Class Placodermi Phylum Chordata | Subphylum Vertebrata Species N. granulosum Rank Genus | |
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Family ParaplesiobatidaeBerg 1940 Similar Paraplesiobatis, Pseudopetalichthys, Pseudopetalichthyida, Neopetalichthys, Arenipiscis |
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. 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.
References
Nessariostoma Wikipedia(Text) CC BY-SA