44 Patella pellucida. Early adults, Growth stage 4 (GS4), on Laminaria hyperborea frond. February 2013 (left) and July 2015. Sublittoral. Egersund, S. Norway. © E. Svensen.
Early adults (GS4), as in Britain, cease anterior shell-loss and commence thicker growth (1) with continuous growth lines all around the perimeter (2), and the anterior rises to form a dome (3). In Norway, on frond dwellers, there are usually blue lines on the new adult growth at both anterior and posterior, but the right hand specimen is an exception as it lacks blue lines on anterior new growth in common with most British specimens and GS4 Norwegian ones on stipes.
Concise Key id. features: 1Pp flic.kr/p/Z4FxDe
Part 1, SHELL FORMS: 2Pp flic.kr/p/Z4FxAi
Part 2, BODY & ANATOMY: 3Pp flic.kr/p/Z4FxtK
Part, 3 HABITS & ECOLOGY: 4Pp flic.kr/p/Z4Fx9M
Sets of OTHER SPECIES: www.flickr.com/photos/56388191@N08/collections/
44 Patella pellucida. Early adults, Growth stage 4 (GS4), on Laminaria hyperborea frond. February 2013 (left) and July 2015. Sublittoral. Egersund, S. Norway. © E. Svensen.
Early adults (GS4), as in Britain, cease anterior shell-loss and commence thicker growth (1) with continuous growth lines all around the perimeter (2), and the anterior rises to form a dome (3). In Norway, on frond dwellers, there are usually blue lines on the new adult growth at both anterior and posterior, but the right hand specimen is an exception as it lacks blue lines on anterior new growth in common with most British specimens and GS4 Norwegian ones on stipes.
Concise Key id. features: 1Pp flic.kr/p/Z4FxDe
Part 1, SHELL FORMS: 2Pp flic.kr/p/Z4FxAi
Part 2, BODY & ANATOMY: 3Pp flic.kr/p/Z4FxtK
Part, 3 HABITS & ECOLOGY: 4Pp flic.kr/p/Z4Fx9M
Sets of OTHER SPECIES: www.flickr.com/photos/56388191@N08/collections/