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Temporal range: Upper Ordovician
Promissum NT small.jpg
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Conodonta
Family: Balognathidae
Genus: Promissum
Gabbott, Aldridge & Theron 1995[2]
Species: P. pulchrum
Binomial name
Promissum pulchrum

Promissum is an extinct genus of conodonts, primitive chordates, that lived during the Upper Ordovician period.

A conodont, Promissum had a primitive mouth under its eyes with mineralized teeth, which are both typical for conodonts. It had a primitive backbone and probably looked like a small eel or large worm, lacking any kind of fins except for perhaps a small one on the tail. It was relatively large for a conodont, reaching about 40 cm (16 inch) in length.[3]

Well-preserved specimens were discovered in the Soom shale of South Africa in 1994.[2]

Promissum was probably capable of maintaining a cruising speed, but not of bursts of speed.[2]


  1. ^ Gabbott, S.E.; Aldridge, R.J.; Theron, J.N. (1998). "Chitinozoan chains and cocoons from the Upper Ordovician Soom Shale lagerstatte, South Africa; implications for affinity". Journal of the Geological Society. 155 (3): 447–452. doi:10.1144/gsjgs.155.3.0447. 
  2. ^ a b c Gabbott, S.E.; R. J. Aldridge; J. N. Theron (1995). "A giant conodont with preserved muscle tissue from the Upper Ordovician of South Africa". Nature. 374 (6525): 800–803. doi:10.1038/374800a0. 
  3. ^ Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 23. ISBN 1-84028-152-9. 

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