03/06/2026
Hitchhikers. Did you know that many creatures of the ocean live in commensal relationships with their hosts? This is a "relationship in which one organism benefits, while the other species is neither helped nor harmed." Here are two that live on the venomus, fire urchin and only found in the Indo-Pacific. The rare Coleman shrimps are found living in male and female pairs among the spines of the fire urchin. They grow to 2 cm (that's less than an inch). The zebra crab is another wonderful macro find that hitches rides on the fire urchin. The crab's stripes help to give it more camouflage in its urchin haven. It's carapace is only 1/2 inch wide. Underwater photographers love to find them, but the Coleman shrimp is definitely on our "would love to find and photograph list." Glad to have had the chance to observe and photograph these while diving in Anilao, Philippines. Take at Crystal Blue Resort in Anilao, Philippines. Nikon Z8 in Nauticam housing with 105mm macro lens, 2 Ikelite strobes.