Wraithoids

You can imagine how shocked the people controlling the rover where. Just landed a rover successfully on a dwarf planet that could possibly have life (Chiron), found a neat slime mold and then this thing emerges from the darkness.

Pop culture
The wraithoid has become a symbol for pseudoscience. The formation of a humanoid just can't be an accident, apparently. Creationists say this is God's backup of humanity, pointing out the resemblance to a human fetus. Believers of greys say these where abducted human, abandoned on Chiron. But the resembles is only superficial, and most of these people haven't read enough about this species to know how different we are.

Biology
Wraithoids have reduced muscle mass, unable to support there own bodies on most planets, but for Chiron, it's great. Chiron has less gravity than the moon. The skeleton is not ossified, allowing it to bend. This helps with slinking through cracks in the rock and not braking everything when missing a jump. Combined with the low gravity, They can make some impossible parkour and run, jump and climb with easy.

Most creatures on Chiron are arthropod-like scudlers with a haemoceol (one large blood sack instead of a vein structure). The wraithoids take advantage of this system. At the back of their throat, they have a long, tubiler tongue, through which they eat. They stick the sharpened end in between the plates of their pray and suck out all of the blood.

Hunting looks more like scouting. The wraithoids runs around on all fours. That is how they move most of the time, only standing up straight when looking around. When they have found something not to gigantic, they pounce onto it's back and either shake it until it stop moving or grab the back of it's head and smash it into the ground. Then the bipedalism really shines as the wraithoid picks up it's meal and goes looking for a safe place to feed. It basically sacrifices it's climbing and jumping power for shelter.

Reproduction
when a male and a female find each other suitable for mating, the male coughs his semen onto the female and smears it over the belly. There it soaks into the skin and fertilizes the egg cells in the females skin. The male then leaves the female to care for the crotch goblins. The young eat there way out of the skin and secure themselves into the belly, with there head just sticking out. This hurts like hell, but the female doesn't complain.

From this point on, the female hunts twice as much, just drinking one normally. The other is juiced like an orange. The female pours the blood over her chest, letting her babies lick it up. This goes on until the young are so big, they crush their mothers organs, killing her. For them, that is the sign to leave and run on their own.