Propodeum
The propodeum or propodium is the first abdominal segment in Apocrita Hymenoptera (wasps, bees and ants). It is fused with the thorax to form the mesosoma. It is a single large sclerite, not subdivided, and bears a pair of spiracles. It is strongly constricted posteriorly to form the articulation of the petiole, and gives apocritans their distinctive shape.
In molluscs
Propodium is the anterior (frontal) part of the foot of a mollusk.
gollark: There were also fewer of them working on problems like this than we have now, and they may have missed retrospectively-obvious things.
gollark: Tradition is *a* reason to think something might be better, but a fairly weak one, since the people of the past had rather different values, and not tools like computer simulations or more recent mathematical analyses of voting systems.
gollark: Also, yes, the context is quite different so reasons from then may not apply.
gollark: It's also possible that more complex systems may have been impractical before computers came along, although that doesn't apply to, say, approval voting.
gollark: First-past-the-post is the simplest and most obvious thing you're likely to imagine if you want people to "vote for things", and it's entirely possible people didn't look too hard.
References
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