Arachnea parapluviosis crinoidea

  Arachnea parapluviosis crinoidea, also known as the lily spider of the seas, is one of the candidates from which the phylum Arachnea parapluviosis The lily spider of the seas is said to be a genetically modified hybrid, created by his doctorship von Leverkühn, combining an unspecified species of sea lily and Halomonas titanicae, a metal-consuming bacterium.  The noble intention behind this endeavour was to filter out polluting metal particles from the world’s oceans. However, the escape of a few specimens from their breeding tanks led to unintended but far-reaching consequences.
  With its tentacle-like arms Arachnea parapluviosis crinoidea filters metal particles from the water. Scattered across its arms and stem-like body—safely hidden in the lily spider’s pores—bacteria nest and wait for the metal particles to be delivered to them via cilia.  The bacteria extract energy from the particles and share it with the lily spider of the seas.  However, during the process, the bacteria gradually metallize the spider.  Eventually, this leads to complete petrification, resulting in the death of the lily spider of the seas, which can then be easily collected from the seabed and melted for its metal content.  
  This cruel fate may have prompted Arachnea parapluviosis crinoidea to escape its aquatic habitat.  Assuming they are intelligent creatures aware of their impending doom, they may have abandoned their sessile state and begun moving like feather stars.  The transition to land could have followed quickly, facilitated by the strengthening of their soft tentacles through metallization. 
  It is also intriguing to note that the tentacles of Arachnea parapluviosis crinoidea resemble the fecal structures Arachnea parapluviosis uses to communicate. How this analogy between excrement and manipulative limbs came about, why it exists, and what philosophical consequences it entails is a topic of lively debate.

Tentacle of an Arachnea parapluviosis crinoidea.
Tentacle of an Arachnea parapluviosis crinoidea.