Calcaneal spurs are detected by an imaging technique.
Polycera fujitai is a species of sea slug , a nudibranch , a shell-less marine gastropod mollusc in the family Polyceridae .. Polyceridae. Polyceridae. Polycera. Polycera. species. species. sea slug. sea slug. nudibranch. nudibranch. marine. marine ( ocean ). gastropod. gastropod. mollusc. mollusc