Ingo Arndt / Blue Crab (Discoplax hirtipes) with claws raised in defensive / aggressive posture, endemic to Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Blue Crab (Discoplax hirtipes) with claws raised in defensive / aggressive posture, endemic to Christmas Island, Indian Ocean, Australian Territory

David Fleetham / Female Pearl oyster shrimp (Conchodytes meleagrinae) in a Black lipped pearl oyster (Pinctada margaritifera) Hawaii.

David Shale / Male and female Glass shrimps on Glass sponge (Hexactinellida) from coral seamount, SW Indian Ocean, Atlantis Bank, depth around 700m, December 2011

Alex Mustard / 2020VISION / Large Prawn (Palaemon longirostris) standing on a Nudibranch (Tritonia hombergi), sheltering on dead man's fingers (Alcyonium digitatum) Loch Carron, Ross and Cromarty, Scotland, UK, April