Nessariostoma
Nessariostoma Temporal range: Emsian | |
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Artist's reconstruction | |
Scientific classification | |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Placodermi |
Order: | Pseudopetalichthyida Denison 1975 |
Family: | Paraplesiobatidae Berg 1940 |
Genus: | Nessariostoma |
Species: | N. granulosum |
Binomial name | |
Nessariostoma granulosum Broili, 1933 |
Nessariostoma granulosum is a lightly armored pseudopetalichthyid placoderm from the Hunsrückschiefer Lagerstätte of Early Devonian Germany. The type and only known specimen is an articulated, but very incomplete individual, deformed and elongated, consisting of a large, incomplete, tubercle-covered head, a long, beak-like rostrum, and some of the trunk, with a total length of 18 centimeters.[1] N. granulosum was once placed in Stensioellida, though most other experts regard it at as a pseudopetalichthyid: Denison 1978 regards it as a placoderm incertae sedis because the specimen is deformed and so poorly preserved so as to stymie proper attempts at classification.[1]
References
- ^ a b Denison, Robert (1978). Placodermi Volume 2 of Handbook of Paleoichthyology'. Stuttgart New York: Gustav Fischer Verlag. pp. 119–120. ISBN 978-0-89574-027-4.
External links
- Pseudopetalichthys at the Paleobiology Database
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Acanthothoraci* |
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Petalichthyida |
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Ptyctodontida |
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Rhenanida |
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Antiarchi |
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Arthrodira |
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Others |
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