Indie Squid Kid

3. Magnapinna sp.

Pacific Bigfin Squid, photo by Richard E. Young (from tolweb.org)

Rare and poorly understood, Bigfin Squid were first formally defined in the 1990’s (although a single damaged specimen discovered in 1907 —M. talismani—has been subsequently assigned to the genus). Species of Magnapinna are characterized by small heads, large eyes, and very large fins that extend well beyond the posterior tip of the mantle. Almost all specimens described to date have been paralarvae or juveniles, and the adult forms are officially unknown. However, on multiple occasions in recent years, ROV submersibles have captured footage of a previously unknown large squid that is suspected to be the adult form of Magnapinna. Also known as the Long-arm Squid, these mysterious cephalopods are unlike anything previously observed.

photo by NOAA (from Wikipedia)

Its arms and tentacles (which are of equal length) are held perpendicular to the body and then angle downward (sometimes at 90°) at strange “elbows.” The relative length of arms/tentacles to the body is greater than in any other known squid (15-20 times the mantle length), and the total length of the animal is estimated to be as much as 8 meters (~26 feet). The Long-arm Squid has been observed in the Gulf of Mexico, the Indian Ocean, waters off Ghana and Brazil, and, as seen here, Hawaii.

1. Taningia danae (Dana Octopus Squid)

photo by Michael Vecchione (tolweb.org)

T. danae is the sole species of the genus Taningia, and it is one of the largest known species of squid. It can attain a mantle length of 1.7 meters (5.58 ft) and weigh up to 61.4 kg (over 135 lb). (The specimen pictured above has ML of just over 1 meter.)

Apart from its impressive size, Taningia has many distinctive characteristics. The common name “Octopus Squid” (which also applies to the other species in the family Octopoteuthidae) reflects that adults only have eight arms, having lost their two tentacles during development. Two of these arms are tipped with large photophores. These light-emitting organs have muscular lids, giving the squid the ability to produce intense flashes of light when it attacks its prey. T. danae also has exceptionally large, muscular fins, which are fused on the dorsal midline and are nearly the length of the mantle.

In 2005, live footage (including the video below) of the the Dana Octopus Squid was shot by Japanese researchers at depths of 240-940 meters off the Ogasawara Islands in the North Pacific.

Additionally, here is another video that shows a squid that looks very much like Taningia danae that has attached itself to a light on a deep sea oil rig.

5. Watasenia scintillans (Firefly Squid)

photo from Wikipedia Commons

Also known as the Sparkling Enope Squid, W. scintillans is a small squid (~3″ long) found only in Japanese waters, where it is fished commercially. It is known for spectacular displays of bioluminescence and has 2-4 large black photophores on the tips of certain arms, 5 on each eyeball, and a galaxy of tiny photophores covering its body. The Firefly Squid is also the only cephalopod known to have color vision, possessing three visual pigments and a double-layered retina.

The video below is a clip from a Japanese talk show, and it features three different types of glowy sea life: Firefly Squid, bioluminescent plankton, and bioluminescent comb jelly. The squid part goes by pretty fast, but you get a good look at a school of W. scintillans all lit up!

After a brief pause to attempt (unsuccessfully) to recover from yet another mysterious “flu-like virus” (my third since October), the Sensational Squid Countdown resumes! If you are just joining us, here’s what we have so far…

10. Sepioteuthis sepioidea (Caribbean Reef Squid)

9. Dosidicus gigas (Humboldt Squid)

8. Promachoteuthis sulcus (”Lolsquid”)

7. Helicocranchia sp. (Piglet Squid)

6. Histioteuthis sp. (Jewel Squid)

H. cerasina - photo by Richard E. Young (from tolweb.org)

The Jewel Squids get their name from the distinctive large integumental photophores that make it look as though they’ve been run through a Bedazzler. They are moderate sized squid with long arms and short mantles (up to 33 mm long) with very small fins at the posterior tip. They are also commonly known as Cock-eyed Squid because their eyes are different sizes—the left eye is significantly larger than the right, is semitubular (not hemispherical), bulges out of the head, and is directed vertically, pointing up toward the surface.

S. hoylei - photo by R. Young

Depending on who you ask, the family Histioteuthidae contains either one or two genera, and up to 19 species. Some researchers place three of the species in the genus Stigmatoteuthis, which is distinct from Histioteuthis by the presence of even longer arms (relative to mantle length) and paired secondary reproductive organs.

Histioteuthids are oceanic squid found world-wide at depths of around 2500 ft. They have often been observed from submarines with their arms curled up over their heads in a way that give the appearance that the arms are tied in knots.

The next two squids in the countdown are not very well known, but both have achieved a small degree of Internet fame…which is similar to actual fame only not nearly as impressive.

