Nessariostoma
| Nessariostoma Temporal range: Emsian | |
|---|---|
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| Artist's reconstruction | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Subphylum: | Vertebrata |
| 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]
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