Horned Sapsucker

Elysia cornigera

Horned Sapsucker, known scientifically as Elysia cornigera, is a small marine slug that typically reaches a maximum length of 1.5 cm. This species can be identified by its distinct horn-like structures on its body, which set it apart from other similar nudibranchs. Its coloration and shape may vary, but it generally blends well with its surroundings, making it somewhat cryptic in nature. Divers should look closely at submergent vegetation where these slugs are often found, as their small size can make them easy to overlook. This species inhabits tropical waters, specifically in the Eastern Central Pacific, Western Atlantic, and Mediterranean regions. Horned Sapsuckers are typically found at shallow depths ranging from 0 to 3 meters, often residing on seagrass beds or other types of submerged vegetation. Their diet consists primarily of algae, particularly Caulerpa and Acetabularia, which they graze on as they move slowly across the substrate. While specific details about their breeding behavior are not well-documented, like many nudibranchs, they are likely to have a complex life cycle that includes a larval stage. Encounters with Horned Sapsuckers can be interesting for divers, as they often remain stationary, allowing for close observation and photography. The species has not been evaluated for conservation status, and there is no indication of rarity, suggesting it may be relatively common in its habitat.