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4 de jun. de 2024 · Lungfish, (subclass Dipnoi), any member of a group of six species of living air-breathing fishes and several extinct relatives belonging to the class Sarcopterygii and characterized by the possession of either one or two lungs. The Dipnoi first appeared in the Early Devonian Epoch (about 419.2.
4 de jun. de 2024 · Lungfish - Classification, Evolution, Adaptations: The separation of Dipnoi as a discrete group is based largely on the skull bones, the endoskeleton of the paired fins, and the teeth. The living orders are distinguishable mainly by the number of lungs.
20 de jun. de 2024 · - Series of transitional fossils link modern lungfish and tetrapods - Paleozoic Era == First Chordates ~530 mya in Ocean == Plants, ... - Minearlized (bony) skeleton - Lobe-fins = bony rods surrounded by muscle - Diverse in Devonian - 3 Lineages today == Coelacanths (1-2 spp.) == Lungfish (6 spp.) ...
4 de jun. de 2024 · Lungfish - Gills, Lungs, Aquatic: Lungfishes have lungs derived from the swim bladder. African lungfishes burrow into the bottom of a riverbed or lake bed for their “dry sleep,” or estivation. The oldest Dipnoi is from the Early Devonian.
Hace 6 días · In 1998, Darren Naish pointed out that the lungfish and the river dolphin actually do not use their fins in this way and that e.g. the modern humpback whale has very long front flippers, supported by a mosaic of bones, but that these nevertheless mainly serve as rudders.
19 de jun. de 2024 · The skeleton was structured so large areas of skin were stretched over solid plates of bone. This bone was composed of particularly dense fibers – so dense that exchange of oxygen through the skin was unlikely. Rather, the dense ossifications served to retain water inside the body as Laccognathus traveled on land between bodies of ...
Lancelets and coelacanths are more closely related than are chimaeras and coelacanths. Organism (a) is a common ancestor of all chordates. Hagfishes, lungfishes, and frogs have lobed fins. Organism (c) is a common ancestor of lampreys and lungfishes.
