Results of detailed electrophysiological recordings made from all known Limulus photoreceptors suggested Limulus expresses four different spectral types of opsins (Table 1): (1) a long wavelength-sensitive (LWS) opsin in LE retinular and giant VE photoreceptors (Millecchia et al., 1966; Nolte and Brown, 1970), (2) a LWS opsin in some ME photoreceptors that is different from that in LE retinular cells and giant VE photoreceptors (Nolte and Brown, 1970), (3) a UV-sensitive opsin in most ME photoreceptors (Nolte and Brown, 1970, 1972), and (4) a short wavelength-sensitive (SWS) opsin in some cells in each abdominal ganglion (Mori and Kuramoto, 2004; Mori et al., 2004).
LpOps 1-4 and LpOps5 are coexpressed in LE retinular cells and the giant photoreceptors of larval eyes
LpOps 1-4 and LpOps5 coexpression in rhabdoms in LE retinular cells and giant VE photoreceptors was confirmed with immunocytochemical assays.
Pigment layer.--Pigment cells are not only found surrounding the retinular cells, but also distant from the eye.
The axons are moderately densely stained and contain numerous microtubules, some mitochondria and occasionally also some of the granules described from the retinular cells (see above).
The reason for this is the peculiar arrangement and shape of retinular cells, which do not show an evident regular organization of the retina, and the limited material available for this study.
plebs have shown that light adaptation at 0 [degrees]C and an increase in temperature to 10 [degrees]C in the dark cause similar migrations of screening pigment granules in
retinular cells, but microvillar damage absent under light adaptation was severe in the dark at 10 [degrees]C (Meyer-Rochow and Tiang, 1979, 1982).
Each eye is located within a lateral "pocket" of the cephalon and composed of radially arranged ommatidia, each with a spherical lens and underlying
retinular cells [ILLUSTRATION FOR FIGURES 2, 5, 6A, B OMITTED].
The retinular cells contain shielding pigment granules.
The retinular cell projection is modified in 'Chorocaris' by its distinctive brain morphology.
They point anteriorly over much of the eye with an interommatidial angle of around 3 [degrees] [ILLUSTRATION FOR FIGURE 5B OMITTED] and taper posteriorly, where they are surrounded by seven retinular cells [ILLUSTRATION FOR FIGURE 5C OMITTED].
Unorthodox pattern of microvilli and intercellular junctions in regular
retinular cells of the porcellanid crab Petrolisthes.