Oliganae

Oliganae are a family under Parvenatora and are distinguished by their body shape, which includes a long, ovaloid body with a mouth at the front and a varying amount of tentacles in the back, the middle of which is always longest and is used for ejecting extaca. They are named after the Latin word for squid, lolligo and the singular is Oligan.

Anatomy
The anatomy of all Oligans includes three main body parts: the head, the torso, and the tentacles. The head is the part that contains the Oligan's mouth, brain, heart, and gemani (singular geminas, derived from Greek words gematos and pnevmonas, meaning full and lung respectively). Gemani are organs that perform the same function as lungs or gills, filtering water absorbed through microscopic pores in the skin out, and absorbing air. They do so through selective diffusion, letting water out and in, and letting oxygen in without letting it out. Rather than their gemani being hollow like lungs on Earth, they are solid all the way through, and keep in air using their sponge-like absorbance. To keep the Oligan from floating up because of this, they have four gemani, organized in a circular pattern in the Oligan. Only two of the four gemani will keep in air at a time, while the other two absorb water. Because of this, Oligans, like most other Parvenatores, are considered to be radially symmetrical. The brain of the Oligan is relatively simple, as it allows for the function of all of the body parts, but Oligans do not have complex cognitive function. Oligans' hearts are also simple, having no special abilities from most other "animals".

The torso contains only one special organ, and three main other things: fat to keep the body warm, primitive veins to allow the transfer of blood throughout the Oligan, and tube-like structures that carry water from the pores in to the gemani and back out. The blood of Oligans is orange because of the chemical they use for oxygen transfer, known as hemokalanin. The one organ that is contained in the torso is the extaperante (derived from Latin word operante, meaning producer, and English word extaca), which all Limusans (phylum Limusa) have. It is situated near the center of the Oligan, closer to the tentacles as to more easily eject extaca.

The tentacles are long appendages at the end of the Oligan, used for locomotion. They are regularly moved in a slow back-and-forth motion to keep the Oligan moving, but when the Oligan is threatened by a predator or other cause, it will begin to move them in a fashion more similar to that of a squid on Earth to escape faster. The number of tentacles varies between species, but all have a singular noticeably longer tentacle that is used to eject extaca when a predator comes nearby. It is internally attached to the extaperante, and can be aimed in almost any direction, able to sense where a predator might be based off of subtle movements in the water.

Genera under Oliganae:

Plumasa (Feathered Oligans)

Calvitius (Hairless Oligans)

Trichota (Haired Oligans)