Standard measurements for squid, showing the location of the fins and tail in different configurations
Measurement of fin angle in a squid with sagittate fins
Cephalopod fins, sometimes known as wings,[1] are paired flap-like locomotory appendages. They are found in ten-limbed cephalopods (including squid, bobtail squid, cuttlefish, and Spirula) as well as in the eight-limbed cirrate octopuses and vampire squid. Many extinct cephalopod groups also possessed fins. Nautiluses and the more familiar incirrate octopuses lack swimming fins. An extreme development of the cephalopod fin is seen in the bigfin squid of the family Magnapinnidae.[2]
Fins project from the mantle and are often positioned dorsally. In most cephalopods, the fins are restricted to the posterior end of the mantle, but in cuttlefish and some squid they span the mantle's entire length.
Fin attachment varies greatly among cephalopods, though in all cases it involves specialised fin cartilage (which reaches its greatest development in Octopodiformes).[3] A fin may be attached to the internal shell or shell remnant (such as the gladius), to the opposite fin, to the mantle, or a combination of these.[4]
Time series showing up-and-down fin movement in an individual of the cirrate octopod Cirroteuthis muelleri
^Young, R.E., M. Vecchione & K.M. Mangold (1999). Cephalopoda Glossary. Tree of Life Web Project.
^Vecchione, M. & R.E. Young (1998). The Magnapinnidae, a newly discovered family of oceanic squid (Cephalopoda: Oegopsida). South African Journal of Marine Science20(1): 429–437. doi:10.2989/025776198784126340
^Young, R.E., M. Vecchione & K.M. Mangold (2000). Cephalopoda Fin Cartilage. Tree of Life Web Project.
^Young, R.E., M. Vecchione & K.M. Mangold (2001). Cephalopod Fin Attachment. Tree of Life Web Project.
Cephalopodfins, sometimes known as wings, are paired flap-like locomotory appendages. They are found in ten-limbed cephalopods (including squid, bobtail...
A cephalopod /ˈsɛfələpɒd/ is any member of the molluscan class Cephalopoda /sɛfəˈlɒpədə/ (Greek plural κεφαλόποδες, kephalópodes; "head-feet") such as...
with a live animal." CephalopodfinFin and flipper locomotion Fish locomotion Polydactyly in early tetrapods RoboTuna Shark fin soup Tradeoffs for locomotion...
A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom. Many species of animals...
Pelvic fins or ventral fins are paired fins located on the ventral (belly) surface of fish, and are the lower of the only two sets of paired fins (the other...
bilaterally-symmetrical kite-shaped or diamond-shaped outline, as in leaves or cephalopodfins. In a type of arthritis called pseudogout, crystals of calcium pyrophosphate...
of the mantle or the apex of the united fins, whichever is longer. In Octopodiformes (eight-limbed cephalopods), the anterior edge of the mantle is not...
Bigfin squids are a group of rarely seen cephalopods with a distinctive morphology. They are placed in the genus Magnapinna and family Magnapinnidae....
Cephalopod attacks on humans have been reported since ancient times. A significant portion of these attacks are questionable or unverifiable tabloid stories...
class Cephalopoda with squids, cuttlefish, and nautiloids. Like other cephalopods, an octopus is bilaterally symmetric with two eyes and a beaked mouth...
v t e Fins, limbs and wings Fins Aquatic locomotion Cephalopodfin Fish locomotion Fin and flipper locomotion Caudal fin Dorsal fin Fish fin Flipper Lobe-finned...
(Vampyroteuthis infernalis, lit. 'vampire squid from hell') is a small cephalopod found throughout temperate and tropical oceans in extreme deep sea conditions...
appears as luminous spots on various marine animals, including fish and cephalopods. The organ can be simple, or as complex as the human eye; equipped with...
Fin and flipper locomotion occurs mostly in aquatic locomotion, and rarely in terrestrial locomotion. From the three common states of matter — gas, liquid...
relatives. Cuttlefish, like other cephalopods, have sophisticated eyes. The organogenesis and the final structure of the cephalopod eye fundamentally differ from...
ναυτίλος nautílos 'sailor') is an ancient pelagic marine mollusc of the cephalopod family Nautilidae. The nautilus is the sole extant family of the superfamily...
called squid despite not strictly fitting these criteria. Like all other cephalopods, squid have a distinct head, bilateral symmetry, and a mantle. They are...
in other cephalopods.[citation needed] Giant squid have small fins at the rear of their mantles used for locomotion. Like other cephalopods, they are...
appendicular skeleton supporting the fins. The fins are made up of bony fin rays and, except for the caudal fin, have no direct connection with the spine...
putative cephalopod Pohlsepia (however, no evidence of melanosomes were found in Pohlsepia, and some studies deny its affinity as cephalopod) - although...
closely related species. Bigfin reef squids are characterised by a large oval fin that extends throughout the margins of its mantle, giving them a superficial...
means of lateral lobes in a fashion reminiscent of today's cuttlefish. Cephalopods joined the ranks of the active swimmers (nekton) in the late Cambrian...
Megalocranchia abyssicola, in which case M. fisheri would become a junior synonym. Cephalopod size Allcock, L.; Barratt, I. (2014). "Megalocranchia fisheri". IUCN Red...
earliest known cephalopods. However, their morphology is strongly dissimilar to confirmed early cephalopods, and thus their affinities to cephalopods and even...
mako sharks are predators that feed on small schooling bony fishes and cephalopods. Whether this shark is capable of elevating its body temperature above...
Norman, Mark D.; Finn, Julian K. (2016). Cephalopods of the World: An Annotated and Illustrated Catalogue of Cephalopod Species Known to Date (PDF). Rome, Italy:...
the study of cephalopods. Cephalopods are members of the class Cephalopoda in the Phylum Mollusca. Some common examples of cephalopods are octopus, squid...
purpuratus) have their teeth and fin spines stained purple. Other prey items of adults include peanut worms, sea stars, cephalopods, and small bony fishes. Juveniles...
Global Information
