Carnictises are blind worm-like creatures with fleshy pink skin with black shell that they emerge out of when they sense prey. They have bristles around their necks with a mouth at the end of the neck. The mouth has two rings of teeth, and they are described as being similar to slugs and maggots.
The World of Kong states that the ancestors of Carnictis were intestinal parasites similar to tapeworms that lived in the guts of the large predators of Skull Island living off the devoured flesh of their hosts. The book further states that at some point in the history of these worms, they must have evolved so they could survive outside the intestinal tracks of their hosts. It is theorized that long-ago prior to the events of King Kong (2005), a predator similar to Vastatosaurus rex infected with the ancestors of Carnictis fell into one of the chasms of Skull Island. Upon the infected predator's death, the worms disgorged itself from its host and found themselves in the rich organic river found at the pit's base where they thrived, being warmed by the hot, geothermal water of the pits and living off the flesh of animals that fell into the pits. Eventually, these worms grew larger becoming Carnictis, the large size they have gained allowing them to overwhelm and consume live prey.
While for an adult Carnictis would die if it moved to cooler waters, or if their supply of carrion suddenly stopped, Carnictis eggs could combat this through their ability to lay dormant for decades until favorable conditions returned and hatch in those times. As adults, Carnictis formed a symbiotic relationship with the Arachno-claw, who laid their eggs in carrion for Carnictis to eat. When the eggs hatched, the spiders emerged from the Carnictis' rectum.
When the human crew fell into the canyon, numerous giant insects including Carnictises, Weta-rexes and Arachno-claws attacked them. Several Carnictises attacked Lumpy. He fought back and punched a Carnictis, but then a Weta-rex attacked him. That gave the Carnictises a chance to attack him. Lumpy then grabbed his machete. He killed two Carnictises. Then one Carnictis bit his leg, then another bit his arm as he tried to kill the other one, then another one bit his head from the behind, as they then tore him apart.
A Carnictis uses its tooth filled maw to attack its prey. It attaches to its prey with its maw then chews it up alive. When its attached to a victim, it can only be unattached either by killing it or somehow driving it away.
The maggot-like Carnictis were lurking in their chasm when sailors began to fall from the log above. They then began to make "Glup"ing sounds as they lurched forward to attack their prey along with a swarm of Arachno-claws. However, the sailors were able to survive by punching and shooting the creatures until they reached safety.
When the crew of the Venture fell into a deep chasm, the Carnictis crawled their maggot-like bodies out of the ground to make a move for the sailors. Jack Driscoll stabbed one with a stick to prevent it from getting to Lumpy and the body of his friend Choy. However, when Jack looked back to them, they were both being consumed by Arachno-claws. A Carnictis then tried to swallow Carl Denham's leg, but he was able to smash it with a club until it retreated. All the creatures of the pit then swarmed the few survivors, but were forced to retreat when they were rescued by reinforcements with firearms.
When the crew of the Venture was pushed by Kong into the Skull Island chasm, the Carnictis and Weta-rex came to prey on them. The Carnictis snaked their mouths out, and at least three of them began to eat their cook Lumpy alive.
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