Pyjama Squid (Sepioloidea lineolata), approx 4cm., family Sepiadariidae, South Australia - Night dive
photograph by Steve Jones
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Striped pyjama squid (Sepioloidea lineolata)
The striped pyjama squid, found in Australia, is not a squid, but a cuttlefish.
(Image credit: Andrew Trevor-Jones via Alamy)
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The best time to wear pyjamas is all the time… just ask the striped pyjama squid (Sepioloidea lineolata)! Despite its common name, this critter is actually a cuttlefish—and it’s one of the few poisonous cephalopods known to science. When threatened, it can change color and secrete slime to intimidate foes. It typically spends its days nestled beneath the sand, rising at night to hunt for small shrimp and fish. This species inhabits shallow waters around Australia, including near the Great Barrier Reef.
Photo: katewolny, CC BY-NC 4.0, iNaturalist
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Today's cephalopod weirdo: The Pyjama squid
No, it's not a melting scoop of stracciatella ice cream. It's the Pyjama squid (Sepioloidea lineolata)!
Like their cousins the bobtails, they often bury in the sediment. They're in the order Sepiida, which includes bobtails, cuttlefish, bottletails, and these cuties.
Some articles on the internet will say stuff like "These animals are technically cuttlefish" and... listen... I don't know who said that, but whoever said it is wrong, and now sources all over the damn internet are repeating it, and like... I shouldn't let it bother me, ya know? But it does, unfortunately, make me feel like my eyeballs are going to fall out of my head.
Because words MEAN something, you know? And the word cuttlefish means an animal with a cuttlebone in it. The cuttlefish are a distinct bunch of critters. Their fins go around their whole bodies*, they have W shaped pupils, but most critically, they have a buoyancy device called a cuttlebone. That cuttlebone keeps them neutrally buoyant- so they neither float nor sink. They just chill. They're able to control the buoyancy with gas exchange between their blood and the little gas chambers in that cuttlebone. The other members of the Sepiida, the bottletails, pyjama squid, and bobtails, they don't have any of that. Sure, they're totally, 100%, most closely related among the cephalopods to cuttlefish, but... cuttlefish... are their own little group within that branch of the family tree.
*Ok to be fair, it's very easy to confuse cuttlefish and reef squid, but that's a whole other post.
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Invertober Day 28: Striped Pyjama Squid (Sepioloidea lineolata)
[Image ID: A digital painting that is a close up of a Striped Pyjama Squid, as the name suggests it is striped. It takes up a majority of the piece and is tilted to the right. The squid is a round shape. It is green and mint with purple stripes, and purple pupils. Portions of its eyes are yellow. It is on a background that alternates shades of pale green. End ID.]
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Striped Pyjama Squid aka Striped Dumpling Squid (Sepioloidea lineolata) mating, Indo-Pacific region
photograph by Scubagirl85 | Wikipeda CC
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Invertober 2023!
Invertober is back! The (mandatory) drawing challenge where you draw an invertebrate every day. It's for everyone and *mandatory.* Last year they had no ants on the list! I was very upset... this year there is one ant... an improvement, still so much more room to grow!
Let's shoot for 10 ants next year.
OK here is what you need to draw each day for the month:
Sunburst diving beetle (Themanectus marmoratus)
Silvery leaf cutter bee (Megachile leachella)
Little fire ant (Wasmannia auropunctata)
Emerald green snail (Papustyla pulcherrima)
Citrus root weevil (Diaprepes abbreviatus)
Coconut octopus (Amphioctopus marginatus)
Common banded hover fly (Syrphus ribesii)
Calico Crab (Hepatus epheliticus)
Elephant hawk moth (Deilephila elpenor)
Periodical cicada (Magicicada septendecim)
Fruit fly (Drosophila melanogaster)
Eelgrass isopod (Pentidotea resecata)
Devastating grasshopper (Melanoplus devastator)
Blue glaucus (Glaucus atlanticus)
Owlfly (Libelloides macaronius)
Fuchsia flatworm (Pseudoceros ferrugineus)
Blue morpho (Morpho peleides)
Reddish-brown stag beetle (Lucanus capreolus)
White-spotted jellyfish (Phyllorhiza punctata)
European mantis (Mantis religiosa)
Pink crab spider (Thomisus onustus)
Red velvet ant (Dasymutilla occidentalis)
Asian forest scorpion (Heterometrus spinifer)
African monarch (Danaus chrysippus)
Horned sea star (Protoreaster nodosus)
Torpedo bug (Siphanta acuta)
Iceland scallop (Chlamys islandica)
Striped pajama squid (Sepioloidea lineolata)
Tiger centipede (Scolopendra polymorpha)
Leopard slug (Limax maximus)
Halloween pennant (Celithemis eponina)
Let's goooo!
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Doc! I have found my new favorite sea critter... The sepioloidea lineolata/striped pajama squid! IT LOOKS SO SQUISHY! I'M GONNA DIE!
They are really cute
But I raise you
"Opisthoteuthis Adorabilis"
Also called the flapjack octopus
-Jotaro
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The Striped Pyjama Squid (Sepioloidea lineolata)
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タテジマミミイカダマシ Sepioloidea lineolata
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