer was chosen for its Florida pedigree to take on the algae buildup that the Seagrass Meadow's older cleanup crew could no longer keep up with.
Six Astraea Snails (genus Astraea/Lithopoma, species unidentified) were purchased from a local saltwater aquarium store and introduced to miniBIOTA's Seagrass Meadow on August 1, 2026, replacing the margarita snails that had been introduced the day before and then identified as a cold-water species unsuited to the biome. Five of the six margarita snails were located and removed that same day; the sixth could not be found and remains a separate, tracked record. Astraea was selected specifically because it is associated with Florida and expected to tolerate Seagrass Meadow conditions, targeting the same documented hard-surface algae shortfall that motivated the Chestnut Turban Snail introduction one day earlier. Six more were added on August 28, 2026 to intensify grazing pressure, bringing the cumulative number introduced to twelve, though the living population is not confirmed at that level. On September 1, 2026, one individual was confirmed dead after roughly two days overturned and unable to right itself, lowering the maximum possible living population to eleven.
Family note: Astraea snails (genera Astraea and Lithopoma) belong to family Turbinidae, the same family as Turbo snails (Mexican Turbo Snail, Chestnut Turban Snail, both also in miniBIOTA), but are a distinct lineage with a characteristic star-shaped, flattened-spire shell rather than the rounder Turbo shell form.
Astraea snails in the aquarium trade are most often collected from Florida and Caribbean waters, where they inhabit hard substrate in shallow marine environments. This Florida association was the specific reason Josue selected the species as a replacement for the misidentified, cold-water-adapted margarita snails.
Astraea snails are marine grazers of hard substrate: rock, shell, glass, and other illuminated surfaces in shallow tropical and subtropical waters. In miniBIOTA, they were placed in the Seagrass Meadow.
Astraea snails are herbivorous grazers, using a radula to rasp algae, diatoms, and biofilm from hard surfaces, broadly similar in feeding mode to Turbo species. No direct feeding observation has yet been made in miniBIOTA.
Astraea and Lithopoma species, like other Turbinidae, are understood to be broadcast spawners with planktonic larval development, though this has not been specifically confirmed for the unidentified species in miniBIOTA. In a closed system, planktonic-larvae recruitment is not expected; any Astraea Snail in miniBIOTA should be treated as a consumable grazer requiring periodic restocking pending further information.
Requires full to near-full marine salinity and tropical to subtropical water temperatures consistent with a Florida/Caribbean hard-substrate habitat. Specific tolerance measurements for miniBIOTA conditions have not been taken.
Astraea Snail was introduced as a targeted response to the Seagrass Meadow's documented hard-surface grazing shortfall: three of the biome's four glass panes were fully algae-covered as of July 29, 2026. Introduced one day after the Chestnut Turban Snails and as a direct replacement for the misidentified margarita snails (five of which were removed the same day; a sixth remained unlocated), it is the second of two concurrent, unevaluated attempts to restore grazing capacity lost with the decline of the Lightning Nerite, both cerith species, and the presumed loss of Mexican Turbo Snail.
Six Astraea Snails were purchased from a local saltwater aquarium store on August 1, 2026, to replace the margarita snails introduced July 31, 2026, after they were identified as a cold-water Pacific species unsuited to the Seagrass Meadow. Five of the six margarita snails were removed the same day the Astraea Snails arrived; the sixth could not be located and is tracked as a separate record.
Six individuals purchased and introduced August 1, 2026, replacing the removed margarita snails. On August 18, 2026, at least five were confirmed present and actively grazing, producing visibly cleaned areas on the glass, though algae regrowth outpaces their coverage of the full surface. The sixth individual has not been counted alongside the others but is not confirmed lost. Six additional individuals were introduced August 28, 2026 to intensify algae grazing, bringing the cumulative total introduced to twelve without establishing a living population at that level. On August 29, 2026, most locatable individuals were healthy and Astraea Snail mortality was largely ruled out as the source of a concurrent saltwater water-quality disturbance (a partial Caulerpa die-off). On September 1, 2026, one individual was confirmed dead after roughly two days overturned and unable to self-right; prolonged overturning is the leading suspected contributing factor, with possible additional stress from Florida Glass Shrimp picking at the still-living snail (unconfirmed). Florida Glass Shrimp are scavenging the remains. Maximum possible living population is now eleven of twelve.
Herbivorous surface grazer, introduced specifically to address the Seagrass Meadow's hard-surface grazing shortfall. Confirmed August 18, 2026: at least five individuals actively grazing glass algae, producing visibly cleaned areas, though regrowth outpaces the group's coverage of the full surface.
Full to near-full marine salinity required; sourced as a Florida/Caribbean species expected to be better suited to Seagrass Meadow conditions than the removed cold-water margarita snails. Specific tolerance ranges for miniBIOTA conditions not formally measured.
No reproductive observations in miniBIOTA. If broadcast spawning with planktonic larvae applies, recruitment cannot complete in a closed system; treat as a consumable grazer pending further information.
Introduced alongside Chestnut Turban Snail as one of two concurrent, unevaluated attempts to restore hard-surface grazing lost with the decline of Lightning Nerite, both cerith species, and Mexican Turbo Snail.
Algae and biofilm grazing
Follow this species across the habitats where it currently appears in the miniBIOTA biosphere.
