Common Rough Woodlouse vs Komodo Dragon

Porcellio scaber compared with Varanus komodoensis

Key Differences

Common Rough Woodlouse is Least Concern while Komodo Dragon is Endangered.

Taxonomic Classification

Rank	Common Rough Woodlouse	Komodo Dragon
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Arthropoda (Arthropods)	Chordata (Chordates)
Class	Malacostraca (Crustaceans)	Reptilia (Reptiles)
Order	Isopoda (Isopoda)	Squamata (Lizards & Snakes)
Family	Porcellionidae	Varanidae (Monitor Lizards)
Genus	Porcellio	Varanus (Monitor Lizards)
Species	Porcellio scaber	Varanus komodoensis

Evolutionary Relationship

Common Rough Woodlouse and Komodo Dragon share a common ancestor at the Kingdom level: Animalia. (Animals)

View Kingdom: Animalia

Conservation Status

Common Rough Woodlouse

LC — Least Concern

Komodo Dragon

EN — Endangered

Population: ~3.5K

Trend: Stable →

Physical Characteristics

Attribute	Common Rough Woodlouse	Komodo Dragon
Diet	—	Carnivore
Average Lifespan	—	30 years
Average Length	—	2.6 m
Average Weight	—	70.0 kg

Habitat & Geographic Range

Common Rough Woodlouse

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and deserts and xeric shrublands within the Indomalayan biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Africa (South Africa), Asia (Japan, Sri Lanka), Europe (5 countries), North America (United States), and South America (Brazil).

Komodo Dragon

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and tropical and subtropical grasslands and savannas, among 4 distinct biome types spanning the Australasia and Indomalayan realms. Populations are also found in montane and highland environments at higher elevations.

Range

Found in Indonesia. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Common Rough Woodlouse

<em>Porcellio scaber</em>, the common rough woodlouse, is a terrestrial isopod crustacean in the family Porcellionidae. One of the most widespread and abundant woodlouse species in the world, it has established itself across Europe, the Americas, Asia, Australia, and numerous oceanic islands, including populations documented in Belgium, Brazil, Denmark, Japan, and Norway. This synanthropic species typically inhabits decaying leaf litter, rotting wood, compost heaps, under stones, and in the soil of gardens, forests, and human-modified landscapes. It thrives in moist, sheltered microhabitats and shows some tolerance for drier conditions compared to related species. As a detritivore, the common rough woodlouse feeds primarily on decaying organic matter including leaf litter, rotting wood, fungi, and plant debris, playing a significant role in nutrient cycling and decomposition processes. The species reproduces sexually, with females brooding eggs and juveniles in a specialized brood pouch. Assessed as Least Concern by the IUCN, its cosmopolitan distribution and high adaptability make it one of the most ecologically resilient terrestrial isopods. It is easily identified by its rough, grey to dark brown dorsal surface with pale lateral markings. Biological traits such as average lifespan and typical body length remain variable across populations and are not uniformly documented in standardized databases.