Coenobita clypeatus
(Fabricius, 1787)
Caribbean Land Hermit Crab, Soldier Crab, West Atlantic Crab, Tree Crab, Purple Pincher
Coenobita clypeatus is a terrestrial hermit crab native to the western Atlantic and Caribbean region. inhabit coastal environments and can be found considerable distances inland, often burrowing under tree roots. The exhibits complex social including shell fighting, vacancy chains for resource acquisition, and size-dependent . It relies on scavenged gastropod shells for protection and water retention, with shell availability directly limiting and individual growth.
Pronunciation
How to pronounce Coenobita clypeatus: /siːnəˈbaɪtə klɪˈpiːətəs/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
Distinguished from other Coenobita by the combination of: pronounced purple coloration on right chela and legs; strong left chela dominance in heterochely; western Atlantic/Caribbean distribution. Distinguished from marine hermit crabs by terrestrial use, modified gills for air breathing, and dependence on shell water for . Shell-carrying and crab-like form distinguish from other terrestrial crustaceans.
Images
Habitat
Terrestrial coastal environments including coral reef islands, rocky shorelines, and vegetated inland areas. Found under roots of large trees and in burrows. Requires access to shoreline for shell acquisition and larval development. High intertidal and supratidal zones provide critical gastropod shell resources.
Distribution
Western Atlantic Ocean: Bahamas, Belize, southern Florida, Venezuela, Virgin Islands, West Indies, Curaçao, southern Gulf of Mexico. Distribution limited by availability of suitable gastropod shells and terrestrial microhabitats.
Seasonality
Activity patterns influenced by moisture availability and temperature. associated with documented in Curaçao . Seasonal abundance variations observed with higher densities in some sampling periods.
Life Cycle
Development includes planktonic larval stages (glaucothoe) requiring marine environment, followed by settlement and adoption of first gastropod shell. Heterochely appears triggered during glaucothoe and stages. Ovigerous females segregate from main to seek suitable deposition areas. Water loss minimized by shell protection (0.08% body weight per hour).
Behavior
Exhibits complex shell-related social : shell fighting involving ritualized combat with cheliped movements, rotating attacks, and chirping sounds by defenders; vacancy chains where sequential shell exchanges distribute resources across multiple individuals. Anti- escape behavior shows and dishabituation via auditory stimulation. Aggregates in preferred microhabitats with size-dependent . Strong behavioral responses to volatile odors; aerial olfaction used to locate food sources.
Ecological Role
Potential importance in insular given high densities (up to 46 individuals per m² vegetated area). Facilitates nutrient cycling through scavenging. Creates for associated organisms; documented association with Cryptopygus springtails in Mexico. Shell vacancy chains generate aggregate benefits distributed across .
Human Relevance
Occasionally kept as pet; collected for aquarium trade. Subject of ecological and behavioral research. Presence indicates healthy coastal with adequate shell resources.
Similar Taxa
- Coenobita compressus (Ecuadorian hermit crab)Overlapping distribution in some regions; distinguished by less pronounced chela asymmetry and different coloration patterns.
- Marine hermit crabs (Paguridae)Similar shell-using but distinguished by fully marine , different respiratory adaptations, and lack of terrestrial behavior.
More Details
Respiratory Adaptations
Modified scaphognathite pumping for air breathing; large increase in ventilatory frequency in response to hypoxia and wetting. Haemocyanin with high oxygen affinity (P50 = 10 torr at 23°C) and 60-80% saturation enables adequate tissue oxygen delivery despite low haemolymph oxygen tensions. Temperature and pH sensitivity of oxygen affinity lower than marine and littoral .
Water Economy
Shell water critical for and gill function. High bicarbonate and non-bicarbonate buffering capacities. Lower water loss rate than other terrestrial crustaceans due to shell protection.
Sensory Biology
Well-developed aerial olfaction with organized primary olfactory centers (olfactory lobes) in brain. Orcokinin neuropeptide present in olfactory and local , suggesting lateral inhibition across olfactory glomeruli. Visual abilities demonstrated through behavioral studies.
Sources and further reading
- BugGuide
- GBIF taxonomy match
- iNaturalist taxon
- NCBI Taxonomy
- Catalogue of Life
- Bembicid Holdings | Entomology Research Museum
- On the Ecology of Coenobita Clypeatus in Curaçao
- Auditory stimulation dishabituates anti-predator escape behavior in hermit crabs (Coenobita clypeatus)
- Observations on the Social Behavior of the Land Hermit Crab, Coenobita Clypeatus (Herbst)
- Vacancy Chains Provide Aggregate Benefits To Coenobita clypeatus Hermit Crabs
- Behavioral evidence illuminating the visual abilities of the terrestrial Caribbean hermit crab Coenobita clypeatus
- A new Mexican species of the Cryptopygus complex (Collembola, Isotomidae) associated with the hermit crab Coenobita clypeatus (Crustacea, Coenobitidae)
- Respiration and Adaptation to the Terrestrial Habitat in the Land Hermit Crab Coenobita Clypeatus
- Relative Growth of the Land Hermit Crab, Coenobita Clypeatus (Anomura, Coenobitidae) from a Coral Reef Island, Southern Gulf of Mexico
- Land hermit crab (Coenobita clypeatus) densities and patterns of gastropod shell use on small Bahamian islands
- Functional morphology of the primary olfactory centers in the brain of the hermit crab Coenobita clypeatus (Anomala, Coenobitidae)