Nessariostoma

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:	Animalia
Phylum:	Chordata
Class:	Placodermi
Order:	Pseudopetalichthyida Denison 1975
Family:	Paraplesiobatidae Berg 1940
Genus:	Nessariostoma
Species:	N. granulosum
Binomial name
Nessariostoma granulosum Broili, 1933