Waving Goodbye by ChrisMelcherPhotography

How to say goodbye to Cephalopod Week? Like a cuttlefish making an exit! When threatened, a cuttlefish can produce a cloud of ink and jet away by expelling a forceful stream of water through its siphon. Until next year, ceph-fans!

cloudair:

Four-fold radial symmetry.

lifeunderthewaves:

Out for a Swim by mikemcelfish

breathtakingdestinations:

La Pared Beach – Fuerteventura – Spain (by Xavier)

noaasanctuaries:

Bad hair day? Not quite!

This is Dendronotus iris, a kind of nudibranch. Those “hairs” you see are actually branching gills, which can be tipped with white, orange, yellow, or purple. This nudibranch prowls the rocky reefs of Monterey Bay National Marine Sanctuary for anemones to chow down on.

(Photo: Chad King/NOAA)

[Image: A close view of a nudibranch, a shell-less mollusk. The nudibranch is dark red, with orange branching gills.]