#hexanchiform

[unofficial-sean]

crab uber

[taxonomytournament]

Taxonomy Tournament: Cartilaginous Fish

Hexanchiformes. This order of sharks are the most primitive morphologically. It includes the cow shark.

Squatiniformes. This order is made up of the angelsharks, which have flattened bodies and broad pectoral fins, and are bottom-dwelling ambush predators

[fun-facts-with-ghost]

21st October 2022:

Friday Fun Fact Faction: 3 shark facts!

• Sharks don't have bones! Their skeletons are made up of cartilage, this helps them float easier and swim faster as they are much lighter. Despite not being bone these skeletons can still be fossilised much like human teeth can be (teeth are not made of cartilage though). Other sea creatures share this feature with sharks, for example rays and sawfish.

• The two biggest species of shark in the world (the basking shark and the whale shark) are both filter feeders! Despite their massive size (up to 8 meters and 10 meters long respectively) they do not hunt, instead they swim slowly with their mouths agape capturing microplankton or "inhale" a large cloud of plankton at once. The water in their mouths is then filtered past large gill rakers (which prevent food from escaping) and through their large gills.

• Most sharks have eight fins but some may have less! These consist of two pectoral fins, two pelvic fins, two dorsal fins, a caudal fin, and an anal fin. Though an order of sharks exists known as "hexanchiformes", they are primitive sharks and therefore have some undeveloped features such as having only one dorsal fin resulting in a total of seven fins. There are only seven extant (currently existing) species of hexanchiformes because of this, in this list are the frilled shark and the cow shark.

[sad-trash-pigeon]

sharks are an elasmobranch fish, a subclass of cartilaginous fish. there are eight orders, or families, of sharks that are categorized by their biology !!

shark orders within elasmobranchii:

classifications;

heterodontiformes(bullhead or horn sharks) - five gill slits, a dorsal fin with a strong spine and flat and sharp teeth in their mouth. an example of this is horn sharks.

orectolobiformes(carpetshark) - five gill slits, 2 spineless dorsal fins, an anal fin and spiracles(paired openings which take in water and ventilate the gills) near their eyes. an example of this is whale sharks.

lamniformes(mackrel sharks) - five gill slits, a large mouth with several rows of teeth, two dorsal fins, and anal fin and the ability to maintain a higher body temperature than the water around them. an example of this is great white sharks.

carcharhiniformes(ground sharks) - five gill slits, moveable eyelids which protect their eyes from injuries, two spineless dorsal fins, an anal fin and a large mouth with sharp teeth located behind their eyes. an example of this is hammerhead sharks.

squaliformes(dogfish sharks)- found in nearly every marine habitat, they have long snouts and a short mouth, five gill slits, two fins, and no anal fin. an example of this is spiny dogfish.

hexanchiformes(primitive sharks) - six or seven gill slits, one dorsal fin, an anal fin, thorny teeth and most live in deep cold water. an example of this is frilled sharks.

pristiophoriformes(sawsharks) - long snouts similar to saws, five or six gill slits, two dorsal fins, no anal fin, wide pectoral fins, transverse teeth and most of them live in tropical waters. an example of this is longnose sawsharks.

squatiniformes(angel sharks) - flattened bodies, a mouth with dermal flaps in front of a short snout, nasal barbels, eyes and a spiracle on the top of their head and no anal fin. an example of this is angel sharks.

*if any information is incorrect please tell me! i will correct it on here and on my research document :)

@tearsonthepage

[sharkie-malarkie]

MY ASK GOT EATEN?? NOOOOOOOOO

I asked for a type of shark but I forgot it's name it starts with an h (hexanchiformes) and doesn't even end with shark (hexanchiformes) it's just a word.. ANYWAYS!

MILK SHARK!!! Pease (HEXANCHIFORMES)

(I CANT SEND PICS CUZ IM ANON BUT IM MAKING THIS FACE https://pin.it/59v9wfswN )

-BAT!!!

OH MY GOSH IM SORRY BAT I DIDNT MEAN IT FORGIVE ME PLEASE

DYK…

hexanchiformes eat bony fishes, other sharks, rays, chimaeras, squid, crabs, shrimp, and carrion.

hexanchiformes maximum published weight is 1,300 pounds (590 kg).

hexanchiformes are a primitive order of sharks,that numbering just seven extant species in two families

milk sharks is a species of requiem shark, and part of the family, Carcharhinidae, whose common name comes from an Indian belief that consumption of its meat promotes lactation.

[sharkest-sharks]

Info dump to me about the sharkies I WANT TO KNOW 1. Most aggressive sharkie 2. Fastest Sharkie 3. Strangest sharkie 4. Oldest Sharkie 5. Smallest Sharkie 6. Biggest Sharkie 7. Slowest Sharkie 8. Cutest Sharkie 9. "Ugliest" Sharkie

heheheh i know all of this from the top of my head 🦈 🦈 🦈 🦈 🦈 🦈 🦈 🦈 🦈

Bull sharks! they're the most aggresive towards humans along with great whites and tiger shark

Shortfin makos!!!

