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ArtistStudio like natural history portrait of Perbrinckia enodis half-emerged on a streamside root mat, water flowing softly behind. Composition: square macro with crab centered and leaf-litter texture surrounding. Lighting: mottled canopy light with warm key to show shell texture and wet highlights. Palette: rusty-brown carapace, golden leaf litter, jade water. Texture & detail: shell striations, leg setae, sediment grains. Artist-mix: Audubon-like detail , Opie documentary sensibility. Camera: macro 100mm with stacking; output 4k. Variations: microhabitat collage and “before/after” stream restoration diptych.
**Red-fin Crab
Scientific name: Perbrinckia enodis
Article (short):
Perbrinckia crabs are a group of tiny stream specialists and P. enodis lives only where cool forest streams run clear. Their small size belies a big role: they shred leaf litter, keep streams flowing, and support fish and insect life - and their survival is threatened as streams get diverted and forests are cleared.
Quick facts
Status (approx.): Critically Endangered / micro-endemic (many Perbrinckia species are CR).
Range: Select freshwater streams in Sri Lanka (very local).
Habitat: Shallow, shaded stream margins and seepage rocks.
Diet: Detritus, algae, small invertebrates.
Lifespan: Several years typical for small freshwater crabs.
Reproduction: Brooded eggs; juveniles require clean, oxygenated water.
Ecological role: Key detritivores, supporting nutrient cycling and stream clarity.
Main threats: Water pollution, stream alteration, forest clearance.