Physical and morphological aspects of the eye of the manatee trichechus inunguis natterer 1883: (Sirenia: Mammalia)

摘要: The eyes and aspects of vision the Amazonian manatee Trichechus inunguis NATTERER 1883: (Sirenia: mammalia) have been examined in five animals, relation to previous findings for sirenians. This paper presents a review confirming those upon gross ocular anatomy, retinal histology refraction. confirmation primarily rod retina, high receptor: ganglion cell ratio low refractive error under water were note. A visual pigment based vitamin A1 difference spectrum λ max at 505 nm was agreement with Dartnalls nomogram. suggest retina more suited light levels best, moderate acuity, though motion perception appears present degree binocular possible.