Acosmia Explained

Acosmia is an extinct genus of marine worm from the Cambrian aged Chengjiang biota of Yunnan, China. It is represented by a single rare species, Acosmia maotiania, that reached 45 mm in length and 9 mm in width.[1] It was likely a burrowing animal that fed by deposit feeding. While originally suggested to be a priapulid (penis worm), a 2020 study proposed to be a stem-group ecdysozoan, due to lacking the radial pharygneal armature that characterises modern ecdysozoans, including priapulids.[2]

Notes and References

  1. Book: The Cambrian Fossils of Chengjiang, China: The Flowering of Early Animal Life. 9780470999943. Hou. Xian-Guag. Aldridge. Richard. Bergstrom. Jan. Siveter. David J. Siveter. Derek. Feng. Xiang-Hong. 2008-04-15. John Wiley & Sons .
  2. Howard . Richard J. . Edgecombe . Gregory D. . Shi . Xiaomei . Hou . Xianguang . Ma . Xiaoya . 2020-11-23 . Ancestral morphology of Ecdysozoa constrained by an early Cambrian stem group ecdysozoan . BMC Evolutionary Biology . en . 20 . 1 . 156 . 10.1186/s12862-020-01720-6 . 1471-2148 . 7684930 . 33228518 . 2020BMCEE..20..156H . free .

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