Calcager apertum

{{short description|Species of fly}}

{{Use New Zealand English|date=July 2024}}

{{Speciesbox

| image = Calcager apertum 13592058.jpg

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| display_parents = 3

| genus = Calcager

| species = apertum

| authority = Hutton, 1901{{cite journal |last1=Hutton |first1=Frederick Wollaston |title=Synopsis of the Diptera Brachycera of New Zealand. |journal=Transactions and Proceedings of the New Zealand Institute |date=1901 |volume=33 |pages=1–95 |url=https://www.biodiversitylibrary.org/page/3303747#page/29/mode/1up |accessdate=1 December 2019 |archive-date=2 March 2016 |archive-url=https://web.archive.org/web/20160302113331/http://www.biodiversitylibrary.org/page/3303747#page/29/mode/1up |url-status=live }}

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Calcager apertum is a species of fly in the family Tachinidae.{{cite web |last1=O’Hara |first1=James E. |last2=Henderson |first2=Shannon J. |first3=D. Monty |last3=Wood |title=Preliminary Checklist of the Tachinidae (Diptera) of the World |url=http://www.nadsdiptera.org/Tach/WorldTachs/Checklist/Tachchlist_ver2.1.pdf |website=Tachinidae Resources |access-date=5 February 2024 |date=5 March 2020 |archive-date=9 April 2023 |archive-url=https://web.archive.org/web/20230409192101/http://www.nadsdiptera.org/Tach/WorldTachs/Checklist/Tachchlist_ver2.1.pdf |url-status=live }}