Aglaothamnion tenuissimum
- kingdom: Plantae
- phylum: Rhodophyta
- class: Florideophyceae
- order: Ceramiales
- family: Callithamniaceae
- genus: Aglaothamnion
- species: Aglaothamnion tenuissimum
Welchman Hall
Saint Thomas
BarbadosYerseke
Zeeland
NetherlandsTallaboa
PenuelasCentral Aguirre
Salinas
Puerto RicoHugh Town
Isles of Scilly
Lymington
Rayne
England
United KingdomOak Bluffs
Massachusetts
United States