Invasive SpeciesOrange sheath tunicate

Botrylloides violaceus
FOUND by treehugger
South Portland
ID Confirmed
Quality checked by treehugger
Peer reviewed by
Field Notes
Low tides were at 11:05 today. We were searching for tunicates along the dock in order to determine how invasive certain species were. We were on the docks around 9 AM.
Supporting Evidence
Photo of my evidence.
This has similar coloration to orange sheath tunicate. The growth was underneath the dock.
Photo of my evidence.
This seems to have a large growth on a blue mussel. We found it very close to the dock which is where the tunicate is normally found and it was slimy like is should be.
Photo of my evidence.
While is coloration was slightly darker it was once again found on a blue mussel with similar texture and consistency to the others.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Botrylloides violaceus
Common name:
Orange sheath tunicate
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
We’re sorry, JavaScript is required to view the map. If JavaScript is you may wish to upgrade to a newer browser in order to view this map.
Map this species
N 43.649694 °
W -70.231003 °
Observation Site Information
A photo of our study site.
Coastal - Dock
Trip Information
Port Harbor Marine 2017
Trip date: 
Fri, 2017-06-30 08:42
Town or city: 
South Portland
Type of investigation: 
Species Survey
Time of low tide: 


Nice work - definitely Botrylloides!