A simple eye or ocellus (sometimes called a pigment pit) is a form of eye or an optical arrangement which has a single lens without the sort of elaborate...

thousands of lenses per eye. In contrast to compound eyes, simple eyes have a single lens. Jumping spiders have one pair of large simple eyes with a narrow...

in their structure, arrangement, and function. They usually have eight, each being a simple eye with a single lens rather than multiple units as in the...

the retina of vertebrate eyes Simple eye in invertebrates (Ocellus), photoreceptor organ ("simple eye") of invertebrates often composed of a few sensory...

main, compound eyes. Arthropod eye Mollusc eye Simple eye in invertebrates Vision in fish Eakin, R. M (1973). The Third Eye. Berkeley: University of California...

were thought to grow in rows, inserted between existing rows of ocelli. Mollusc eye Parietal eye Simple eye in invertebrates Vision in fish Optic lobe (arthropods)...

Simple eye in invertebrates Vision in fish Visual system Serb, J. M.; Eernisse, D. J. (2008). "Charting Evolution's Trajectory: Using Molluscan Eye Diversity...

looks somewhat like an eye Eyespot, a sensory organ of invertebrates; see simple eye in invertebrates Eyespot, a type of eye in some gastropods, a part...

Mollusc eye Parietal eye Simple eye in invertebrates Visual system Meyer-Rochow, V. Benno; Stewart, Duncan (1996). "Review of larval and postlarval eye ultrastructure...

into the eye. They also have a high number of rods in their retina that are sensitive to dim light. While these improve the ability to see in darkness...

greater divergence of the eye axis than humans, enabling them to rotate their pupils farther in any direction. The divergence of the eye axis of dogs ranges...

Look up ocellus in Wiktionary, the free dictionary. An ocellus is a simple eye found in invertebrates, in which pigment is distributed randomly and for...

naked eye 'tis evident that the stem or quill of each Feather in the tail sends out multitudes of Lateral branches, ... so each of those threads in the...

Whether invertebrates can feel pain is a contentious issue. Although there are numerous definitions of pain, almost all involve two key components. First...

account for stereo vision being present in mammals, birds, amphibians, and some invertebrates. For toads in particular, stereopsis would prove massively...

evolution of the eye attractive to study because the eye distinctively exemplifies an analogous organ found in many animal forms. Simple light eye evolution...

origins of the anatomical features of the eye. One likely chain of development is that the eyes originated as simple patches of photoreceptor cells that could...

of an animal are derived from the embryonic germ layers. Those simpler invertebrates which are formed from two germ layers of ectoderm and endoderm are...

Box jellyfish (class Cubozoa) are cnidarian invertebrates distinguished by their box-like (i.e., cube-shaped) body. Some species of box jellyfish produce...

18 species in two genera. The family name Chlorophthalmidae derives from the Greek words chloros meaning "green" and ophthalmos meaning "eye". Some species...

and G proteins in the fan worm's eyes, which were previously only seen in simple ciliary photoreceptors in the brains of some invertebrates, as opposed to...

Ireland's Eye (Irish: Inis Mac Neasáin) is a small long-uninhabited island off the coast of County Dublin, Ireland. In ancient times it was called 'Adros'...

foliage, but also includes a wide variety of seeds, berries, shoots and invertebrates. The mountain bamboo partridge is fairly common throughout its range...

these criteria are difficult to measure in nonhuman animals, cephalopods are the most intelligent invertebrates. The study of cephalopod intelligence also...

also demonstrating similar features to TLRs of invertebrates despite their lineage. In short, TLRS in amphioxus propose a paraphyletic relationship with...

the organism. Epimorphosis regeneration can be observed in both vertebrates and invertebrates such as the common examples: salamanders, annelids, and...

John E. (2014). "Order Ephemeroptera". In Thorp; Rogers (eds.). Thorp and Covich's Freshwater Invertebrates (4th ed.). Academic Press. pp. 873–891. Hauer...

ˈluːsɪdəm/ tə-PEE-təm LOO-sih-dəm; pl.: tapeta lucida) is a layer of tissue in the eye of many vertebrates and some other animals. Lying immediately behind the...

visible to the naked eye. It is cylindrical, about 1mm in diameter and up to 4 cm (1.6 in) in length. The head is buried deep in the sponge and is difficult...

also include acrogymnosperms and ferns. In the lycopods, with different evolutionary origins, the leaves are simple (with only a single vein) and are known...