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]
| Nessariostoma Temporal range: Emsian
| |
|---|---|
| |
| Artist's reconstruction | |
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | |
| Order: | Denison 1975
|
| Family: | Paraplesiobatidae Berg 1940
|
| Genus: | Nessariostoma
|
| Species: | N. granulosum
|
| Binomial name | |
| Nessariostoma granulosum Broili, 1933
| |
References
edit- ^ 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
edit
 | This article about a placoderm is a stub. You can help Wikipedia by expanding it. |