This is more subjective and i'd say goblin sharks, frilled sharks and cookie cutter are probably some of the weirdest ones. Honorable mention: the helicoprion (extinct friend but he was so strange <33)

Okay so the shark that can grow the oldest is the greenland shark, they can reach more than 400 years old The oldest *species* is the frilled shark! Along with the rest of the hexanchiformes order (this are sixgill and sevengill sharks)

Dwarf lantern shark! he's just a leetol guy

Whale shark! it's also the biggest fish in general followed by the basking shark

Greenland sharks, they're just vibing in the water

Subjective again, small sharks definetly get to me. Spotted catsharks, zebra pups, and nurse sharks too

In general people will probably say goblin? I think they're really weird and that's the thing i like the most about creatures so <3

[precambrianhottopic]

pro tip if you have a favorite shark look up what order it's from :)) also put your favorite shark in the tags if you want :))

[averagedialtowner]

Sharks

Temporal range: Early Jurassic – Present

Clockwise from top left: spiny dogfish, Australian angelshark, whale shark, great white shark, horn shark, frilled shark, scalloped hammerhead and Japanese sawshark representing the orders Squaliformes, Squatiniformes, Orectolobiformes, Lamniformes, Heterodontiformes, Hexanchiformes, Carcharhiniformes and Pristiophoriformes respectively.

Scientific classification Edit this classification

Domain: Eukaryota

Kingdom: Animalia

Phylum: Chordata

Class: Chondrichthyes

Infraclass: Euselachii

Clade: Neoselachii

Subdivision: Selachimorpha

Orders

Galeomorphii

Carcharhiniformes

Heterodontiformes

Orectolobiformes

Lamniformes

Squalomorphii

Hexanchiformes

Pristiophoriformes

Squaliformes

Squatiniformes

Synonyms

Pleurotremata

Selachii

Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the Batoidea (rays and kin). Some sources extend the term "shark" as an informal category including extinct members of Chondrichthyes (cartilaginous fish) with a shark-like morphology, such as hybodonts. Shark-like chondrichthyans such as Cladoselache and Doliodus first appeared in the Devonian Period (419–359 million years), though some fossilized chondrichthyan-like scales are as old as the Late Ordovician (458–444 million years ago). The oldest modern sharks (selachimorphs) are known from the Early Jurassic, about 200 million years ago.[citation needed]

Sharks range in size from the small dwarf lanternshark (Etmopterus perryi), a deep sea species that is only 17 centimetres (6.7 in) in length, to the whale shark (Rhincodon typus), the largest fish in the world, which reaches approximately 12 metres (40 ft) in length. They are found in all seas and are common to depths up to 2,000 metres (6,600 ft). They generally do not live in freshwater, although there are a few known exceptions, such as the bull shark and the river shark, which can be found in both seawater and freshwater. Sharks have a covering of dermal denticles that protects their skin from damage and parasites in addition to improving their fluid dynamics. They have numerous sets of replaceable teeth.

Several species are apex predators, which are organisms that are at the top of their food chain. Select examples include the tiger shark, blue shark, great white shark, mako shark, thresher shark, and hammerhead shark.

Sharks are caught by humans for shark meat or shark fin soup. Many shark populations are threatened by human activities. Since 1970, shark populations have been reduced by 71%, mostly from overfishing. Sharks are spread across 512 described and 23 undescribed species in eight orders. The families and genera within the orders are listed in alphabetical order.

I LOVE YOU THANK YOU /P

[iwannabeasixgillshark]

There is something sweet and special when someone shares with another what they love. There is potency there that exists in no other form of emotion. You don't even need to fully understand to appreciate the adoration one holds for any number of subjects. It shines through like a fire behind stained glass; coloring your world with their light. And even when they're done talking, one would be forgiven for being dazzled, for you have seen passion in the flesh and felt its warm caress. It is more precious than any diamond and more nourishing than the finest foods. It transcends description; it is neither scientific, nor spiritual. It is the most human ability we possess: to love.

What do you love about sixgill sharks?

Honestly, at first I just really loved their silly little faces. I was just starting to really do research on sharks (which is a topic I’d wanted to learn abt for years at that point) and I found hexanchiforms, which I thought was super cool just cause they were so unique. And then I think I saw a video of a sixgill, and I was just like WOW they’re big but also they look so baby?? I was obsessed with their big eyes and the fact that they always have this goofy little smile on. And honestly, I don’t think I’ve ever seen a video clip of a sixgill that didn’t end with it ramming it’s face into a completely avoidable obstacle. I love them.

There’s just something that is really satisfying to me about the way thwyre shaped and they move. All of the adaptions they’ve taken on to live in the deep sea is so fascinating, and also the fact that they’re still really close to prehistoric sharks and they’ve barely evolved in millions of years?? That’s fucking insane, I can’t even imagine being so perfectly adapted to an environment you don’t change and don’t move for hundreds of thousands of years.

