kleptoparasitism

Mosaic Boxer Crab, Lybia tessellata Bali DeLoach BlennyWatcher

Kidnapped – Boxer Crabs Wielding Anemones and…Nudibranchs?!

October 10, 2020

At first glance, adorable little boxer crabs don’t look like kidnappers, but a closer look reveals incriminating evidence—living anemones grasped tightly in each claw. As it turns out the crabs, which spend the day hiding beneath rocks along shorelines in the Indo-Pacific, commandeer hostages for gathering food as well as protection.  This novel form of symbiosis was labeled as kleptoparasitism—the theft of food—in a 2013 scientific paper. The authors studied the relationship using aquarium experimentations and observations. In an unexpected … Read more

Yellownose Goby peeks out of a Christmas Tree Worm

Christmas Tree Thief

July 27, 2020

When I became a diver, worms were among the first reef creatures to attract my attention. More accurately, it was the exposed crowns of frilly gills of Christmas Tree Worms, Spirobranchus giganteus, that drew my eye—so colorful, so appealing, so utterly unwormlike, and to Anna’s and my unending irritation, gone in a flash whenever we swam too close. While the worms’ long segmented bodies remain tucked away safe and sound inside strong calcareous tubes, their delicate crowns, vital for absorbing … Read more