Cannabaceae

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Promissum
Temporal range: Upper Ordovician [1]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: †Conodonta
Family: †Balognathidae
Genus: †Promissum
Kovacs-Endrody, 1986
Species:
†P. pulchrum
Binomial name
†Promissum pulchrum
Kovacs-Endrody, 1986

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.[2]

Well-preserved specimens were discovered in the Soom shale of South Africa in 1994.[3]

Promissum was probably capable of maintaining a cruising speed, but not of bursts of speed.[3]

References

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  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. Bibcode:1998JGSoc.155..447G. doi:10.1144/gsjgs.155.3.0447. S2CID 129236534.
  2. ^ Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 23. ISBN 1-84028-152-9.
  3. ^ a b 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. Bibcode:1995Natur.374..800G. doi:10.1038/374800a0. S2CID 4342260.
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source: Https://en.wikipedia.org/wiki/Promissum

One thought on “Cannabaceae”

  1. Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
    View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction

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