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Limbs of the Cephalopoda
Whether squids, octopuses, and nautilus have “arms” or “tentacles” is often simply a matter of semantics, but the most accepted definitions (from what I’ve found) tend to define the “arm” as a tapered limb, with two rows of suckers along its entire length. “Tentacle” is typically a length of tapered limb with no suckers, leading to a distal club-like appendage, covered in suckers.
One exception would be limbs in the nautilus - they have up to 90 un-suckered limbs, but their limbs are called “tentacles” by those who study them, even without the terminal club.Images:
Top right: Octopus vulgaris and detail of beak and arms
Top left: Detail of tenticular clubs in squid, from the Expedition of the Valdivia
Bottom right: Arm of Illex illecebrosis (Northern Shortfin Squid)
Bottom left: Tentacle of Illex illecebrosis
Japetella diaphana tentacles and buccal cavity
Japatella diaphana is an octopus member of the Bolitaenidae family, and like the other members of its family, is very small - 12 cm long at most. They live, eat, and breed in the pelagic zone of the ocean, unlike deep-sea squid, which rarely spend their entire lives at such depths.
Mature females have a bioluminescent photophore encircling their beak.
Die Cephalopoden. Ewald Rubasmen, 1910.
(via scientificillustration)
(via If Style Could Kill)
Designed by Christian Tse x Gourmet
