Invasive SpeciesDasysiphonia

Dasysiphonia japonica
FOUND by DJ49db42
ID Confirmed
Quality checked by SR
Peer reviewed by SR
Field Notes
We were looking for the invasive seaweed known as Dasisyphonia Japonica. There were many seaweed in our sample, but there were few filamentous samples present. In fact, there were only four filamentous seaweed samples to look at.
Supporting Evidence
Photo of my evidence.
The sample’s branches are one cell thick; D. Japonica’s branches are one cell thick.
Photo of my evidence.
Axial growth is present in the sample: D. Japonica grows axially.
Photo of my evidence.
The sample lacks Shepard’s Hooks; D. Japonica lack Shepard’s Hooks.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Dasysiphonia japonica
Common name:
Sampling method: 
Quadrat (user-placement)
Photo of our sampling method.
Place Studied
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Map this species
N 43.140500 °
W -70.620300 °
Observation Site Information
A photo of our study site.
Coastal - Rocky intertidal
Trip Information
Lobster Cove
Trip date: 
Fri, 2017-10-20 14:25
Town or city: 
Type of investigation: 
Species Survey
Time of low tide: 
Thu, 2017-11-09 20:34


Hi DJ49db42!

I like your data. The post has good evidence, good field notes, however, I do have a bone to pick. From what I have found out, Dasysiphonia japonica DOES have Shepard's Hooks. I do agree with you, you have found D. japonica, but I don't think that is because of the absence of Shepard's Hooks. You said that there were only four samples of filamentous red algae, which might mean that you just couldn't find any Shepard's Hooks.

This is still a good post, and feel free to refute me if needed.

- Ima_RD

Correction: The collection date is actually October 20th, 2017.

It looks like you might have used the date of your data posting rather than the date the sample was collected. If you share the correct date of data collection, we can make that edit.

Thank you!
-The VS Team