Promissum

Promissum

taxobox
name= "Promissum"
fossil_range = Ordovician to Devoniancite journal
author = Gabbott, S.E.
coauthors = Aldridge, R.J.; Theron, J.N.
year = 1998
title = Chitinozoan chains and cocoons from the Upper Ordovician Soom Shale lagerstatte, South Africa; implications for affinity
journal = Journal of the Geological Society
volume = 155
issue = 3
pages = 447–452
doi = 10.1144/gsjgs.155.3.0447]
regnum = Animalia
phylum = Chordata
classis = Conodonta
ordo = Priodontina
genus = "Promissum"
genus_authority=Gabbot, Aldridge & Theron 1995

"Promissum" is an extinct genus of primitive chordate that lived in the Ordovician period, about 500 million years ago.

A conodont, "Promissum" had a primitive mouth under its eyes with mineralized teeth (typical for conodonts), and also a primitive backbone. It probably looked like a small eel or large worm, lacking any kind of fins except for perhaps a small one on the tail. Well-preserved specimens were discovered in the Soom shale of South Africa in 1994. cite journal|title=A giant conodont with preserved muscle tissue from the Upper Ordovician of South Africa|journal=Nature|date=1995|first=S.E.|last=Gabbott|coauthors=R. J. Aldridge, J. N. Theron|volume=374|issue=|pages=800–803|doi=10.1038/374800a0]

"Prosimmum" was probably capable of maintaining a cruising speed, but not of bursts of speed.

References


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