Two cybeline trilobites from the Ordovician of Sweden
Titel:
Two cybeline trilobites from the Ordovician of Sweden
Auteur:
Owen, Alan W. Tripp, Ronald P.
Verschenen in:
GFF
Paginering:
Jaargang 110 (1988) nr. 3 pagina's 279-288
Jaar:
1988-09-15
Inhoud:
Cybele bellatula (Dalman), the type species of Cybele, is redescribed from the lower Kunda Stage (uppermost Arenig-lowest Llanvim) of Ostergotland 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 Vastergotland. 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.
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