Search results
Results from the WOW.Com Content Network
Squids are the primary sufferers of negative buoyancy in cephalopods. The negative buoyancy means that some squids, especially those whose habitat depths are rather shallow, have to actively regulate their vertical positions. This means that they must expend energy, often through jetting or undulations, in order to maintain the same depth.
This buoyancy system is unique to the family and is the source of their common name "bathyscaphoid squid", after their resemblance to a bathyscaphe. Often the only organ that is visible through the transparent tissues is a cigar-shaped digestive gland , which is the cephalopod equivalent of a mammalian liver .
Most cephalopod dermal structures take the form of tubercles, and these are the only cartilaginous dermal structures (the various "dermal cushions" being composed of other forms of connective tissue). All three main types of cartilage found in vertebrates are represented among the different squid species: hyaline, elastic and fibrocartilage.
Spirula spirula is a species of deep-water squid-like cephalopod mollusk. It is the only extant member of the genus Spirula, the family Spirulidae, and the order Spirulida. Because of the shape of its internal shell, it is commonly known as the ram's horn squid [3] or the little post horn squid.
Cuttlefish, or cuttles, are marine molluscs of the suborder Sepiina.They belong to the class Cephalopoda which also includes squid, octopuses, and nautiluses.Cuttlefish have a unique internal shell, the cuttlebone, which is used for control of buoyancy.
The squid go where the small bait fish go. If there is abundant food, they will come and stay. If there is abundant food, they will come and stay. However, squid fishing as a pursuit can be ...
The squid floats along the water upside down with one eye aimed at the ocean floor and the other looking above. ... The cephalopod’s right eye is small and dark, while the left eye is larger and ...
Negative buoyancy (i.e. the ability to float) [clarification needed] would have come later, followed by swimming in the Plectronocerida and eventually jet propulsion in more derived cephalopods. [11] However, because chambered shells are found in a range of molluscs – monoplacophorans and gastropods as well as cephalopods – a siphuncle is ...