Littorininae

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

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periwinkle

In this group the spiral ridges can be seen on those on the left and the horny operculum can be seen on those to the right

This dense aggregation of L. sitkana is in the upper intertidal of San Juan Island. This aggregation is in a steep-sided cove partly protected from the sun.

Sometimes the aggregations spontaneously form into pleasing shapes, such as this smile at Slip Point, WA. Photo by Dave Cowles, July 2012

Littorina sitkana, from western San Juan Island. Scale is millimeters. (Photo by: Dave Cowles, July 2006)

This individual was under the Salicornia at Penn Cove, along with multiple scattered Littorina sitkana individuals. The ruler markings are millimeters. The narrow yellowish band on a brown background is clearly visible. However, there are the beginnings of spiral ridges on the body whorl so this could just be an immature L. sitkana.