8. Promachoteuthis sulcus

photo by R. Young (from tolweb.org)

P. sulcus is known from a single specimen collected in the south Atlantic at a depth of 1759-2000 meters. The holotype* is an immature female with a mantle length of 25mm. Its diagnostic characteristics include tentacles that are thicker at their base than the arms, and arm suckers that are bigger than the suckers on the tentacle clubs. However, the thing that got this obscure little squid noticed was this photo of its mouth, showing what seem to be disturbingly human-like teeth.

*A holotype is a single example of a specimen used to formally define a species.

photo by Richard E. Young (from tolweb.org)

These “teeth” are actually the circular, folded lips that surround the squid’s beak (which isn’t visible in this photo). Not long ago, this photo started making its way around the Internet, eventually getting the inevitable Lolcat treatment. Like so…

Considering that P. sulcus doesn’t have a common name yet, I think “Lolsquid” would be quite fitting.

7. Helicocranchia sp. (Piglet Squid)

H. pfefferi - photo by Richard E. Young (from tolweb.org)

Piglet Squid belong to the Cranchiidae (aka cranch squids, aka glass squids), a family of squids that include some of the smallest and largest known cephalopods. There are at least three species of Helicocranchia (although there may be as many as 14), and these small (mantle length ~100 mm) oceanic squids are found in tropical and subtropical waters world-wide. They are characterized by extremely large funnels that extend beyond their beaks and which resemble the snouts of pigs (hence the common name). Additionally, their arms jut out over the eyes like a shock of hair, and they have very tiny, and adorable, paddle-shaped fins. (Inset photo of Helicocranchia sp. by SERPENT Project.)

Basically, they look like Pokémon.

Helicocranchia, I CHOOSE YOU!

9. Dosidicus gigas (Humboldt Squid)

photo by Sheraz Sadiq (from Flickr/kqedquest)

The Humboldt Squid (aka the Jumbo Squid, aka the Jumbo Flying Squid, aka Diablo Rojo, aka the Red Devil) was the star of the minor, and poorly researched, media frenzy this past Summer that I like to call Squidvasion! 2009. Although there’s no excuse for lazy science reporting, I can understand the impulse to occasionally over-sensationalize an animal as cool as Dosidicus gigas. They can grow up to 7 ft long and posses tentacles with razor-sharp suckers for crying out loud! They also have the ability to instantly change their color from white to a deep blood-red, and, as the name “Jumbo Flying Squid” suggests, they have been known to eject themselves out of the water to avoid predators. Humboldts are the most common species of large squid, at least of those that we are able to easily observe. They travel in large shoals of up to 1,200 individuals and come to the surface at night to feed. Their vicious and voracious reputation has probably been a wee bit exaggerated, but I would still think twice before going swimming with a thousand man-sized predatory squid! Of course it would be another story completely if I had a suit of anti-squid armor!

This video by KQED, starts off a little on the cheesy side (and features a talking head that insists on calling them “fish”), but that soon gives way to a very informative and level-headed look at the biology of D. gigas and how its recent expansion of range may be connected with global climate change. Of course the best part is all the excellent footage of Jumbo Squids in action!

Last year, for Cephalopod Awareness Day(s), I did a post called Eight Awesome Octopuses! where I profiled eight types of octopus that I find particularly fascinating. My original plan had been to do a similar post on squids, but that wasn’t in the cards at that time. Cephalopodmas, too, came and went, but still there was no time! So now, at long last, squids finally get their day. Actually, they’ll get a whole week…maybe two.

So, without further ado, let’s begin the countdown of my (current) favorite squids.

10. Sepioteuthis sepioidea (Caribbean Reef Squid)

photo by Clark Anderson/Aquaimages (from Wikipedia)

S. sepioidea is commonly found in shallow coral reef environments from Florida through the Caribbean Sea in small schools of 4-30 individuals. Adults are 12-20 cm long, and they typically exhibit a mottled brown coloration, although, like most cephalopods, reef squid are covered in chromatophores that allow for rapid and complex color changes. With fins that extend almost the entire length of their broad mantles, they strongly resemble cuttlefish, and, in fact, Sepioteuthis essentially means “cuttlefish squid.” There are at least two other species of Sepioteuthis: S. lessoniana (Bigfin Reef Squid) from the Pacific and S. australis (Southern Reef Squid or Southern Calamari) from the waters off Australia and New Zealand.

The Caribbean Reef Squid happens to be the only species of squid I have personally encountered in the wild. For most of my life I’ve been an armchair amateur marine biologist, but in 2002, while honeymooning in St. John (U.S. Virgin Islands), I finally had the opportunity to do some snorkeling. I saw stingrays and spotted eagle rays, green sea turtles, and a plethora of tropical fish (including a frighteningly huge barracuda), but the highlight was a small school of reef squid. I’m not a particularly skilled photographer even on land, so the few shots I got with my cheapo underwater camera are not anything special. Yet, they are proof that I’ve actually swum with squid, so here they are!