Mollusks · La Saladita, Guerrero

Sea Swallow

Glaucus atlanticus

Spanish: Dragón marino azul

Sea Swallow (Glaucus atlanticus)
Photographed by salvador111 on iNaturalist

Glaucus atlanticus (common names include the sea swallow, blue angel, blue glaucus, blue dragon, blue sea slug and blue ocean slug) is a species of small, blue sea slug, a pelagic aeolid nudibranch, a shell-less gastropod mollusk in the family Glaucidae. Most often recorded in Feb.

TaxonomyGastropoda › Nudibranchia › Glaucidae
Local records1 research-grade observation within about 50 km of La Saladita (the survey box also takes in Zihuatanejo, Ixtapa and Troncones)
Global records1,473 on iNaturalist
Recorded here2023 – 2023
Months recorded near La Saladita
JanFebMarAprMayJunJulAugSepOctNovDec
Recent local sightings

Interactive card with more photos, sounds and similar species Mollusks guide iNaturalist Wikipedia

Cite as: “Sea Swallow (Glaucus atlanticus) at La Saladita”, La Saladita Field Guide, lasaladita.com/species/glaucus-atlanticus/, updated 2026-09-26. Observation counts and months come from iNaturalist research-grade records within about 50 km of 17.8375°N, 101.7606°W (the survey box also takes in Zihuatanejo, Ixtapa and Troncones); summary text from Wikipedia where present.