Curious resemblance with the North American species Thyanta custator.
For photos reference, see page 6 in this document, https://commercialveg.ifas.ufl.edu/media/commercialvegifasufledu/images/resources/SB-guide-3.3.23.pdf, or a photo like this one, https://www.insectimages.org/browse/detail.cfm?imgnum=5577726.
BL: 2-3 mm
Found over Rumex vesicarius with few other specimens.