A blind trilobite with Baltic affinities from Cambrian Series 3 of the Iberian Chains, Spain, and its stratigraphical and palaeobiogeographical significance

Abstract

Three cranidia of a conocoryphid trilobite are described from the lower Caesaraugustan Regional Stage (upper part of provisional Cambrian Stage 5 within Cambrian Series 3) in the Iberian Chains, Spain. The material is from the upper part of the Mansilla Formation and the base of the overlying Murero Formation. It closely resembles Bailiella tenuicincta (Linnarsson, 1879), which has previously been described from the Ptychagnostus gibbus (Cambrian Stage 5) and lower P. atavus zones (lower Drumian Stage) of Baltica (Sweden and Bornholm), and from the P. atavus Zone of West Avalonia (Newfoundland). The record of B. cf. tenuicincta from the Mediterranean margin of West Gondwana provides additional evidence for considering the Acado-Baltic region a discrete biogeographical province, at least during the Cambrian 5 and Drumian ages.

Systematic and biostratigraphy of the genera Parasolenopleura, Badulesia, and Pardailhania in the Iberian Chains: a useful zonation for the Miaolingian Series (former middle Cambrian) in the Mediterranean region

“…Synonymy. Badulesia tenera level (Sdzuy, , 1971, Badulesia tenera biozone (Liñán & Gozalo, 1986;, Badulesia tenera Zone (Liñán et al, 2002(Liñán et al, , 2004(Liñán et al, , 2008Gozalo et al, 2008Gozalo et al, , 2011bChirivella-Martorell et al, 2015, 2017. Not the Parasolenopleura tenera Zone (Fletcher, 2006), that would be equivalent to the lower part of Badulesia tenera interval Zone.…”