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THE OLDEST HORSESHOE CRAB: A NEW XIPHOSURID FROM LATE ORDOVICIAN KONSERVAT‐LAGERSTÄTTEN DEPOSITS, MANITOBA, CANADA
Abstract: A remarkable new fossil horseshoe crab, Lunataspis aurora gen. et sp. nov., from recently discovered Upper Ordovician (c. 445 Ma) shallow marine Konservat‐Lagerstätten deposits in Manitoba…
A soft-bodied mollusc with radula from the Middle Cambrian Burgess Shale
Odontogriphus omalus is interpreted to be members of an early stem-group mollusc lineage that probably originated in the Neoproterozoic Ediacaran Period, providing support for the retention of a biomat-based grazing community from the late Precambrian Period until at least the Middle Cambrian.
A holomorph approach to xiphosuran evolution—a case study on the ontogeny of Euproops
A holomorph approach is proposed, i.e., reconstructing ontogenetic sequences for fossil and extant species as a sound basis for a taxonomic, phylogenetic, and evolutionary discussion of Xiphosura.
Exceptionally preserved Late Ordovician biotas from Manitoba, Canada
- G. Young, D. Rudkin, E. Dobrzanski, S. Robson, G. Nowlan
- Environmental Science, Geography
- 1 October 2007
There are few body fossil biotas known from early Paleozoic accretionary shorelines, and very few examples of Ordovician soft-bodied assemblages. This study documents two recently discovered biotas…
A new mid-Silurian aquatic scorpion—one step closer to land?
It is postulate that these animals were aquatic, but occasionally ventured into extremely shallow water, or onto a transient subaerially exposed surface while moulting, before returning to deeper water.
Horseshoe Crabs – An Ancient Ancestry Revealed
The fossil record of the basic xiphosurid horseshoe crab body plan has been extended back to the Late Ordovician Period, about 445 million years ago, demonstrating an origin that lies outside of the…
Oldest Near-Complete Acanthodian: The First Vertebrate from the Silurian Bertie Formation Konservat-Lagerstätte, Ontario
The combination of features found in Nerepisacanthus supports the hypothesis that acanthodians could be a group, or even a clade, on the chondrichthyan stem.
Great Canadian Lagerstätten 3. Late Ordovician Konservat-Lagerstätten in Manitoba
Konservat-Lagerstatten , deposits in which soft-bodied or lightly sclerotized fossils are preserved, are very rare in Ordovician strata. Three significant sites are known from Upper Ordovician rocks…
A NEW LATE SILURIAN (PRIDOLIAN) NARAOIID (EUARTHROPODA: NEKTASPIDA) FROM THE BERTIE FORMATION OF SOUTHERN ONTARIO, CANADA—DELAYED FALLOUT FROM THE CAMBRIAN EXPLOSION
- Jean‐Bernard Caron, D. Rudkin, S. Milliken
- Geography, Environmental ScienceJournal of Paleontology
- 1 November 2004
Abstract The discovery of a new naraoiid nektaspid in the Upper Silurian (Pridolian) of southeastern Ontario significantly extends the range of this unusual group. Nektaspids are nonmineralized…