Nessariostoma
Nessariostoma Temporal range: Emsian | |
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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 |
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]
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