Bobtail squidBobtail squid (order Sepiolida) are a group of cephalopods closely related to cuttlefish. Bobtail squid tend to have a rounder mantle than cuttlefish and have no cuttlebone. They have eight suckered arms and two tentacles and are generally quite small (typical male mantle length being between ). Sepiolids live in shallow coastal waters of the Pacific Ocean and some parts of the Indian Ocean and Atlantic Ocean as well as in shallow waters on the west coast of the Cape Peninsula off South Africa.
OmmastrephidaeLes calmars volants ou ommastrephidés (Ommastrephidae) forment une famille de calmars (céphalopodes décapodes). Selon : sous-famille Illicinae Pfeffer, 1912 genre Illex Steenstrup, 1880 sous-famille Ommastrephinae Posselt, 1891 genre Dosidicus Steenstrup, 1857 genre Eucleoteuthis Berry, 1916 genre Hyaloteuthis Gray, 1849 genre Ommastrephes D'Orbigny, 1834 in 1834-1847 genre Ornithoteuthis Okada, 1927 genre Sthenoteuthis Verrill, 1880 in 1879-1880 sous-famille Todarodinae Adam, 1960 genre Martialia Rochebrune et Mabille, 1889 genre Nototodarus Pfeffer, 1912 genre Todarodes Steenstrup, 1880 genre Todaropsis Girard, 1890 Fichier:Dosidicus gigas.
TeuthologieLa teuthologie est une branche de la malacologie consacrée à l'étude des céphalopodes. Elle complète la conchyliologie, qui traite des mollusques à coquille. Le préfixe du mot est dérivé du grec ancien teuthis (τευθίς, -ίδος «calmar, seiche») et lógos (λόγος, «parole, discours»). La malacologie s'intéresse à l'ensemble des mollusques, avec ou sans coquille. Liste des biographies des spécialistes des mollusques.
Jet propulsionJet propulsion is the propulsion of an object in one direction, produced by ejecting a jet of fluid in the opposite direction. By Newton's third law, the moving body is propelled in the opposite direction to the jet. Reaction engines operating on the principle of jet propulsion include the jet engine used for aircraft propulsion, the pump-jet used for marine propulsion, and the rocket engine and plasma thruster used for spacecraft propulsion.
Hydrostat musculaireA muscular hydrostat is a biological structure found in animals. It is used to manipulate items (including food) or to move its host about and consists mainly of muscles with no skeletal support. It performs its hydraulic movement without fluid in a separate compartment, as in a hydrostatic skeleton. A muscular hydrostat, like a hydrostatic skeleton, relies on the fact that water is effectively incompressible at physiological pressures. In contrast to a hydrostatic skeleton, where muscle surrounds a fluid-filled cavity, a muscular hydrostat is composed mainly of muscle tissue.
OsphradiumThe osphradium is a pigmented chemosensory epithelium patch in the mantle cavity present in six of the eight extant classes of molluscs (it is absent in the scaphopoda and monoplacophora; among cephalopoda, only the nautilus has what appears to be a set of osphradia), on or adjacent to the ctenidia (gills). The main function of this organ is disputed but it is believed to be used to test incoming water for silt and possible food particles or, in some species, for sensing the presence of light.
Euprymna scolopesEuprymna scolopes est une espèce de seiche de la famille des Sepiolidae, vivant dans les eaux de l'océan Pacifique Central, au niveau de l'archipel d'Hawaï et de l'île Midway. C'est une espèce côtière, qui vit dans des eaux claires et peu profondes. E. scolopes mesure en moyenne 35 mm pour 2,76 g, le mâle est légèrement plus grand que la femelle. E. scolopes se nourrit essentiellement de quelques espèces de crevettes (Halocaridina rubra, Palaemon debilis, et Palaemon pacificus) mais des élevages en laboratoire ont montré qu'il était aussi capable de manger d'autres espèces de crevettes, de poissons et même d'autres céphalopodes.
