What: A Striped Pajama nudibranch (Chromodoris quadricolor) browsing on a brightly colored sponge (Negombata sp.), which is the favorite food of this nudibranch species. Where: I photographed this nudibranch in the Red Sea, at Tiran Island.

by B. N. Sullivan Linckia sea stars all have plump, cylindrical arms, making the genus easy to recognize.  Earlier this month we posted a photo of a purple sea star, Linckia multifora.  Our fellow diver and underwater photographer Andrew Cooper...

by B. N. Sullivan This is the mouth of the Waipiʻo Valley, situated on the northeastern coast of Hawaii's Big Island, in the Hamakua district.   The remote valley is historically important as the childhood home of King Kamehameha I, but we think its...

What: Sea star (Linckia multifora), family Ophidiasteridae. Common names include: Spotted Linckia; Multi-pore Sea Star; Multicolor Sea Star. Members of this genus have cylindrically shaped rays, and skin that has a rough, granular surface. They come...

by B. N. Sullivan Awhile back we had some fun with our 'Every Seashell Has a Story' series, in which we presented photos and tales of marine molluscs that produce and live in shells.  Another interesting and often very pretty class of marine animals...