Lamellar Body = Pineal Gland

See also: Lamellar Body = Pineal Eye      Amphioxus Hormones        Endostyle = Thyroid  
Amphioxus Gut Hormones
  Amphioxus Pituitary     Amphioxus Gonads  
Amphioxus Stress Hormones    Amphioxus Oxytocin    
Amphioxus Genomics           

Pineal gland (Wiki) 
This description of the human pineal is provided for reference. 

Melanopsin (Wiki)   
Melanopsin is a photopigment found in specialized photosensitive ganglion cells of the  retina that are involved in the regulation of circadian rhythms, pupillary light reflex, and other non-visual responses to light. In structure, melanopsin is an opsin, a retinylidene protein variety of G-protein-coupled receptor."  "In non-mammalian vertebrates, however, such as birds, fish and amphibians, melanopsin is found in certain other retinal cells, and also outside the retina in structures known or presumed to be directly photosensitive, such as the iris muscle of the eye, deep brain regions, the pineal gland, and the skin.

1998    60<72 
Localization and partial characterization of melatonin receptors in amphioxus, hagfish, lamprey, and skate.
    "Through its secretion of melatonin, the pineal complex of vertebrates exerts a range of physiological effects including regulation of circadian rhythms, seasonal reproduction, metamorphosis, and body color change.
    "No specific binding was found in hagfish or amphioxus, which lack a pineal complex.