Article: A revision of Acastella spinosa (Salter 1864) with notes on related trilobites
Acastella spinosa (Salter 1864) and Acastella? minor (M'Coy 1851) are redescribed and figured. The synonymy of A. spinosa and A. macrocentrus (Reed 1925) is established. A. spinosa is closely compared to other species attributed to the genus. A. prima Tomczykowa 1962 is recorded for the first time from the late Silurian of the British Isles.