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mesonotum

Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
No Taxon (Glossary)
No Taxon (M)
No Taxon mesonotum
Explanation of Names
From Greek meso middle, and notum, from notos, the back.
Identification
mesonotum noun - the upper surface of the mesothorax, the middle segment of the thorax.
See Also
Divisions of thorax (front | middle | rear):

Dorsal surface of thorax (notum):
pronotum | mesonotum (scutellum) | metanotum

Lateral (pleural) surface of thorax:

Ventral surface of thorax:
Internet References
Hymatol.org Hymenoptera glossary.