New palaeoscolecids from the Cambrian of Scandinavia
2007 (English)In: Lundadagarna i historisk geologi och paleontologi X: 12-13 March 2007 Abstracts with programme, 2007, 44- p.Conference paper (Other scientific)
Palaeoscolecid sclerites were found in samples originating from three lower Middle Cambrian localities of southern Scandinavia: Brantevik, Scania [Forsemölla Limestone Bed (= 'fragment' limestone)]; Bornholm (Exulans Limestone Bed); and Öland (Granulata Conglomerate Bed). Four morphotypes are distinguished which are assigned to three new species, here informally named Hadimopanella sp. A, sp. B and sp. C. Hadimopanella sp. A includes two morphotypes typified by the end members of a continuous morphological series: both morphotypes have a central elevated platform, which is characterized by several larger knobs circumscribing the platform in the first, and by numerous small knobs covering the hole platform in the second morphotype. All specimens from Scandinavia which have been previously illustrated and informally named Hadimopanella sp. belong to this taxon. Hadimopanella sp. B resembles Hadimopanella sp. A, but does not show its wide variety and has a convex platform surface rather than a concave one. Hadimopanella sp. C bears a central spiny knob which is surrounded by six to 14 similar shaped and sized knobs. The central knob might be split into a cluster of up to six smaller pointy knobs. The study demonstrates vividly the importance of having a large number of sclerites to accurately assess the morphological range realized within the scleritome of a palaeoscolecid species that is known only in disarticulated form. Thus, without knowing the morphological range, individual sclerites of Hadimopanella sp. A could easily be mistaken for two species. Likewise, individual sclerites of Hadimopanella sp. C could be misidentified as Sahascolex labyrinthus Ivantsov & Wrona from the Lower Cambrian of Siberia. In addition to the disarticulated sclerites, two palaeoscolecid cuticle remains from the Lower Cambrian Skyberg Member (Ringstrand Formation) of Norway are presented. The remains show the typical body annulations of palaeoscolecids but the poor preservation of the individual sclerites does not allow a detailed systematic allocation.
Place, publisher, year, edition, pages
2007. 44- p.
Paleoscolecids, Cambrian, Hadimopanella, Scania, Bornholm, Mjösa, Öland
IdentifiersURN: urn:nbn:se:uu:diva-10302ISBN: 9789186746869OAI: oai:DiVA.org:uu-10302DiVA: diva2:38070