elytrum, el′it-rum, n. the fore-wing of beetles, modified to form more or less hard coverings for the hind pair—also El′ytron:—pl.
I saw one once on one elytrum of a beetle and not on the other.
When a spot for instance is partly on one elytrum and partly on the other.
This robust structure seems to indicate that the scapular has to counteract a powerful action both of the leg and elytrum.
The elytrum, which is heavier and much less extensive, repeats this structure.
The suture is the internal margin of the elytrum from the point of the scutellum to the end.
In general it is either rectangular or rounded, with a prominence of the elytrum within it.