Arizona madrone vs Common Nut Clam

Arbutus arizonica compared with Nuculana pernula

Key Differences

• Arizona madrone is Least Concern while Common Nut Clam is Vulnerable.

Taxonomic Classification

Rank	Arizona madrone	Common Nut Clam
Kingdom	Plantae (Plants)	Animalia (Animals)
Phylum	Magnoliophyta (Flowering Plants)	Mollusca (Mollusks)
Class	Magnoliopsida (Dicots)	Bivalvia (Bivalvia)
Order	Ericales (Ericales)	Nuculanida (Nuculanida)
Family	Ericaceae	Nuculanidae
Genus	Arbutus	Nuculana
Species	Arbutus arizonica	Nuculana pernula

Conservation Status

Arizona madrone

LC — Least Concern

Common Nut Clam

VU — Vulnerable

Physical Characteristics

Attribute	Arizona madrone	Common Nut Clam
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Arizona madrone

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Common Nut Clam

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Arizona madrone

The Arizona madrone, Arbutus arizonica, is a species. It is currently assessed as least concern on the IUCN Red List. Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Common Nut Clam

<em>Nuculana pernula</em>, sometimes referred to as a nut clam, is a small marine bivalve mollusk in the family Nuculanidae, part of the subclass Protobranchia. Like other protobranchs, <em>Nuculana pernula</em> is a deposit feeder that typically burrows into fine-grained marine sediments, using its palp proboscides to gather organic detritus and microorganisms from surface sediment layers. It typically inhabits subtidal and deep-water soft-bottom habitats along cold-temperate and boreal Atlantic coasts, with documented occurrences in Denmark, Norway, and Sweden. The species is currently assessed as Vulnerable by the IUCN, indicating that it faces a higher level of extinction risk than related species, potentially reflecting sensitivity to habitat degradation, bottom trawling disturbance, and shifts in sediment quality. Biological traits such as lifespan, body size, and diet remain poorly documented at a standardized population level for this species. <em>Nuculana pernula</em> contributes to benthic ecosystem function through sediment bioturbation and organic matter processing, and its Vulnerable status highlights the importance of protecting deep-sea and subtidal soft-sediment habitats from physical disturbance.