Figure 1: Morphology of the cyprid adhesive apparatus and the expressed adhesive plaque.
From: Synergistic roles for lipids and proteins in the permanent adhesive of barnacle larvae
(a) A schematic of the anterior section of a barnacle cypris larva, with particular focus on the cementation apparatus: c.g., cement gland; m.s., muscular sac; c.d., cement duct; a.d., adhesive disc; o., oil bodies; c.e., compound eye; IV, fourth antennular segment, as per Walker17. (b) A confocal volume projection of a cyprid antennule labelled with a membrane dye showing the 2nd, 3rd and 4th segments of the antennule, the adhesive disc (a.d.) and setae of the 4th segment (IV). (c) Confocal micrograph of a cyprid adhesive plaque stained for proteins. Embedded within the plaque are the adhesive discs appearing as dark central regions and setae of the 4th segment. When viewed this way, the plaque appears to approximate the homogeneously proteinaceous, low-density structure originally described by Walker17, surrounded by a more protein-dense ‘skin’ (white arrow). (d) An isosurface rendering of c showing its 3D structure. (e) A sketch of the cyprid adhesive plaque as per Walker’s17 description; adhesive plaque: a.p. Scale bars, ~20 μm (b–d).
