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| Entelognathus primordialis Temporal range: Late Silurian
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| Holotype, Paleozoological Museum of China | |
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| Life reconstruction of Entelognathus primordialis | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | †Placodermi |
| Order: | †incertae sedis |
| Genus: | †Entelognathus Zhu et al., 2013 [1] |
| Species: | †E. primordialis
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| Binomial name | |
| †Entelognathus primordialis Zhu et al., 2013
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Entelognathus primordialis (“primordial complete jaw”) is an early placoderm from the late Silurian (Ludlow epoch) of Qujing, Yunnan, 419 million years ago.[2][1]
A team led by Min Zhu of the Academy of Sciences' Institute of Vertebrate Paleontology and Paleoanthropology in Beijing discovered the intact, articulated fossil in rock formations at Xiaoxiang reservoir.
- ^ a b Zhu, Min; Yu, Xiaobo; Ahlberg, Per Erik; Choo, Brian; Lu, Jing; Qiao, Tuo; Qu, Qingming; Zhao, Wenjin; Jia, Liantao; Blom, Henning; Zhu, You’an (2013). "A Silurian placoderm with osteichthyan-like marginal jaw bones]". Nature. 502 (7470): 188–193. Bibcode:2013Natur.502..188Z. doi:10.1038/nature12617. ISSN 0028-0836. PMID 24067611. S2CID 4462506.
- ^ Barford, Eliot (25 September 2013). "Ancient fish face shows roots of modern jaw". Nature. doi:10.1038/nature.2013.13823. S2CID 87470088. Retrieved 26 September 2013.