Darriwilian (Middle Ordovician) worms of southern Sweden

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Darriwilian (Middle Ordovician) worms of southern Sweden. / Eriksson, Mats E.; Lindskog, Anders; Servais, Thomas; Hints, Olle; Tonarová, Petra.

In: GFF, Vol. 138, No. 4, 01.10.2016, p. 502-509.

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Eriksson, Mats E. ; Lindskog, Anders ; Servais, Thomas ; Hints, Olle ; Tonarová, Petra. / Darriwilian (Middle Ordovician) worms of southern Sweden. In: GFF. 2016 ; Vol. 138, No. 4. pp. 502-509.

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TY - JOUR

T1 - Darriwilian (Middle Ordovician) worms of southern Sweden

AU - Eriksson, Mats E.

AU - Lindskog, Anders

AU - Servais, Thomas

AU - Hints, Olle

AU - Tonarová, Petra

PY - 2016/10/1

Y1 - 2016/10/1

N2 - The record of scolecodonts (polychaete jaws) from the Ordovician of Sweden is very poor. In this paper, we document a Darriwilian (Middle Ordovician) assemblage recovered from palynological samples from the “orthoceratite limestone” (Lanna and Holen limestones) of Mount Kinnekulle, Västergötland, southern Sweden. The collection of diminutive specimens forms an assemblage taxonomically composed mainly of simple placognath (mochtyellids, xanioprionids) and ctenognath (tetraprionids) taxa, whereas labidognaths (polychaetaspids) and taxa with other evolutionary grade-type apparatuses are very rare or absent. In addition, putative priapulid (penis worm) teeth were identified, possibly representing the first fossil representatives recorded in Sweden. The highest scolecodont abundance coincides with the lower to middle part of the “Täljsten” interval (lower Kunda Baltoscandian Stage). These strata are interpreted as having been formed during a marked regressional phase, suggesting that the palaeobathymetry and/or bottom substrate was optimal for polychaete colonization at that time. This new assemblage from Kinnekulle adds to the global scolecodont record in which data on Middle Ordovician and older specimens are still rudimentary but of importance for understanding early polychaete phylogeny.

AB - The record of scolecodonts (polychaete jaws) from the Ordovician of Sweden is very poor. In this paper, we document a Darriwilian (Middle Ordovician) assemblage recovered from palynological samples from the “orthoceratite limestone” (Lanna and Holen limestones) of Mount Kinnekulle, Västergötland, southern Sweden. The collection of diminutive specimens forms an assemblage taxonomically composed mainly of simple placognath (mochtyellids, xanioprionids) and ctenognath (tetraprionids) taxa, whereas labidognaths (polychaetaspids) and taxa with other evolutionary grade-type apparatuses are very rare or absent. In addition, putative priapulid (penis worm) teeth were identified, possibly representing the first fossil representatives recorded in Sweden. The highest scolecodont abundance coincides with the lower to middle part of the “Täljsten” interval (lower Kunda Baltoscandian Stage). These strata are interpreted as having been formed during a marked regressional phase, suggesting that the palaeobathymetry and/or bottom substrate was optimal for polychaete colonization at that time. This new assemblage from Kinnekulle adds to the global scolecodont record in which data on Middle Ordovician and older specimens are still rudimentary but of importance for understanding early polychaete phylogeny.

KW - Middle Ordovician

KW - orthoceratite limestone

KW - polychaetes

KW - priapulids

KW - scolecodonts

KW - Sweden

UR - http://www.scopus.com/inward/record.url?scp=84976254500&partnerID=8YFLogxK

U2 - 10.1080/11035897.2016.1181102

DO - 10.1080/11035897.2016.1181102

M3 - Article

VL - 138

SP - 502

EP - 509

JO - Geologiska Foreningens i Stockholm Forhandlingar

T2 - Geologiska Foreningens i Stockholm Forhandlingar

JF - Geologiska Foreningens i Stockholm Forhandlingar

SN - 2000-0863

IS - 4

ER -