Native SpeciesRough periwinkle

Littorina saxatilis
FOUND by Periwinkle People
Cape Elizabeth
Not Yet Reviewed by Expert
Quality checked by mr p
Peer reviewed by AL OL
Field Notes
The time is 9:00 and the class just got off the bus, the citizen scientists take a couple of minutes to regroup and get their things together. The temperature was very cold and the grey clouds were completely covering the sky. It was very clearly low tide but there wasn’t much seaweed on the sandy part of the beach, it was mostly on the rocks. When the Periwinkle People started to explore on the rocks they had a hard time getting around because the rocks were very slippery. It took the group longer than expected to find the Rough Periwinkle because all of the other periwinkles didn't have the same characteristics, all of the species that we found were either the Common or the Smooth Periwinkle. After a little more looking the group eventually found the Rough Periwinkle near a small tide pool that was next to a giant rock sticking out of the ground.
A sketch of our study site.
Supporting Evidence
Photo of my evidence.
A Rough Periwinkle was located at Kettle Cove Beach in Cape Elizabeth Maine. One way to confirm that it indeed was a Rough Periwinkle is according to the Vital Signs ID cards, the Rough Periwinkle is yellowish with grayish whorls, unlike the Smooth Periwinkle which most of the time the shell is yellow or a more vibrant color, and the Common Periwinkle which is more of a brown color. The shell also has more of a rougher look and texture than the Common or Smooth Periwinkles.
Photo of my evidence.
Another way to identify a Rough Periwinkle is according to Vital Signs the spire of a Rough Periwinkle is short. The spire of a Rough Periwinkle is usually shorter compared to the Smooth Periwinkle, which has a flattened spire, also the spire of the Rough Periwinkle is longer than the Common Periwinkle.
Photo of my evidence.
A third identifying characteristic the citizen scientists used to identify the Rough Periwinkle is where it’s located. According to the Vital Signs ID Card, the Rough Periwinkle likes to be in a dry upper intertidal zone. The group found the Rough Periwinkle on the rocks away from the seaweed where the Smooth Periwinkle likes to be. It took the citizen scientists about 20 minutes to locate the periwinkle, which was unusual because there were many other periwinkles. The Common and Smooth Periwinkles were easier to find but it was more difficult to find the Rough Periwinkle. Using Identifying characteristics, such as where it is located, the shell colors, and the spire shape, the group was able to successfully find a Rough Periwinkle.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Littorina saxatilis
Common name:
Rough periwinkle
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
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Map this species
N 43.561175 °
W -70.217571 °
Observation Site Information
A photo of our study site.
Coastal - Beach or dune
Trip Information
Kettle Cove 2017
Trip date: 
Tue, 2017-10-24 09:00
Town or city: 
Cape Elizabeth
Type of investigation: 
Species Survey
Time of low tide: 
Tue, 2017-10-24 08:30
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