Nudibranch (Flabellina)

Flabellina exoptata

Sighting evidence at Osezaki, Izu Peninsula

Photo: crawl_ray · CC BY-NC

Osezaki hosts over 100 nudibranch species, with flabellinids being among the most conspicuous as they graze on hydroids encrusting the volcanic substrate. Their vivid cerata serve dual purposes — sequestering stinging nematocysts from hydroid prey for their own defence while also advertising toxicity to would-be predators.

Evidence at this site

0 records within 25 km

Confidence: low

No date on file

How is this calculated?

Sighting evidence is compiled from iNaturalist observation records within a set proximity radius, filtered for quality-grade observations. “Last confirmed” is the date of the most recent research-grade record. Record count covers a rolling 24-month window. Confidence reflects record count, recency, and consistency of seasonal signal.