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Fig. 1. (A) Diagram of a squid iridophore, showing iridosomes (is.), which are made
up of groups of iridophore plates (ir.p.); N, nucleus (drawn using information
given in Cloney and Brocco,
1983; Mirow,
1972). The iridophore cells are oriented with their long axes
parallel to the plane of the skin, whereas the iridophore plates within the
iridosomes can be oriented at a variety of angles (see
Mirow, 1972). (B) Iridophore
stripes of the squid Alloteuthis subulata. The names are given
according to the colour reflected when the stripes are viewed in white light
at near-normal incidence. The figure also shows a cross-section perpendicular
to the long axis of a squid's mantle, in the region of the fins (d, dorsal; v,
ventral). For each stripe, solid lines indicate the iridophores; dot-dashed
lines, normal incidence to the iridophores; dotted lines, horizontal (adapted
from Mäthger and Denton,
2001). (C) Diagram showing in cross-section the location in an
iridophore of the different reflective stripes and the orientation of their
reflective plates (not to scale). ir., iridophore; ir.p., iridophore plates.
Shown also are electron micrographs of the iridophore plates with the
respective stripes shown in diagram. The electron micrographs are oriented in
the figure so that the skin surface in each micrograph (off scale, not shown)
coincides with the orientation of the skin surface in the diagram. Scale bars,
1 µm.
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