The Mesonacinae comprise an extinct
subfamily
In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus. Standard nomenclature rules end botanical subfamily names with "-oideae", and zo ...
of
trilobite
Trilobites (; meaning "three-lobed entities") are extinction, extinct marine arthropods that form the class (biology), class Trilobita. One of the earliest groups of arthropods to appear in the fossil record, trilobites were among the most succ ...
s that lived during the
Botomian
Cambrian Stage 4 is the still unnamed fourth stage of the Cambrian and the upper stage of Cambrian Series 2. It follows Cambrian Stage 3 and lies below the Wuliuan. The lower boundary has not been formally defined by the International Commission ...
, found in North-America, Greenland and North-Western Scotland. The two genera in this subfamily are ''
Mesonacis'' and ''
Mesolenellus''.
References
External links
''Photo of M. vermontanus''''Trilobite info''
Olenellidae
Cambrian trilobites
Cambrian Series 2 first appearances
Cambrian Series 2 extinctions
Trilobite subfamilies
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