Invertebrate photoreceptor development

Čolović, Ozren (2012) Invertebrate photoreceptor development. Bachelor's thesis, Faculty of Science > Department of Biology.

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Abstract

This paper deals with the basic builds of invertebrate eyes and their evolutionary development. Different types of animal eyes developed multiple times over evolution's course, their similarity among various phyla serving as a good example of convergent evolution. In single-cell organisms, photoreceptors most commonly take the form of eye spots, corresponding to pigment spots in primitive multicellular organisms. Over the course of evolution, pigment spots deepen into pigment cups, acquiring additional elements with the purpose of enhancing vision by increasing precision, acuity and refraction of light. The nervous system grows simultaneously in order to process information from the eye. Arthropods evolve multi-faceted compound eyes, while cephalopods, vertebrates and some cnidarians evolve simple eyes of complex build. We can conclude that the complexity of eyes reflects the environment and mode of existence of various organisms.

Item Type: Thesis (Bachelor's thesis)
Supervisor: Primc, Biserka
Date: 2012
Number of Pages: 24
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 13 Oct 2014 10:47
Last Modified: 13 Oct 2014 10:47
URI: http://digre.pmf.unizg.hr/id/eprint/3016

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