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Anybody knows which species (or genus, family...) of ant/wasp is that?

wasp

It's from Brazilian Amazon (Upper Negro River, Amazonas state). About 2-3 cm long (about one inch), maybe. It was walking on the sandy road around noon. Don't know the month of the year.

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  • $\begingroup$ I think this is a Cryptus wasp, and from the googling I've done it looks very like Cryptus leechi, but I don't know which parts of the world that's found in. $\endgroup$
    – Astrid_Redfern
    Commented Nov 3, 2020 at 7:56
  • $\begingroup$ It looks even more like Cryptus rufovinctus. OP, take a look at the Cryptus species on this webpage: v3.boldsystems.org/index.php/Taxbrowser_Taxonpage?taxid=213691 and see what you think. $\endgroup$
    – Astrid_Redfern
    Commented Nov 3, 2020 at 8:03
  • $\begingroup$ @Astrid_Redfern I'm not sure, but the waist on mine has two segments, and the abdomen seems more like an Aculeata. $\endgroup$
    – Rodrigo
    Commented Nov 3, 2020 at 11:30
  • $\begingroup$ @Astrid_Redfern The wing venation is different too. $\endgroup$
    – Rodrigo
    Commented Nov 3, 2020 at 13:47
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    $\begingroup$ Great photo! I see 12 or 13 segments total on the antennae, so not Ichneumonidae (includes cryptus) which have 16 or so. $\endgroup$
    – Polypipe Wrangler
    Commented Nov 4, 2020 at 4:47

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Given the presence of a petiole and postpetiole, this is most likely a winged ant (drone or queen), such as this similar one here: https://bugguide.net/node/view/57281

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