Protohertzina is a genus of conodonts (protoconodonts or paraconodonts) or, possibly, Chaetognaths, found at the beginning of the Cambrian explosion.
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| Genus: | †Protohertzina Missarzhevsky, 1973[1]
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Protoconodonts are an extinct taxonomic group of conodonts.[2] Chaetognaths (also known as arrow worms) were thought possibly to be related to some of the animals grouped with the conodonts. The conodonts themselves, however, are thought to be early vertebrates. It is now thought that protoconodont elements (e.g., Protohertzina anabarica Missarzhevsky, 1973), are probably grasping spines of chaetognaths rather than teeth of conodonts.
Protohertzina fossils have been found in the Ingta Formation of Canada.
Use in stratigraphy
editThe earliest known fossils of the late Precambrian and early Cambrian come from the small shelly fossil assemblage of the Anabarites trisulcatus Zone of the Lower Nemakit-Daldynian Stage, Siberia. They are analogous to China's Anabarites trisulcatus-Protohertzina anabarica Zone of the basal Meishucunian Stage.
References
edit- ^ Conodont-shaped organisms from Precambrian-Cambrian boundary strata of the Siberian Platform and Kazakhstan. VV Missarzhevsky - Trudy Instituta Geologii i Geofiziki SO AN SSSR, 1973
- ^ Zooproblematica and mollusca from the Lower Cambrian Meishucun section (Yunnan, China) and taxonomy and systematics of the Cambrian small shelly fossils of China. P. Y. Parkhaev and Y. Demidenko, Paleontological Journal, 2010, volume 44, issue 8, pages 883-1161, doi:10.1134/s0031030110080010
External links
edit
- "Protohertzina". The Encyclopedia of Life.
- "Protohertzina". The Encyclopedia of Life.
- "Protohertzina". Paleobiology Database. Retrieved 27 July 2016.
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