I watched this documentary on them a while back too which is really good (I’ll link it if can find it) abt the sixgill population in Seattle, and all the research done on them too. Sharks have such interesting social lives that I feel like are really undocumented, and sixgills especially dont have a whole lot of easily accessible information on them. I’d love to study them sometime — and if not study, at least dive with them. They’re so majestic (but also so silly and goofy at the same time) and I just. Hmgnenghgm. They’re just so cool to me

[justanotherinterneruser]

good evening !!

i finally found your tumblr (im not a stalker i promise) and i just wanted to pop over and say hi!!! i love your works more than life itself and i hope you know how appreciated you are :3

anyway if you could be any sea creature what would you be and why i would be one of those long squids that live in the bottom of the ocean because they're creepy and weird and funny looking (affectionately)

GOOOOOOOOOOOOOOOOOOOOSEBERRY!!

HULLO!!! Good to see ya!!! Thank you so much for saying hi and saying such nice things because I may or may not be snuggled in bed a little weepy over your words 😭❤️. I am so glad you enjoy my silly little drivels of nonsense

If I was to be a sea creature I would want to be a Hexanchiformes because they are some WACK lil guys or I’d be a Greenland Shark because they are round funky dudes

[unofficial-sean]

@ everyone asking me to not eat the internet cables:

[somefuckingguysblog]

I wanted to redo this since I kinda hate how it originally turned out, sooo I'm redoing it! This is kinda just some general info about me and my current intrests.

Hi! My names Cedric or Jay, and I'm a Nonbinary/Transmasc/Agender Aroace man living in Texas. My intrests switch out often but right now my intrests are goth fashion/music, the Saw movies, Marble Hornets, Spider-man, and the band Ghost. I also really like folklore, deep sea sharks(specifically Hexanchiformes), vampires and werewolves. The tags have the rest of my intrests if you're curious! I also have a carrd for more info!

DNI ꒷꒦

proshippers/antis, pro para/pro contact, pedos/zoos, speeding bullet fans(TF2), hetalia fans, ship Magnus with anyone but MMA(Metalocalypse), Hazbin hotel/helluva boss fans, vizipop supporters

socials ꒷꒦

Instagram: somefkingguy

Twitter: somefuckingguy9

Tiktok: ._ghxul._

Spacehey: somefuckingguy

Pintrest: somefckingguy

[cvrsedbody]

Also thinking the best shark bracket reboot will be split up by order (carcharhiniforme, hexanchiforme, etc) and then the winner in each order will be put into a final ultimate Shark duel against the other winners. Anyone have any thoughts about that?

[llatimeria]

you’d think the fact that i use both “squaliformes” and “frillshark (frilled shark)” would mean that frilled sharks are a kind of squaliforme. nope! squaliformes are a completely different order of shark. i just happened to get this one very specific canon biology url 

[nature-and-biodiversity-blog]

Frilled Shark Chlamydoselachus anguineus

[coquizvazquezarts]

#tiburones Los tiburones han existido por mucho tiempo, los primeros  que se conocen  evolucionaron hace unos 400 millones de años. Son de diversos tamaños, comportamientos, y hábitats; algunos de ellos poseen formas similares a los submarinos y torpedos, otros, son de cuerpo compacto en forma de huso. Poseen pequeñas escamas en sus cuerpos,  del tipo placoideo; además, su dentadura varía en forma y tamaño, lo que sirve para identificar familias y especies distintas. La dentadura de los tiburones la conforman  dientes puntiagudos y muy filosos, arreglados en hileras; donde cada diente perdido es sustituido por otro, en periodos de una a dos semanas e inclusive pueden mudar dientes e hileras completas en periodos de uno o dos meses, dependiendo de la especie. Las mandíbulas también son de cartílago, lo que les permite una mayor apertura para atrapar a las presas, mientras que la lengua se contrae para formar un vacío que succione a la presa, lo que le permite mantener a la presa en posición para el ataque. Los orificios nasales, son estructuras muy sensibles encargadas de la detección de olores, poseen de 5 a 7 aberturas branquiales de cada lado; el agua entra por la boca y sale por las aberturas, de modo que el intercambio gaseoso se lleva a cabo dentro de las branquias, en los filamentos branquiales (respiración). Los peces poseen vejigas gaseosas que les ayudan a flotar en la columna de agua; mientras que los tiburones poseen un hígado muy graso, el cuál tiene la misma función. La madurez sexual la pueden llegar alcanzan alrededor de los 20 años, aunque en la gran mayoría es antes. La forma de diferenciar entre las hembras y los machos es la presencia de unas estructuras reproductivas llamadas “claspers”. Los claspers son modificaciones de la aleta pélvica y cada macho posee 2 de estas estructuras en cada aleta pélvica, que sirven para la transferencia del esperma a la hembra. #biología #biology #dibujo #FCB #datosinteresantes #squaliformes #hexanchiformes #tintachina #marinos #pecescartilaginosos https://www.instagram.com/p/CZ5oauWLY6M/?utm_medium=tumblr