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Semibalanus juveniles in ‘gut’ area	Semibal or Balanus?
	I wasn’t positive so took closer look

The image left is unmistakably Semibalanus – even though looks like leaving a marking where removed from substrate – I am interpreting latter as ontogenic – used by juveniles but lost later in development see below

	Limpet this years – lines where plates meet more developed in adults but diagnostic

	Interpret these ‘membranes’ as needed by juveniles but not maintained later in growth

Created by LG on AUG 21/2005

Last updated on Sunday, August 21, 2005

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Semibal or Balanus?

Interpret these ‘membranes’ as needed by juveniles but not maintained later in growth