Red Apple Crab — Metasesarma aubryi: Habitat and Care

Metasesarma aubryi is the accepted Red Apple or chameleon land crab; Sesarma (Holometopus) aubryi is an older combination. Colour can vary substantially. Primary material includes liver-red or brown shells, ochre margins and claws fading towards pale fingers, while females may be paler or mottled. Not every red terrestrial crab offered online is this species.

Museum accounts document a broad Indo-West Pacific island distribution, with New Caledonia as the type locality. Field material from western Java was found in litter and beneath logs near the coast. That is a different ecological starting point from the Javan freshwater Geosesarma sites, even though both can occupy a humid planted enclosure.

A 60 × 45 × 45 cm enclosure is a sensible planning example for an individual, not a proven minimum. Keep most of the floor terrestrial and usable. Increase space and provide separation before considering additional crabs; a trade claim of general peacefulness cannot guarantee safety during competition or moulting.

Leave several routes between shelter, food and water. Secure the lid, doors and cable openings because climbing can take place far above the substrate. Do not mix Red Apple with vampire crabs, frogs, geckos or aquatic animals simply to make the scene more lively. Each setup should have an identified animal-care purpose rather than a list of decorative inhabitants.

A moderate captive starting range around 22–26°C and relative humidity commonly around 70–90% fits available care accounts without treating their broad values as laboratory optima. Measure at the ground and inside the usable refuge zone. A warm room and wet glass can still conceal a dry burrow.

Mist and water the substrate selectively, maintaining ventilation and a less-wet exposed surface. Do not bake the floor with uncontrolled bottom heat or fill the drainage reservoir until it contacts the soil. Shaded planted cover and a regular daylight cycle allow the crab to choose where it rests. Guard any heater and check conditions during warm weather, not only at the morning inspection.

Provide clean shallow water that the crab can enter and leave easily, with slopes rather than a smooth steep wall. Condition the water appropriately and clean the basin promptly when fouled. Freshwater access is used in terrestrial captive practice; follow a documented source history when assessing an individual rather than making sudden salinity changes from a generic land-crab sheet.

The reviewed evidence does not establish a universal numerical adult salinity target. Field observations of females migrating towards the sea to release larvae show a reproductive connection, not that adult burrows should be flooded with marine water. Do not apply Red Claw salinity or a hermit-crab two-bowl formula as if either had been tested for all M. aubryi. Document the uncertainty instead of disguising it with a precise invented number.

Keep more than one retreat per crab and avoid forcing animals to share a narrow doorway or the only food dish. Monitor for persistent pursuit, damaged limbs or one animal excluded from water. If a group cannot be observed and separated, individual housing is the more manageable choice.

A moulting animal may remain concealed and stop feeding. Do not dig it up repeatedly or pull at the old shell. Check that the retreat remains moist, oxygenated and undisturbed. An uncontaminated shed can be recycled once safely abandoned if it is not fouling the system. Repeated failures require a review of moisture, nutrition, contamination and conflict, not an automatic change to salt water.

Scientific observations from Taiwan record egg-bearing M. aubryi participating in coastal larval-release migration. The evidence supports a dispersing larval phase rather than the direct development seen in many terrestrial Geosesarma. Keep that distinction even when a seller loosely calls every small land crab a vampire crab.

A complete verified home rearing protocol is not established in the sources reviewed. Do not promise success in the adult freshwater dish or prescribe a particular larval salinity, light schedule or food solely from another sesarmid species. Eggs or a release event do not demonstrate a captive generation raised to adulthood. Any breeding project needs separately documented larval housing, nutrition and transition to land.

Use the Naturalistic Terrarium World for the sheltered ground and service routes, adapting the Tropical Leaf-Litter Vivarium for deeper burrowing substrate and safe water access. Do not transplant a dry-scrub scene or an inaccessible decorative waterfall. The enclosure should still permit cleaning when roots and plants have matured.

A Leaf Litter & Substrate Variety Mix can offer components to inspect individually; it is not a complete species-certified burrowing mix. Select suitable material and leave adequate fine moist substrate beneath it. Avoid tight pods, sharp edges and dense inaccessible heaps. The most useful purchase is one that improves a real shelter or maintenance need, not simply another ornament.

Inspect moisture, water access, food remains and enclosure security daily. Remove spoiled food from retreats during appropriate maintenance and replace disintegrating litter gradually. A bioactive system assists processing but does not make a buried food cache harmless or remove the need to check drainage.

Ask for the scientific identity, collection or breeding origin and the conditions in which the animal has actually been maintained. Keep new arrivals separately with dedicated tools and observe feeding before mixing any conspecifics. A seller’s colour name is not a breeding record. Never release unwanted animals or enclosure water into the wild. BBA sells habitat materials, not the crabs described in this guide. For appetite loss, check burrow moisture, temperature, recent feeding and social pressure before intervening. Seek appropriate professional advice for progressive weakness or repeated deaths. The uncertainty around complete larval rearing is retained openly rather than replaced with a false breeding guarantee.