20 Differentiation L. obtusata/L. fabalis

20 Differentiation L. obtusata/L. fabalis

Citrina colour form of L. fabalis with coating of brown and green algae that could be mistaken for olivacea colour form that is usually confined to L. obtusata in Britain. White initial whorls resembling spirorbid worm shell are of the white early juvenile stage; this feature is found mainly on L. fabalis, but erosion of colour on L. obtusata can be mistaken for it.
Menai Strait, North Wales. July 2013.
Full account at: 02 Differentiation L. obtusata/L. fabalis

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