Barreleye Fish Facts: 11-15 | Mouth, Nostrils, Adaptations. However, in 1911 it was better studied by the researcher Zugmayer. Argentinidae), an epibranchial or crumenal organ is present behind the fourth gill arch. The barreleye fish, a member of the clade Protacanthopterygii (PROH-tuh-kan-THOP-tuh-RIJ-ee-eye), looks like nothing you've ever seen — unless, of course, you've seen a barreleye fish. On this episode of Animal Fact Files discover some deep sea fish with amazing eyes! To confirm this theory an anatomical study was carried out by Partridge. The most characteristic of this fish is that they have two unusual bumps in their eyes that allow them to have a much more developed vision than the common barreleye fish. Marine vehicles have been developed capable of accurately capturing the movements and static moments in which the barrel eyes fish is found. These fish do not have a spine, but they do usually have a long pectoral fin that somewhat resembles a wing. Although the eyes of the conventional barrel eye fish and all the species of the family are very particular, the focus system used by this particular specimen will leave you with your mouth open. The living body of most species is a dark brown, covered in large, silvery imbricate scales, but these are absent in Dolichopteryx, leaving the body itself a transparent white. Point of Contact: firstname.lastname@example.org. It is less than 10 cm (4 inches) in length and brownish in colour. Their most outstanding trait’s its dome-shaped head that is transparent on the top since it’s filled with a transparent liquid. However, it is not a legal authority for statutory or regulatory purposes. A very curious fact is that it lack spines on the fins, its radii are soft reaching between 10 and 11 on the dorsal fin while having between 8 and 9 rays on the anal fin. The main difference that this barreleye fish presents with respect to the rest of its relatives is that the eyes of its relatives are capable of providing them images without focusing, that is, they can see silhouettes and contours of the other animals. Many of its specimens are also found in California, United States. Because of the particular shape of their eyes resembling a barrel is that they are known as «barreleye.». The ventral surfaces of Opisthoproctus species are characterised by a flattened and projecting 'sole'; in the mirrorbelly (Opisthoproctus grimaldii) and Opisthoproctus soleatus, this sole may act as a reflector, by directing the emitted light downwards. The chordates (from Chordata, from the Greek χορδωτά) are characterized by the presence of a notochord of turgid cells, a hollow dorsal neural tube, gill slits and tail , at least at some stage of their embryonic development. With some simulations in computers Partridge demonstrates that the precise orientation of the plates, which added to the curved surface make the perfect scenario to focus the light on the lateral retina of the barrel eye fish. We invite you to read our article mantish shrimps to learn about other creature with interesting visions kills. The morphology of the Opisthoproctidae varies between three main forms: the stout, deep-bodied barreleyes of the genera Opisthoproctus and Macropinna, the extremely slender and elongated spookfishes of the genera Dolichopteryx and Bathylychnops, and the intermediate fusiform spookyfishes of the genera Rhynchohyalus and Winteria. What little is known of barreleye reproduction indicates they are pelagic spawners; that is, eggs and sperm are released en masse directly into the water. Disclaimer: ITIS taxonomy is based on the latest scientific consensus available, and is provided as a general reference source for interested parties. 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