Pentidotea montereyensis

Distinguished from other Pentidotea species by geographic restriction to the Monterey region and temperate northern Pacific, though detailed morphological differentiators from congeners (such as P. wosnesenskii or P. resecata) are not clearly documented in available sources. Examination of pleopod structure and uropod morphology by a specialist is likely required for definitive identification.

Marine coastal environments, specifically associated with kelp forests and macroalgal beds. Found on brown algae including kelps (Laminariales) and other large seaweeds where it clings to fronds.

Temperate northern Pacific Ocean; specifically documented from the Monterey region of California, USA, with distribution extending through appropriate habitat in the northeastern Pacific.

Herbivorous, feeding on macroalgae. Has been observed grazing on kelp and other brown algae.

• Macrocystis pyrifera - habitatGiant kelp; primary habitat substrate
• Nereocystis luetkeana - habitatBull kelp; documented host alga

Clings to algal fronds using flattened body and modified appendages; remains motionless when disturbed as camouflage strategy.

Herbivore in kelp forest ecosystems; contributes to algal biomass processing and serves as prey for fish and invertebrate predators.

No direct economic importance; occasionally encountered by tidepool visitors and divers. Serves as indicator species for kelp forest health.

• Pentidotea wosnesenskiiOverlaps in range and habitat; distinguished by subtle morphological differences in pleopod structure and antennal flagellum segments
• Pentidotea resecataSimilar flattened body form and algal association; P. montereyensis restricted to Monterey region while P. resecata has broader northeastern Pacific distribution
• Idotea spp.Related genus in same family; Idotea species generally more robust with different uropod morphology and often found in Atlantic or European waters

• marine
• crustacean
• isopod
• kelp forest
• herbivore
• Pacific coast

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life