Native SpeciesSmooth periwinkle

Littorina obtusata
FOUND by The Golden Ratio
2017-10-24
Cape Elizabeth
Not Yet Reviewed by Expert
Quality checked by Mr. Werner
Peer reviewed by JebronLamers
Field Notes
The cold wind greeted us like a cannon when we stepped off the bus. We were there to collect data for the scientists at Gulf of Maine Research Institute. It was about 62° degrees with the wind blowing 15 miles an hour from the south. The weather felt damp and foggy with the clouds covering 75% of the sky. There was a huge number of periwinkles on a rock bank covered in knotted wrack. We took two specimens, a smooth periwinkle and a rough periwinkle for comparison purposes. Taking photos proved difficult with the wind blowing the specimens off the page every minute, but we got a small victory when the specimen cooperated and stayed still in the sand and let us take pictures. The study site was a large group of tide pools that sat next to a grass-covered point in Kettle Cove.
Supporting Evidence
Photo of my evidence.
This is the smooth periwinkle because this specimen has a tear shaped aperture (opening). This characteristic is specific to the smooth periwinkle. The rough periwinkle has a round opening unlike this specimen.
Photo of my evidence.
Another reason this specimen is the smooth periwinkle is this specimen has a flat spire which is a characteristic of the smooth periwinkle. The periwinkle on the left is our specimen which has a very flat spire compared to the rough periwinkle on the right with a tall spire(tip.)
Photo of my evidence.
The final reason this specimen is a smooth periwinkle is the specimen is the correct size. A smooth periwinkle’s shell can grow to about 1.3 centimeters long, this periwinkle’s shell is slightly smaller than that. This periwinkle falls in the correct size range.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Littorina obtusata
Common name:
Smooth periwinkle
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
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Map this species
Latitude: 
N 43.561329 °
Longitude: 
W -70.218501 °
Observation Site Information
A photo of our study site.
Habitat: 
Coastal - Rocky intertidal
Trip Information
Name:
Kettle Cove Moniz 2017
Trip date: 
Tue, 2017-10-24 09:30
Town or city: 
Cape Elizabeth
Type of investigation: 
Species Survey
Ecosystem: 
Coastal
Watershed: 
Presumpscot
Time of low tide: 
Fri, 2014-10-24 08:26

Comments

Hi good work