Low-Angle Macro View of Costasiella Sea Slug Grazing on Algae Blade in Bali

An extreme macro underwater photograph captures a low-angle, eye-level perspective of a minute Shaun the Sheep sea slug (Costasiella kuroshimae or Costasiella species) navigating the surface of a bright green algal frond (Avrainvillea species) in Bali. The sacoglossan mollusk features a translucent yellowish face with two distinct, closely set black eye spots and dark-tipped, smooth rhinophores. A crown of leaf-like cerata extends behind its head, heavily speckled with green and dark brown photosynthetic pigments obtained through kleptoplasty. Positioned near the center of a shallow depth of field, the sea slug appears nestled among fine sediment grains and delicate algal turf, surrounded by soft, glowing lime-green foreground and background bokeh. Ideal for sacoglossan behavior studies, marine biology publications, aquarist reference guides, and professional nature stock media.