What We Do Citizen Science Great Eggcase Hunt British Isles & NW Europe BLUE SKATE (Dipturus batis) Previously known as the Common Skate, which is now known to have masked 2 species - Flapper Skate and Blue Skate.Size:Maximum Eggcase Length: ~21cm (ranges from 19–24cm)Eggcase Length (without horns): ~14cm (ranges from 13-15cm)Maximum Eggcase Width (with keels): ~7cm (ranges from 6-8cm)Range: In the Northeast Atlantic, it's present from Iceland and the northern North Sea around to the western British Isles and Celtic Sea. The Blue Skate generally has a more southerly distribution than the Flapper Skate. But the distribution of both species overlaps in the Celtic Sea to northwest Scotland. Similar Eggcase: The much larger Flapper Skate eggcase. Great Eggcase Hunt Records: Few beach records of Blue Skate eggcases have been reported to the Great Eggcase Hunt, but all have been submitted from Cornwall. Underwater records are from scientific surveys.