Cannabaceae

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Patrognathus
Temporal range: Tournaisian
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
†Conodonta
(unranked):
†Prioniodontida
Order:
†Ozarkodinida
Superfamily:
†Polygnathacea
Family:
†Cavusgnathidae
Genus:
†Patrognathus

Species
  • †Patrognathus andersoni
  • †Patrognathus crassus
  • †Patrognathus variabilis

Patrognathus is an extinct genus of conodonts.

Use in stratigraphy

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The Tournaisian, the oldest age of the Mississippian (also known as Lower Carboniferous) contains eight conodont biozones, four of which contain Patrognathus species:

  • the zone of Siphonodella quadruplicata and Patrognathus andersoni (upper zone of Patrognathus andersoni)
  • the lower zone of Patrognathus andersoni
  • the zone of Patrognathus variabilis
  • the zone of Patrognathus crassus

References

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  1. ^ British Avonian (Carboniferous) conodont faunas, and their value in local and intercontinental correlation. FHT Rhodes, RL Austin, EC Druce, 1969, British Museum (Natural History)
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source: Https://en.wikipedia.org/wiki/Patrognathus

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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