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針球接子屬（學名：Acadagnostus），又名古球接子屬，是生存於中寒武紀的一屬球接子目三葉蟲，生活在深海中。牠們是一類體型很小的無眼三葉蟲，僅有兩個胸節，捲曲得很緊。頭尾大小相當。頭鞍前面有條溝槽將該部分分為兩半。在尾甲中軸後面也有一條相似的溝槽。[1]
本属包括以下物种：
- †Acadagnostus acadicus (Hartt in Dawson, 1868)， 異名 Agnostus acadicus, Peronopsis tramitis, Pseudoperonopsis iniugata
- †Acadagnostus ancisa (Öpik, 1979) 異名 Pseudoperonopsis ancisa
- †Acadagnostus australis (Robison, 1978) 異名 Baltagnostus australis
- †Acadagnostus certus (Öpik, 1979) 異名 Euagnostus certus
- †Acadagnostus karatauensis (F. Ergaliev, 2008) 異名 Lisogoragnostus karatauensis
- †Acadagnostus rakuroensis Kobayashi, 1939 異名 Agnostus damesi, Agnostus liaotungensis, Peronopsis uzbekistanica
- †Acadagnostus syrma (Öpik, 1979)，異名 Pseudoperonopsis syrma[2]
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