Porcellio pumicatus

🔤 Taxonomy

Porcellio pumicatus Budde-Lund, 1885 is accepted by the World List of Isopoda and GBIF. Older synonyms include Porcellio verhoeffi, P. strandi, and P. orarum verhoeffi. Because this uncommon species has little presence in the hobby, preserve the original identification and source rather than assigning a trade morph name.

📌 Description

Adults reach about 1.2-1.5 cm. Published faunal summaries describe a ground-dwelling species encountered beneath stones; it cannot roll into a ball. Reliable species-specific captive trials are scarce, so the parameters below are conservative starting ranges based on its central Italian and Sardinian ecology and standard Porcellio biology.

This uncertainty makes it an intermediate species even though the physical setup is simple. Change one variable at a time and keep written observations rather than treating an unverified care post as a fixed prescription.

🌍 Distribution

The documented range is central mainland Italy and Sardinia. The country-level map cannot show that separation and must not be read as evidence that the species occurs throughout Italy.

Country-level native range of Porcellio pumicatus

⚖️ Legal status

Checked on 2026-08-29: P. pumicatus was not found in the CITES Appendices, EU wildlife-trade Annexes A-D under Regulation (EU) 2026/1383, or Bern Convention Appendices II-III. Italian and Sardinian protected-area, collection, transport, sale, and export rules remain separate and may protect sites or native fauna without naming the species in those international lists.

Use documented captive-bred stock and retain invoices and breeder details. Do not collect under stones in the wild, release cultures, or discard live substrate outdoors.

🤌 Husbandry

Start a small colony in at least 25 × 20 × 15 cm, with fine cross-ventilation. Keep about one-third of the floor damp and allow the opposite surface to dry. Flat bark and securely placed stone-like cover should span the gradient.

Parameter	Conservative starting target
Adult length	1.2-1.5 cm
Temperature	16-25 °C
Moisture	one-third damp, remainder ventilated and drier
Substrate	5-7 cm, leaf-rich and mineral-bearing
Staples	leaves, rotten hardwood, calcium
Evidence level	limited species-specific captive data

Quarantine for 60 days with separate tools and retain the source label. A culture sold only under a photograph should be treated as identification-uncertain.

💡 Lighting

UVB is not required. Provide 10-12 hours of diffuse light and shaded retreats. Prevent direct sunlight from striking the container.

🌡 Heating and temperature

Use 16-25 °C as a cautious range, with a 14-20 °C retreat and cool nights. Do not assume that Sardinian origin means constant high heat; under-stone microhabitats can remain much cooler than exposed air.

Heat one side wall with a thermostat only if necessary. Avoid base heating and sustained temperatures above 27 °C.

💧 Humidity and water

Maintain damp lower substrate and moss at one end, with a dry surface option and steady airflow. An overall 50-70% RH trend is less important than the condition beneath the refuge. Add water to the substrate rather than misting every surface.

A water dish is unnecessary. Condensation and sour odour indicate excessive water or inadequate ventilation; dry moss and moulting failures indicate an unstable hydration zone.

🌿 Enclosure and decoration

Use 5-7 cm of pesticide-free topsoil or leaf soil mixed with deciduous leaf mould, rotten hardwood, and crushed limestone. Add abundant leaves, thin cork, moss at the damp end, and securely seated flat stone or bark.

Offer cuttlebone or calcium carbonate continuously. Avoid pure coconut fibre, aromatic conifer material, fertilizers, treated wood, and unsupported heavy décor.

🪳 Feeding

Keep deciduous leaves and soft rotten hardwood available at all times. Every three to five days provide a small amount of squash, carrot, mushroom, dried greens, or complete isopod food. Offer a small protein portion once weekly and reduce it if consumption is slow.

Place food on bark or a dry leaf and remove wet remains within 24-48 hours. Sparse species-specific data argue for measured portions and records, not aggressive feeding.

🥚 Breeding

As in other terrestrial isopods, females retain eggs and embryos in a ventral marsupium and release mancae. The repository records this reproductive mode as viviparous; there are no exposed eggs to incubate.

Species-specific clutch and maturity data were not located. Maintain stable conditions, calcium, mature mixed-sex stock, and several juvenile size classes before splitting the culture.

🩺 Common problems

Colony declines after a setup change: restore the prior moisture and temperature and stop disturbing hides.
Failed moults: check deep moisture and continuous calcium.
Mold or mites: reduce supplements and improve cross-ventilation.
Crushing injuries: seat stones on the floor before adding substrate.
Uncertain identity: preserve the seller label and seek adult taxonomic examination.

📌 Conclusion

P. pumicatus should be kept as a documented observation colony, not as an “easy” generic isopod. A cool gradient, secure cover, edible substrate, and careful records are more defensible than precise claims unsupported by species-level captive studies.