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Isoxys (Arthropoda) with preserved soft anatomy from the Sirius Passet Lagerstätte, lower Cambrian of North Greenland
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
Dept of Geology, University of Leicester, U.K..
Dept of Geology, University of Leicester, U.K..
2010 (English)In: Lethaia: an international journal of palaeontology and stratigraphy, ISSN 0024-1164, E-ISSN 1502-3931, Vol. 43, no 2, 258-265 p.Article in journal (Refereed) Published
Abstract [en]

Isoxys volucris is the most commonly occurring species in the lower Cambrian Sirius Passet Lagerstatte of North Greenland. Newly identified material allows a first, limited, account of the ventral morphology of this species, hitherto known only by the morphology of its shield. The antennula is large and robust, composed of about seven articles armed with spines, and was probably not sensorial. The postantennular limbs are serially similar, biramous with a large paddle-shaped exopod fringed with setae. It is possible that the animal possessed a furca. The inner lamella, lining the ventral surface of the shield is recognised in Isoxys for the first time. Comparisons with other congeneric species of which aspects of the ventral morphology are known, show similarities with Isoxys auritus from China, reconsidered here, but indicate differences in antennular morphology with other species as currently understood. square Cambrian, Greenland, Isoxys, soft anatomy, Sirius Passet, palaeoecology.

Place, publisher, year, edition, pages
2010. Vol. 43, no 2, 258-265 p.
Keyword [en]
Cambrian, Greenland, Isoxys, soft, anatomy, Sirius Passet, palaeoecology
National Category
Geology
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
URN: urn:nbn:se:uu:diva-97597DOI: 10.1111/j.1502-3931.2009.00189.xISI: 000277328700012OAI: oai:DiVA.org:uu-97597DiVA: diva2:172602
Available from: 2008-09-29 Created: 2008-09-29 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Evolution and taxonomy of Cambrian arthropods from Greenland and Sweden
Open this publication in new window or tab >>Evolution and taxonomy of Cambrian arthropods from Greenland and Sweden
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Arthropods have a rich fossil record spanning the Phanerozoic. Biomineralized forms such as the extinct trilobites are particularly common and are proven index fossils for biostratigraphy. Forms with an unmineralized cuticle are more rare, preserved only in so called konservat lagerstätten. Cambrian strata of Greenland have yielded rich trilobite faunas with potential for intercontinental correlation of Cambrian strata, but also an exceptionally preserved fauna, the Sirius Passet Lagerstätte. The first part of this thesis is concerned with trilobite biotratigraphy of the provisional Cambrian Series 2 in Greenland. The second part is concerned with exceptionally preserved arthropods from the Sirius Passet Lagerstätte, but also from 'Orsten' deposits from the Cambrian of Sweden.

Perissopyge phenax occurs in the Henson Gletscher and Paralleldal formations spanning the Series 2 and 3 boundary interval in North Greenland. It also occurs in the Sekwi Formation of Yukon Territory, demonstrating that the species may hold potential for correlation within Laurentia. An indeterminate species of Perissopyge is shown to occur in the Ella Island Formation of North-East Greenland together with Olenellus cf. hanseni, which is similar to Olenellus cf. truemani described from the Henson Gletscher Formation. If this correlation is further corroborated it would offer a first tie-point for the An t'Sron Formation of North-West Scotland which yields Fritzolenellus lapworthi, herein reported for the first time from the Bastion Formation which underlies the Ella Island Formation.

Oelandocaris oelandica from ‘Orsten’ deposits in the Cambrian series 3 and 4 boundary interval in Sweden is an early representative of the Crustacean stem lineage. Kiisortoqia avannaarsuensis is a new arthropod from the Sirius Passet Lagerstätte with robust antennulae strikingly similar to the 'raptorial' limb of the problematic anomalocaridids. The ventral morphology of the 'bivalved' Isoxys volucris is described for the first time and compared with other species assigned to Isoxys from Cambrian lagerstätten around the world. Finally, Siriocaris trolla, is a new arthropod that similarities with trilobites and certain ‘trilobitomorphs’ but seems to lack important synapomorphies of these taxa, though this may be due to preservational limitations in the material at hand.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2008. 35 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 558
Keyword
Cambrian, Arthropods, Trilobites, Evolution, Greenland, Sweden
National Category
Geology
Identifiers
urn:nbn:se:uu:diva-9301 (URN)978-91-554-7302-0 (ISBN)
Public defence
2008-10-31, the lecture theatre, Museum of Evolution (Palaeontology), Norbyvägen 22, 75236 Uppsala, 10:00
Opponent
Supervisors
Available from: 2008-09-29 Created: 2008-09-29 Last updated: 2011-01-12Bibliographically approved

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