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Cathaymyrus

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Extinct genus of chordates

Cathaymyrus Temporal range:Cambrian Stage 3,518 Ma^[1] PreꞒ Ꞓ O S D C P T J K Pg N ↓

C. diadexus (top) andVetulocystis (bottom)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Genus:	†Cathaymyrus Shu, Conway Morris & Zhang 1996^[2]
Type species
Cathaymyrus diadexus Shu, Conway Morris & Zhang 1996
Species
†C. diadexusShu, Conway Morris & Zhang 1996 †C. haikoensisLuo, Hu & Chen 2001^[3]

Cathaymyrus is a genus of EarlyCambrian chordate known from theChengjiang biota in Yunnan Province, China.^[4] Both species have a long segmented body with no distinctive head. The segments resemble v-shaped muscle blocks found incephalochordates such asAmphioxus. A long linear impression runs along the "back" of the body looking something like a chordatenotochord.^{[citation needed]}

While some authors have suggested that the genus is a cephalochordate and closely related to living lancelets, other authors have disputed this due to the poor preservation of the head region, considering its placement within Chordata uncertain.^[5]

References

[edit]

^Yang, C.; Li, X.-H.; Zhu, M.; Condon, D. J.; Chen, J. (2018)."Geochronological constraint on the Cambrian Chengjiang biota, South China"(PDF).Journal of the Geological Society.175 (4):659–666.Bibcode:2018JGSoc.175..659Y.doi:10.1144/jgs2017-103.ISSN 0016-7649.S2CID 135091168.
^Shu, DG., Morris, S. & Zhang, XL.A Pikaia-like chordate from the Lower Cambrian of China. Nature384, 157–158 (1996).https://doi.org/10.1038/384157a0
^Luo Huilin, Hu Shixue, Chen Liangzhong. (2001).New Early Cambrian Chordates from Haikou, Kunming.Acta Geologica Sinica, 75 (4)
^Shu, D-G.; Luo, H-L.; Conway Morris, S.; Zhang, X-L.; Hu, S-X.; Chen, L.; Han, J.; Zhu, M.; Li, Y.; Chen, L-Z. (1999). "Lower Cambrian vertebrates from south China".Nature.402 (6757): 42.Bibcode:1999Natur.402...42S.doi:10.1038/46965.S2CID 4402854.
^Nanglu, Karma; Cole, Selina R.; Wright, David F.; Souto, Camilla (February 2023)."Worms and gills, plates and spines: the evolutionary origins and incredible disparity of deuterostomes revealed by fossils, genes, and development".Biological Reviews.98 (1):316–351.doi:10.1111/brv.12908.ISSN 1464-7931.

Evolution of fish

Forerunners

Basal member
- †Pikaia
Cephalochordate
- †Cathaymyrus
- Lancelet
Olfactores
- †Haikouella
- Tunicate
- †Myllokunmingiidae? (†Haikouichthys,†Myllokunmingia)
- †Zhongxiniscus?

Jawless fish

Cyclostomata	Hagfish Hyperoartia Lamprey
†Conodonts	†Protoconodonta? †Paraconodontida †Conodonta
†Ostracoderms	†Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida †Pituriaspida †Osteostraci

Elasmobranchii
- †Ctenacanthiformes
- †Hybodontiformes
- †Phoebodontiformes
- †Xenacanthida
- Ray
- Shark

Holocephali
- †Eugeneodontida
- †Iniopterygiformes
- †Petalodontiformes
- †Symmoriiformes
- Chimaera

Bony

Lobe-finned	†Onychodontiformes Coelacanth Rhipidistia †Porolepiformes Lungfish Tetrapodomorpha
Ray-finned	†"Palaeonisciformes" Cladistia Polypteriformes Chondrostei Acipenseriformes Neopterygii †Pycnodontiformes Halecomorphi Ginglymodi Teleost

Lists

† extinct

Taxon identifiers
Cathaymyrus	Wikidata:Q19890829 GBIF:4823968 IRMNG:1204395

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References