Propodeum

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File:Scheme ant worker anatomy-en.svg
Propodeum labelled within the alitrunk of an ant worker

The propodeum[a] is a term that can refer to unrelated structures in insects or in mollusks.

Insects

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The first abdominal segment in Apocrita Hymenoptera (wasps, bees and ants) is known as the propodeum. 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. There may be a suture between the propodeum and the thorax, like in Symphyta[3] or not, and the presence or absence of such suture can aid in identifying specimens.

Mollusks

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File:Hypothetical Ancestral Mollusc by Huxley.jpg
Thomas Henry Huxley's diagram of a hypothetical stem mollusk labels the propodeum shown at lower left as 'p.p.'

Propodeum is the anterior (frontal) part of the foot of a mollusk.[4]

Notes

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  1. ^ zooanatomical jargon derived from Ancient Greek: πρωπόδιον "forefoot", also as 'propodeon'[1][2] or 'propodium'[attribution needed]; plurals 'propodea', 'propodia', or by appending -s to the singular

References

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