Among the pseudoarthropods exists a clade that surely has some of the weirdest creatures so far discovered on Silvanus. Because early exploration took mostly place in the equatorial regions there was little known about these animals that live mostly in the polar forests. Fetucervus is a rather common member of this clade called, Stromaltrices. When fully grown their antlers span over 80 cm or more. What looks on first glance like a display structure or weapon is actually reproductive organ. Both sexes grow these structures and both sexes give birth through them. Males as well as females have mobile reproductive cells which they exchange. In a chamber in the throat the fertilization happens, the male reproductive cells lose their mobility in the process. The fused cells are pumped up into the antlers and begin a race to their ends to nest themselves into placenta like tissue.
The ends of the antlers begin to form dark, egg like capsules in which the young antler spawner grows to a certain size.
When they hatch they look very different compared to the adults, the crack open the shell and begin to inflate huge throat sacs with light gases. Floating in the air they maneuver with feather like forelimbs. Their lateral jaws are lined with filaments that the juveniles use to filter microscopic cuspipods out of the air. After a half Silvanus year they drop down to the forest floor and begin a life on their legs, by that time the dorso-ventral jaws have become larger and broader allowing the animals to graze on low vegetation. With 2 years the first layers of the antlers begin to form.