different between silurian vs acanthodian

Romanian

From French silurien

silurian n (plural silurieni)

Acanthodii +? -ian

acanthodian (plural acanthodians)

(zoology) A member of a group of extinct fish (Acanthodii) that existed from the Silurian to the Permian period.[First attested in the mid 19th century.]
- 2009 January 15, Martin D. Brazeau, “The braincase and jaws of a Devonian 'acanthodian' and modern gnathostome origins”, Nature Volume 457 No. 7227, doi:10.1038/nature07436:
  The emerging picture of acanthodian (and perhaps placoderm) paraphyly does not overturn a general consensus about gnathostome interrelationships.

acanthodian (not comparable)

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