Lyrarapax is a radiodont genus of the family Amplectobeluidae that lived in the early Cambrian period 520 million years ago. Its neural tissue indicates that the radiodont frontal appendage is protocerebral, resolving parts of the arthropod head problem and showing that the frontal appendage is homologous to the antennae of Onychophorans and labrum of euarthropods.[1] Its fossilized remains were found in Yunnan in southwestern China. A second species was described in 2016, differing principally in the morphology of its frontal appendages.[2] It is a small animal, with L. unguispinus and L. trilobus measuring up to 8.3 cm (3.3 in) and 3.9 cm (1.5 in) in body length respectively.[3]
| Lyrarapax Temporal range: Cambrian Period,
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| Comparison of the frontal appendages of the two species | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Order: | †Radiodonta |
| Clade: | †Amplectobeluidae |
| Genus: | †Lyrarapax Cong et al., 2014[1] |
| Type species | |
| Lyrarapax unguispinus Cong et al., 2014
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| Species | |
Etymology
editThe scientific name "Lyrarapax" is a compound word of the Latin "lyra" (lyre) and "rapax" (predator), and is named after the outline of the body of this genus, which resembles a stringed instrument called a lyre, as well as its presumed predatory lifestyle.[1]
See also
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References
edit- ^ a b c d Peiyun Cong; Xiaoya Ma; Xianguang Hou; Gregory D. Edgecombe; Nicholas J. Strausfeld (2014). "Brain structure resolves the segmental affinity of anomalocaridid appendages". Nature. 513 (7519): 538–42. Bibcode:2014Natur.513..538C. doi:10.1038/nature13486. PMID 25043032. S2CID 4451239.
- ^ a b Cong, Peiyun; Daley, Allison C.; Edgecombe, Gregory D.; Hou, Xianguang; Chen, Ailin (2016). "Morphology of the radiodontan Lyrarapax from the early Cambrian Chengjiang biota". Journal of Paleontology. 90 (4): 663–671. doi:10.1017/jpa.2016.67. S2CID 88742430.
- ^ Lerosey-Aubril R, Pates S (September 2018). "New suspension-feeding radiodont suggests evolution of microplanktivory in Cambrian macronekton". Nature Communications. 9 (1): 3774. Bibcode:2018NatCo...9.3774L. doi:10.1038/s41467-018-06229-7. PMC 6138677. PMID 30218075. Dryad Data
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