Facivermis

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title: "Facivermis" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["cambrian-animals", "lobopodia", "cambrian-genus-extinctions"] description: "Extinct genus of panarthropods" topic_path: "general/cambrian-animals" source: "https://en.wikipedia.org/wiki/Facivermis" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Extinct genus of panarthropods ::

| taxon = Facivermis | fossil_range = Lower Cambrian | image = 玉溪市博物馆-寒武纪早期-云南澄江-云南火把虫复制品 Facivermis yunnanicus.jpg | image_caption = Fossil of Facivermis yunnanicus in Yuxi Museum | authority = Hou & Chen 1989 | subdivision_ranks = | subdivision = {{bold species list |F. yunnanicus| Hou & Chen, 1989 |F. longiusula| (Hu, 2002)}} ::figure[src="https://upload.wikimedia.org/wikipedia/commons/3/3f/20210901_Facivermis_yunnanicus_diagrammatic_reconstruction.png" caption="Diagrammatic Reconstruction of ''Facivermis yunnanicus ''"] ::

Facivermis (meaning "torch worm" ) is a genus of sessile lobopodian from the Lower Cambrian Maotianshan shales of China

Anatomy

Facivermis was a worm-like creature up to 90 mm long. Its body was divided into three sections. The anterior section had five equally sized pairs of appendages with two setal rows along the margins. The middle section was elongate and five times longer than the anterior or posterior. The posterior section was pear-shaped and had three rows of hooks surrounding the anus.

Classification

Facivermis was considered by its describers to be a polychaete worm. Since its discovery, however, most evidence has supported its being a lobopodian. In 2020, new specimens of the organism were found with a preserved tube, showing that it was a sessile tube worm-like lobopodian belonging to Luolishaniidae, with a bulbous posterior.

Ecology

::figure[src="https://upload.wikimedia.org/wikipedia/commons/8/88/Facivermis_2.png" caption="Ecological restoration of ''Facivermis'' extended and hidden inside their tubes."] ::

Facivermis was previously interpreted as a predator that anchored itself into sediment with its hooked posterior end and used its anterior appendages to catch prey. One fossil has a possible bradoriid preserved in its gut. However the new specimens described in 2020 suggest a suspension-feeding lifestyle similar to feather duster worms, with the posterior hooks used to anchor itself into their cylindrical tube.

References

References

1. Hou, X.. (1989). "Early Cambrian tentacled worm-like animals (''Facivermis'' gen. nov.) from Chengjiang, Yunnan". Acta Palaeontologica Sinica.
2. Liu, J.. (2006). "New observations of the lobopodian-like worm ''Facivermis'' from the Early Cambrian Chengjiang Lagerstätte". [[Chinese Science Bulletin]].
3. Delle Cave, L.. (1998). "Advances, diversions, possible relapses and additional problems in understanding the early evolution of the Articulata". Italian Journal of Zoology.
4. Huang D.. (2012). "The homonymy of ''Xishania'' with reference to ''Xishania fusiformis'' Hong, 1981 and ''X. longisula'' Hu, 2002". Acta Palaeontologica Sinica.
5. (February 2020). "A Tube-Dwelling Early Cambrian Lobopodian". Current Biology.

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::