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...

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...

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...

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

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...

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)...

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...

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...

eye attractive to study because the eye distinctively exemplifies an analogous organ found in many animal forms. Simple light detection is found in bacteria...

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...

Pain in invertebrates is a contentious issue. Although there are numerous definitions of pain, almost all involve two key components. First, nociception...

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

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...

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...

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...

They feed primarily on algae, but will occasionally consume sessile invertebrates (including crustaceans, worms, and molluscs). They are considered commercially...

jellyfish) include: the evolution of jellyfish vision from simple to complex visual systems), the eye morphology and molecular structures of box jellyfish (including...

as short tandem repeats (STRs) by forensic geneticists and in genetic genealogy, or as simple sequence repeats (SSRs) by plant geneticists. Microsatellites...

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 Anciently called 'Adros' by Ptolemy, 'Adrea Deserta' by Pliny, and 'Andros' and 'Edria' by other early navigators. (Irish: Inis Mac Neasáin)...

each eye for visual processing. Cephalopods such as the octopus and squid have the largest brains of any invertebrates. There are several invertebrate species...

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

hagfish as elementary vertebrates in between invertebrates and gnathostomes. However, discussion has long occurred in scientific literature about whether...

Wanninger, Andreas (11 August 2015). Evolutionary Developmental Biology of Invertebrates 6: Deuterostomia. Springer. pp. 93–94, 108–109. ISBN 978-3-7091-1856-6...

neurons compose muscle spindles. There is a similar division of encoding in invertebrates; different subgroups of neurons of the chordotonal organ encode limb...

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