alternative definition added almost 15 years ago by Istvan Miko
One of the spine-bearing intersegmental sclerites of the thoracic venter, associated or united with the sternum preceding; a spinasternum may become a part of the definitive prosternum or mesosternum, but not of the metasternum.
Reference: Snodgrass, R. E. 1926. The morphology of insect sense organs and the sensory nervous system. Smithsonian Miscellaneous Collections 77:1-80.
Cross reference:
None provided.