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  2. Lamprey - Wikipedia

    en.wikipedia.org/wiki/Lamprey

    The pineal gland, a photosensitive organ regulating melatonin production by capturing light signals through the photoreceptor cell converting them into intercellular signals of the lamprey is located in the midline of its body, for lamprey, the pineal eye is accompanied by the parapineal organ. [38]

  3. Parietal eye - Wikipedia

    en.wikipedia.org/wiki/Parietal_eye

    A parietal eye (third eye, pineal eye) is a part of the epithalamus in some vertebrates. The eye is at the top of the head; is photoreceptive; and is associated with the pineal gland , which regulates circadian rhythmicity and hormone production for thermoregulation . [ 1 ]

  4. Pineal gland - Wikipedia

    en.wikipedia.org/wiki/Pineal_gland

    The pineal gland is present in almost all vertebrates, but is absent in protochordates in which there is a simple pineal homologue. The hagfish, archaic vertebrates, lack a pineal gland. [7] In some species of amphibians and reptiles, the gland is linked to a light-sensing organ, variously called the parietal eye, the pineal eye or the third ...

  5. Pinealocyte - Wikipedia

    en.wikipedia.org/wiki/Pinealocyte

    An abundance of cilia and centrioles has also been found in these Type 2 cells of the pineal gland. [7] Unique to the Type 2 is the presence of vacuoles containing 2 layers of membrane. [ 7 ] As Type 1 cells contain serotonin , Type 2 cells contain melatonin and are thought to have similar characteristics as endocrine and neuronal cells.

  6. Sea lamprey - Wikipedia

    en.wikipedia.org/wiki/Sea_lamprey

    The sea lamprey has an eel-like body without paired fins. Its mouth is jawless, round and sucker-like, and as wide or wider than the head; sharp teeth are arranged in many concentric circular rows around a sharp, rasp-like tongue. There are seven branchial or gill-like openings behind the eye. Sea lampreys are olive or brown-yellow on the ...

  7. Least brook lamprey - Wikipedia

    en.wikipedia.org/wiki/Least_brook_lamprey

    As with all lamprey species, the least brook lamprey spends the majority of its life as a worm-like ammocoete. The ammocoete (5 mm–20 cm) is clear with a pigmented head when small (<5 cm), but becomes a dark/golden brown as it matures. Ammocoetes have pigmented eye spots located in the head that can detect light and dark.

  8. Southern brook lamprey - Wikipedia

    en.wikipedia.org/wiki/Southern_brook_lamprey

    The southern brook lamprey (Ichthyomyzon gagei) is a lamprey found in the Southern United States including Arkansas, Louisiana, Mississippi, Alabama, and Georgia. It is a jawless fish with a sucking mouth on one end of it (like a leech). It can appear to be a small eel, since it is rarely longer than one foot in length.

  9. Pacific lamprey - Wikipedia

    en.wikipedia.org/wiki/Pacific_lamprey

    The Pacific lamprey (Entosphenus tridentatus) is an anadromous parasitic lamprey from the Pacific Coast of North America and Asia in an area called the Pacific Rim. [4] It is a member of the Petromyzontidae family. The Pacific lamprey is also known as the three-tooth lamprey and tridentate lamprey. Ammocoetes held by biologist in the Carmel River