juxta

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File:Antispila oinophylla - Phallus and juxta.png]]

{{Wiktionary|juxta}}

In insect anatomy, the juxta is an organ in the males of most Lepidoptera (i.e. moths and butterflies) that supports the aedeagus, the organ used for reproduction in insects. The juxta is located between the two valvae.Eyer, J. R. (1926). "The morphological significance of the juxta in the male genitalia of Lepidoptera". Bull. Brook. Ent. Soc, 21, 32–37.

Juxta has also been used to refer to a similar structure in fleshflies.{{cite journal |last1=Buenaventura |first1=Ellana |last2=Szpila |first2=Krzysztof |last3=Cassel |first3=Brian |last4=Wiegmann |first4=Brian |last5=Pape |first5=Thomas |title=Anchored hybrid enrichment challenges the traditional classification of flesh flies (Diptera: Sarcophagidae) |journal=Systematic Entomology |date=October 2019 |volume=45 |issue=2 |pages=281–301 |doi=10.1111/syen.12395 |s2cid=209586901 |doi-access=free }}{{cite journal |last1=Buenaventura |first1=Ellana |last2=Pape |first2=Thomas |title=Phylogeny of the Peckia-genus group: evolution of male genitalia in the major necrophagous guild of Neotropical flesh flies (Diptera: Sarcophagidae) |journal=Organisms Diversity & Evolution |date=January 2015 |volume=15 |issue=2 |pages=301–331 |doi=10.1007/s13127-015-0203-0 |s2cid=16036600 |url=https://link.springer.com/article/10.1007/s13127-015-0203-0 |access-date=10 November 2020|url-access=subscription }}

The term comes from the Latin iuxta, meaning alongside. The biological use of the term should not be confused with the more general use of juxta- as a prefix.