Of the various forms of Palthes that have been found among the oceans of the moon despite being considered as some of the most complex creatures found out of earth so far, of what regards intelligence they tend to be quite rudimentary in their cognitive abilities, i.e., do not possess what could be high thinking abilities only with mostly instinctive behaviors or basic reactions to external stimuli like many earth animals, this probably because of the habitable conditions of the environments that these organisms confronts that doesn't support high cognitive organisms.
However, in certain regions where hydrothermal vents have managed to establish a thriving ecosystem tend to host the ideal conditions to gather what could be said to be the closest thing to an intelligent creature that Europe has had. Living among the skeletons of the great reefs of vermiform creatures that grow on the slopes of the chimneys, where the greatest amount of biodiversity feeds on the residues of the rich chemical soup, some creatures no larger than 20 cm in length meander through the labyrinth of branches of the reefs, these are Palthes of the Lobatocauda type known as Tachybrachia, of the variety of flexible tail which belongs to a little peculiar clade that have a marked morphological variation, it belongs to a clade that has greatly modified 3 of its four arms, developing them in special organs able to amplify and conduct the electricity they generate with special muscles near the tail, their appearance is much more similar to that of a chordate, with an almost defined and long tail with the semi-curved end, a head and a more prominent jaw and not hidden, and having its fourth arm modified to grasp like a large proboscis that stays above of the head. From what can be inferred from several of its relative is that these developed these long electric tentacles for self-defense and also as a method of attack, to stun smaller prey, however this species has gone a little beyond in the use of these just for offensive/defensive actions. From what has been seen of these, when encountering individuals of the same species tend to extend these arms to the sides as far from one another, and during this time they begin to generate small and varied pulses of energy in a specific order, being controlled and with a pattern, being a type of communication. Depending on the action, they may react in different ways, from affection, acceptance, aggressiveness, and condescension, showing some sort of high developed communication with the ability to recognize such stimuli and give it a respective answer.
This species was named as the Clarke's Tachybrache (Electrobranchius clarkei), in honor of Arthur C. Clarke and his novel 2010: Odyssey Two where Europe is able to host life and intelligence because Jupiter becomes a star. The small Palthes are inhabitants of the most conglomerate areas of the called "Vent reefs", living in the interior or between the spaces of these, being able to slide through the holes and crevices with few problems, they establish in a specific area of each reef that protects, gathering in a group of around 15 individuals. Its behavior is an impressive aspect not seen in another species including relatives of its own clade this complex, showing cooperation and reactions with purpose, almost similar to that of certain cephalopods. They are mainly omnivores, feeding on both live prey as carrion which can tear with its 6 hook-shaped mouthparts that are inside the mouth. Its large arm with 4 long finger-like appendage tend to be used both to grasp prey and to interact with individuals by touches and caresses.