[Order Teuthida, Suborders Oegopsina and Myopsina]
Squid are the largest and most mobile of the mollusks. Giant squid grow to over 33 feet from tentacle tip to tail and Colossal Squid can exceed 46 feet. These huge squid are suspected of being among the most intelligent creatures in the sea. They communicate with each other by rapid changes of skin color and pattern, but what these mean has not yet been decoded You will not be eating one of those because they live too deep to catch, and their flesh is laced with toxic ammonia anyway. Market size squid (different species) are, however, plentiful and good eating.
More on Shellfish.
Squid are Cephalopod mollusks (Cephalopoda) and related to Octopi but only at the Subclass level (Coleoidea) so it's not real close. They became a distinct line from other Cephalopods about 400 million years ago.
Squid is a favored seafood in Italy, Southeast Asia, and other countries with long coastlines, but has never been that popular with Americans. Once scarce, it can now be easily found in markets serving Philippine and other Southeast Asian communities.
Squid contain a sack of black ink which they use to create a screen when escaping from predators. In Italy the ink is used to dye pasta black, and it is used in Spain as a dye in some recipes. In North America the ink sack is usually removed before marketing, but you can get this ink from emporia selling Spanish food items.Varieties
In North America, squid are not marketed by variety, only by size. That limits you to choosing (by size) fresh, dried, or otherwise prepared.
All sizes of squid tubes, from 2 inch to 10 inch, are available,
cleaned, sometimes bleached, and sometimes scalded, Thaw and treat as
fresh squid with very brief cooking or a long simmer. The photo shows
a 10 inch squid body, split and flattened, a 6 inch squid body left as
a tube, but with fins removed, and a pile of tentacles from very small
Humboldt Squid - [Jumbo Squid, Jumbo Flying Squid; Pota, Diablo Rojo (Spanish); Dosidicus gigas]
This is the largest of the edible squid, growing to nearly 5 feet long and a weight of 110 pounds. It is not yet well known in North America, because its range was only between Peru and central Mexico. For reasons not yet known, it has recently expanded its range from the southern tip of Chile to Alaska. This is of great concern to coastal fisheries because the Humboldt Squid is a voracious predator that only Sperm Whales and very large fish like Swordfish are able to prey upon. LIke the Giant Squid, and unlike smaller squid, their sucker disks are lined with sharp, hooked teeth
These squid are judged to be at least as intelligent as dogs.
They communicate with each other by rapidly changing skin colors and
patterns, but what they are communicating is still unknown. There have
long been fisheries for this squid in Peru and southern Mexico, but
now in Chile, and a sports fishery in Southern California. More will
doubtless be established as the squid continues to expand its range
and population, and good harvests will be needed to keep them from
eating all the fish.
Squid is very high in selenium and high in phosphorus, riboflavin and vitamin B12.
Squid is high in cholesterol. That was once a big scare, but it is now known the body manufactures most of its own cholesterol and dietary cholesterol has little effect for most people. In fact, populations that eat large amounts of high cholesterol shrimp and squid tend to have a low incidence of coronary disease. Eating too little cholesterol is now suspected of having negative effects on health.