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Vampyromorphida is an order of comprising one known extant taxon species ( Vampire squid) and many extinction taxon. Physically, they somewhat resemble (their closest relatives), but are often called vampire . Unlike octopuses, their eight arms are united by a web of skin, and two smaller cilia are also present. Properly speaking, the vampire squid does not possess cilia, but cirri (cilia-like projections). Unlike most cephalopods, which are high-energy hunters, the vampire squid has an extremely low metabolic rate. This adaptation means it requires less oxygen and its food lasts longer, helping it conserve energy and thrive in these harsh deep-sea conditions. Studies show its oxygen consumption is among the lowest of any cephalopod, allowing it to occupy a competition-free niche in the deep sea where few predators or competitors can follow, since not many can survive.Seibel, B. A., Thuesen, E. V., Childress, J. J., & Gorodezky, L. A. (1999). Decline in pelagic cephalopod metabolism with habitat depth reflects differences in locomotory efficiency. Biological Bulletin, 197(2), 207–225.
The following taxa were long considered to belong to Vampyromorphida, but this placement may be incorrect:Fischer, Jean-Claude & Riou, Bernard (2002): Vampyronassa rhodanica nov. gen. nov sp., vampyromorphe (Cephalopoda, Coleoidea) du Callovien inférieur de la Voulte-sur-Rhône (Ardèche, France). Annales de Paléontologie 88(1) 1−17. French (HTML abstract)
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