The ocean

Cephalopods

April 17, 2020 /

It’s a disease honestly to focus on one thing. A dreadful zeal that encompasses me as I observe any cephalopod disappear, singling it from an entire population of marine animals. I should most probably extend my horizon.

Although, the thing is there is a reason they talk about the octopus so fondly; From the Viking myths of the Kraken to John Oliver on his late-night show, people really do adore a cephalopod. It is an infatuating little thing.

Whenever I go to the ocean, it is all I look for because spotting a cephalopod is an indecipherable treasure.

Cephalopods are a class under the phylum Mollusca.  Molluscs consists of shelled invertebrates and invertebrates who lost their shell. When one examines what lies in the phylum Mollusca, it is slugs, clams and snails. These are slow or immobile creatures, and then, on the other hand, you have cephalopods, creatures who used to be at the top of the marine food chain for a while back before the Cambrian extinction.

Cephalopods class contains Nautiloidea (nautilus) and Coleoidea (octopuses, cuttlefish and squids) subclasses. Nautiloidea is an ancient specimen, evolving from the early ammonites and existing since the late Triassic with only one remaining family (six species): the chambered nautilus.

Coleoidea is more abundant, infamous for its ferocious species and recalled prominently when the class ‘cephalopod’ is stated. In addition, it has a more complex nervous system and understanding compared to the scavengers, the chambered nautilus.

Nautiloidea

Evolution

The nautilloids evolved from early Cambrian molluscs which were mainly immobile dating at 540 million. The species orginally started out as small as planktons and measured in mm although with the end of the ice age

 

Anatomy

Unlike Coleoids, Nautiloids do not have tentacle or arms but have cirri. These are rather slender, sucker-less parts that can be up to 90 in a single  Nautillus. 

 Nautiluses do not have good vision, unlike many other cephalopods. Due to their lack of variation and evolution their eye structure lacka solid lense. They have a simple “pinhole” eye through which water can pass. (kinda cool that water passes through their eyes). Instead of vision, the animal is thought to use olfaction (smell) as the primary sense for foraging, as well as locating or identifying potential mate. One distinguishable charcateristic that cephalopods have order ( nautilada, octopoda, sepiida, myposida etc.) is the shape of their eyes which suprisingly different.

Help yourself to the knowledge that might pang once you dive down in the depths. Go enlighten yourself with the taste of the salty sea, here you might actually find what it is capable of and what it contains.

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