Eurycotis floridana
A large nocturnal cockroach that ranges across the damp terrestrial edges of miniBIOTA processing leaf litter and decaying plant matter, Florida Woods Cockroaches confirmed a second generation inside the closed system when a juvenile was observed in the Mangrove Forest in April 2026.
Florida Woods Cockroaches are large, slow-moving cockroaches that range across the damp terrestrial edges of miniBIOTA at night, processing leaf litter and decaying plant matter. They have been present since July 2025 and have successfully bred inside the closed system: a juvenile was confirmed in the Mangrove Forest in April 2026, marking the first second-generation individual of this species in miniBIOTA.
Eurycotis floridana is a large, dark reddish-brown cockroach, typically 30 to 40 mm long, native to Florida and the Gulf coastal states of the southeastern United States. It is closely associated with damp, humid terrestrial habitats: mangrove forests, live-oak hammocks, palmetto scrub, and moist shoreline edges. It shelters during daylight hours under bark, in leaf litter, in tree hollows, and within dense canopy vegetation, becoming active at night to forage across the ground and through low canopy.
Florida Woods Cockroaches are detritivores and scavengers. They feed primarily on dead and decaying plant matter, leaf litter, fallen fruit, bark, and woody organic debris. Their mouthparts are adapted to processing tough, fibrous plant material that most invertebrates cannot digest efficiently. They do not require standing water but require humid air and damp substrate to avoid desiccation.
The species has a strong chemical defense: glands at the rear of the abdomen produce a foul-smelling secretion used to deter predators. This may partially account for their relative persistence in a system with Red House Spiders and other potential predators. Reproduction occurs through ootheca (egg cases), which females carry then deposit in concealed locations. Each ootheca contains up to 22 eggs. Nymphs hatch after several weeks to months and develop through multiple instars before reaching adulthood. The species is cold-sensitive and can be stunned by temperatures approaching 50°F.
Florida Woods Cockroaches are detritus processors in the terrestrial realm. By consuming dead plant matter and leaf litter across the Mangrove Forest, Lakeshore, Lowland Meadow, and Marine Shore edges, they break down tough fibrous material that would otherwise accumulate. Their feeding activity and frass return organic material to the soil and litter layer, contributing to decomposition and nutrient recycling in the terrestrial food web.
In miniBIOTA, they also interact with the rain system infrastructure. Their movement across the atmosphere reservoir system in January and February 2026 was hypothesized to have contributed to triggering the first rain event in the sealed system, though this was not confirmed. Their presence inside the atmosphere tank was documented as a management concern, with cockroach waste entering rain lines posing a potential clogging risk.
Florida Woods Cockroaches are prey for Red House Spiders in miniBIOTA. A deceased individual was found in a Red House Spider web on April 22, 2026. They have also been observed cold-stunned at approximately 50°F without being taken by a nearby Humic Marsh Crab, suggesting predation risk depends on the predator involved.
Florida Woods Cockroaches were first introduced on July 6, 2025 and have been supplemented by additional introductions in 2025 and 2026. A juvenile was confirmed in April 2026.
July 6, 2025 (first introduction): Florida Woods Cockroaches introduced to miniBIOTA. The initial number is not recorded in the observation records; the October 2025 note implies approximately three individuals were present before that addition.
October 3, 2025: Five more Florida Woods Cockroaches were added to the system, bringing the estimated total population to eight.
January 24, 2026: A Florida Woods Cockroach was observed appearing to form an egg case in the Mangrove Forest biome, described as the first potential second-generation breeding event in miniBIOTA. Video evidence: short clip of the cockroach appearing to form an egg case in the top right corner of the Mangrove Forest.
January 28, 2026: A Florida Woods Cockroach was found residing in the atmosphere tank and defecating inside. The note flagged that waste was being carried into rain lines by rain events, posing a risk of gradual clogging. Video evidence: cockroach filmed from multiple angles in the atmosphere tank; accumulated waste near rainwater collection area.
