lingulate brachiopod from Chengjiang

[2Ronalds]

This is a picture of what I think must be a lingulate brachiopod. It was hidden on a plate with several Palaeolenus trilobites from Chengjiang that I bought on ebay. I compared it to Diandongia pista, Heliomedusa orienta, Lingulella chengjiangensis and Longtancunella chengjiangensis but it looks quite different. Does anyone has a clue?