Two cybeline trilobites from the Ordovician of Sweden

Abstract

Cybele bellatula (Dalman), the type species of Cybele, is redescribed from the lower Kunda Stage (uppermost Arenig-lowest Llanvim) of Östergötland and a lectotype is chosen. Comparative material from Norway is also illustrated. A smooth triangular area on the anteromesial part of the glabella bears a deep pit and is probably a muscle insertion structure equivalent to the median pits or furrows in other cybelines, notably Cybeloides, Bevanopsis and Cybelurus. A new species, Atractopyge dalmani, is described on the basis of specimens from the Upper Jonstorp Formation (middle Harjuan-middle Ashgill) of Västergötland. These specimens were once thought to include the holotype of A. verrucosa, the type species of Atractopyge, to which A. dalmani was probably closely related.

Key Words:

• Trilobita
• Encrinuridae
• Cybelinae
• Cybele
• Atractopyge
• taxonomy
• Ordovician
• Östergötland
• Västergötland
• Sweden