February 2, 2026: A Florida Woods Cockroach was cold-stunned on the Mangrove Forest floor at approximately 50°F, barely moving after falling from a branch. A Humic Marsh Crab approached, foraged on detritus nearby, and passed the cockroach without interacting. Video evidence: approximately four minutes showing the cold-stunned cockroach, the crab approaching, foraging, and moving past without predation.
February 8, 2026: The first rain event in miniBIOTA since the system was fully sealed (day 13) was observed in the Mangrove Forest. The field note hypothesized that Florida Woods Cockroach mass on the suspended reservoirs may have pushed the third reservoir past its tipping threshold, triggering the second and first reservoirs in sequence. Video evidence: aftermath of the rain event; wet surfaces and evidence of multiple tipped reservoirs. Causation was not confirmed.
March 17, 2026: One adult Florida Woods Cockroach was added to the system. Estimated population now approximately three.
March 20, 2026: A Florida Woods Cockroach was observed in the Lowland Meadow with a bulbous yellow protrusion at the rear of its body, described as appearing consistent with a prolapse. Individual health and reproductive viability were flagged for monitoring. Video evidence: close-up of the individual.
April 12, 2026: One large adult Florida Woods Cockroach was added to the Lowland Meadow. If all previously observed individuals were still alive, estimated population now four.
April 22, 2026: A juvenile Florida Woods Cockroach was observed on a Mangrove Forest branch, described as evidence of a second generation emerging in miniBIOTA. A second individual was found deceased in a Red House Spider web, confirming active predation on this population. Video evidence: clips of the juvenile on a branch and the individual caught in a spider web.
June 14, 2026: One medium-sized Florida Woods Cockroach added to the Lowland Meadow. No behavioral observations at time of introduction. Part of the ongoing supplementation effort; population count uncertain due to unquantified predation losses since April 2026.
June 22, 2026: One deceased Florida Woods Cockroach found in the Mangrove Forest biome. Cause of death unknown; age, predation, and environmental conditions are all possible. Based on the most recent population count of four, the estimated population is now three. No media. Observation record, June 22, 2026.
Population has been supplemented through multiple intentional additions: July 2025 (initial), October 2025 (five more, total ~8), March 17, 2026 (one adult, ~3), April 12, 2026 (one adult, ~4). An egg case was observed forming January 24, 2026. A juvenile was confirmed in the Mangrove Forest on April 22, 2026, alongside a deceased adult found in a Red House Spider web. On June 14, 2026, one medium-sized individual was added to the Lowland Meadow, bringing the estimated count to four. On June 22, 2026, one deceased adult was found in the Mangrove Forest; cause of death unknown. Estimated population is now three.
Feeds primarily on dead and decaying plant matter, leaf litter, bark, and woody organic debris across the terrestrial biomes of miniBIOTA. Nocturnal foraging carries individuals across Mangrove Forest, Lowland Meadow, Lakeshore, and Marine Shore edges. Their frass and feeding activity return nutrients to the litter layer and soil, contributing to decomposition pathways in the closed system.
Requires warm, humid terrestrial conditions. Cold-sensitive: documented cold-stunned at approximately 50°F in miniBIOTA. Tolerant of tropical temperature swings in its normal range but not suited to prolonged cool conditions. Depends on damp substrate and high relative humidity rather than open water.
Egg case formation was observed in the Mangrove Forest on January 24, 2026 (video). A juvenile was directly confirmed on a Mangrove Forest branch on April 22, 2026 (video), representing the first second-generation individual of this species in miniBIOTA. Whether that juvenile has survived to adulthood is unconfirmed. Spider predation was also confirmed on the same date.
Processes dead and fibrous plant matter that accumulates in the leaf litter layer, returning organic material to decomposition pathways in the terrestrial realm. In miniBIOTA, their movement across the atmosphere reservoir system may also interact with the rain infrastructure, as cockroach weight on suspended reservoirs was hypothesized to have contributed to triggering the first rain event in the sealed system on February 8, 2026 (causation not confirmed).
Follow this species across the habitats where it currently appears in the miniBIOTA biosphere.
