Retinal Development and Ommin Pigment in the Cranchiid Squid <i>Teuthowenia pellucida - Fig 3 </i> (Cephalopoda: Oegopsida)

<p>(A) Cross-section of adult (ML 52 mm) <i>T</i>. <i>pellucida</i> retina showing retinal layers and progressive dorsal—ventral lengthening of outer photoreceptor segment. Migrated ommin pigment in dorsal (B) and equatorial (C) regions and representative areas are shown in high magnification (B’, C’). (D) Oblique section through outer photoreceptor segment shows that migrated ommin pigment is located between photoreceptor cells; black circles indicate areas of clustered pigment granules. Abbreviations: rudimentary cartilage (c). All other abbreviations as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0123453#pone.0123453.g002" target="_blank">Fig 2</a>. Scale bars = (A) 100 μm, (B’–D) = 10 μm.