An educational resource dedicated mainly to the photography
and diversity of marine life that can be found in coastal waters
and intertidal areas of Great Britain and Ireland by David Fenwick.

Seaweed galls and their causative agents (Algal gall images)
Galls caused by marine nematodes / eelworms

Rhabditida (Order) > Tylenchina (Suborder) > Tylenchomorpha (Infraorder) > Sphaerularioidea (Superfamily) > Anguinidae (Family)

Halenchus dumnonicus Coles, nematode gall
on 1958 Bladder Wrack, Fucus vesiculosus

Halenchus fucicola (de Man, 1892) Cobb, 1933,
nematode gall on Ascophyllum nodosum, Egg Wrack


Galls with un-identified agents

Furbellows, Saccorhiza polyschides galled by unknown agent, Newlyn, 17.03.17.

Kelp / Oarweed, Laminaria digitata galled by unknown agent, Battery Rocks, Penzance, 31.10.16.

Sea Oak, Halidrys siliquosa galled by unknown agent, Hannafore, Cornwall, 30.03.17.

Knotted / Egg Wrack, Ascophyllum nodosum, galled
by unknown agent, Perranporth, Cornwall, 30.01.15.

Dulse, Palmaria palmata, galled by unknown
agent, Mousehole, Cornwall, 16.04.18.

Dulse, Palmaria palmata, galled by unknown
agent, Penzance, Cornwall, 25.08.18.

Dead Man's Rope / Sea Lace, Chorda filum,
galled / distorted / spiralled growth, unknown agent.


For mines in algae see -

Dactylopusioides macrolabris (Claus, 1866)
- Copepod mining the brown algae Dictyota dichotoma

Diarthrodes feldmanni Bocquet, 1953
- Copepod mining the red algae Cryptopleura ramosa

Sealife Survey
Record UK marine life using the the Marine Biological Association's Sealife Survey (external link)

Seaweed Algal Galls and their causative agents fungi bacteria virus nematode images UK