As a member of Class Gymnolaemata,
Order Ctenostomata this species has zooecia
which are uncalcified. Flustrellida corniculata
a fleshy, leathery, erect (sometimes encrusting on seaweed) structure
soft, flattened lobes and covered with many forked, antlerlike
The color is pale tan to dark brown. Microscopically, the
extend through slitlike apertures that are less distinct than those of
most bryozoans (partly because most bryozoans have a glassy or
covering while this species, and other Ctenostomatans, does
Each lophophore has 18 tentacles. The autozooids are 0.4 to
wide. Other zooids, called kenozooids, are smaller and bear
Flustrellidra corniculata Smitt, 1871
Common name(s): Seaweed muffs
|Flustrellidra corniculata at
|(Photo by: Dave Cowles,
How to Distinguish from
There are no similar species in this area.
Alaska to Point
Buchen, central CA
Attached in the lower rocky
intertidal, or as sheaths on the stipes of seaweeds such as Laminaria
and Corallina officinalis.
often wash ashore on exposed beaches during storms, and look a bit like
Corniculata means "having little horns".
and Carlton, 1975
and Brusca, 1978
et al., 1980
and O'Clair, 1998
et al., 1985
General Notes and
Observations: Locations, abundances,
The forked spines can be seen in this closeup photo
Flustrellidra corniculata is frequently found
growing on algae.
At Beach #4 near Kalaloch many can be found growing on Laminaria
holdfasts such as this example.
Photo by Dave Cowles July 2008
Authors and Editors of Page:
Dave Cowles (2005): Created original page