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Semibalanus	Characteristic look of walls and “beak” (upper center)
	(note limpets etc between barnacles)

	“Thatching”
	These are in a more scoured area than above, making for a different look to walls The “beaks” (1) are pointed; and slope down from one side (which is modified ---see empty one at center); they usually show a characteristic zipper like (VVV ) series where plates meet (right and below) Note the Chthamalus (inside the 0 for size comparison

Here is a video of a ‘beak’ (tergum+scutum) (left image) moving toward upper (carina) wall (maximum defense?) right when sense my hand moving above them I could also hear them making a clicking sound sa beaks met walls.

Empty barnacles found in breccia; one of them still has the “Beak” inside, which I removed Left: Seen from base (contrast with solid calcareous base in Balanus spp.)	Beak (the tergum) and ‘zippered’ scutum
	Note: the zippered Scutum and the especially the diagnostic ‘tubular’ construction of the Semibalanus wall

Composed on June 2, 2002; by LG

Last modified 6/6/02 12:46 PM