Proper noun
- A taxonomic subclass within the class Trilobita — some of the trilobites.
librostoma
English Wiktionary. Available under CC-BY-SA license.
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"librostoma." YourDictionary, n.d. Web. 14 January 2019. <https://www.yourdictionary.com/librostoma>.
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librostoma. (n.d.). Retrieved January 14th, 2019, from https://www.yourdictionary.com/librostoma
