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Oenonites
Figure 2 —Type Cincinnatian stratigraphy, graptolite, and conodont biostra...
Scanning electron microscope photos of selected scolecodonts. Scale bars 0....
LATE ORDOVICIAN JAWED POLYCHAETE FAUNAS OF THE TYPE CINCINNATIAN REGION, U.S.A
Vagrant benthos (Annelida; Polychaeta) associated with Upper Ordovician carbonate mud-mounds of subsurface Gotland, Sweden
Late Ordovician jaw-bearing polychaetes from Anticosti Island, eastern Canada, and their biogeographic significance
Polychaete palaeoecology in an early Late Ordovician marine astrobleme of Sweden
SCOLECODONTS: I. DESCRIPTIVE TERMINOLOGY AND REVISION OF SYSTEMATIC NOMENCLATURE; II. LECTOTYPES, NEW NAMES FOR HOMONYMS, INDEX OF SPECIES
Discovery of Devonian scolecodonts from the subsurface Western Desert, Egypt
Jaw-bearing polychaetes of the Silurian Eramosa Lagerstätte, Ontario, Canada
Scolecodont systematics exemplified by the polychaete Hadoprion cervicornis (Hinde, 1879)
JAWED POLYCHAETES FROM THE UPPER SYLVAN SHALE (UPPER ORDOVICIAN), OKLAHOMA, USA
Figure 5 —Selected SEM micrographs of representative and characteristic sc...
Review of Scolecodonts Assigned to Arabellites , Based on Hinde's (1879) Type Material
Ordovician Fossils From Upper Part of Type Section of Deadwood Formation, South Dakota
A Late Ordovician age for the Whirlpool and Power Glen formations, New York
Light microscope photographs of scolecodonts and jaw apparatuses preserved ...
Figure 7 —SEM micrographs of selected scolecodonts from the Sylvan Shale. ...
STRATIGRAPHIC ORIGIN OF ORDOVICIAN SCOLECODONTS INFERRED FROM ASSOCIATED GRAPTOLITES
Abstract Eunicidan polychaetes formed a significant part of Early Palaeozoic marine invertebrate communities, as shown by the abundance and diversity of scolecodonts (polychaete jaws) in the fossil record. In this study we summarize the early radiation and biodiversity trends and discuss the palaeobiogeography of these fossils. The oldest (latest Cambrian–Early Ordovician) representatives had primitive, usually symmetrical, placognath/ctenognath type jaw apparatuses. The first more advanced taxa, possessing labidognath-type jaw apparatuses or placognath apparatuses with compound maxillae, are first recorded in the Middle Ordovician. The most significant increase in generic diversity occurred in the Darriwilian, when many common taxa appeared and diversified. The Ordovician and Silurian scolecodont occurrences allow some palaeobiogeographical units and distribution patterns to be explored and outlined. The most robust data presently at hand derive from successions in Baltica and Laurentia. That information, together with new records from other palaeocontinents, reveals a wide distribution for the most frequent and species-rich genera and families, similar to the biogeographical patterns of extant polychaetes. Like many other benthic and pelagic fossil groups, scolecodont-bearing polychaetes show an increased cosmopolitan character in the Silurian as compared with the Ordovician. Species-level endemism appears to be relatively common, inferring a potential for scolecodonts as biogeographical tools in the future.