Stats

Lifespan: 8-15 yrs
Size: Small
Diet: Filter feeder
Activity: Cathemeral
Social: Colony
Biome: Intertidal zone
Range: North America
Movement: Sessile
Breeding: Egg-laying
Defense: Armor
Status: Uncommon

About

Pacific Acorn Barnacles are small, single-celled creatures that live on the hard surfaces of rocks and piers in the intertidal zone. They have two oxygen-absorbing structures on their heads, allowing them to breathe both underwater and above the waterline.

Life cycle

1.
juvenile
A clearly-young animal, past the newborn phase but well short of full adult size.
2.
adult
Fully grown.

Learn more

View on iNaturalist →

Taxonomy

Kingdom: Animalia
Phylum: Arthropoda
Class: Hexanauplia
Order: Balanomorpha
Family: Balanidae
Genus: Balanus
Species: Balanus glandula