Chitinozoan
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Chitinozoa are a group of flask-shaped, organic walled marine microfossils produced by an as yet unknown organism. Common from the Ordovician to Devonian periods, the millimetre-scale organisms are ab
Whole chitinozoan cropped
Chitinozoa may have been immature graptolites.
Chitinozoa might represent gastropod egg sacs.
Silurian fossil coral from Gotland
Promissum
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Promissum is an extinct genus of conodonts, primitive chordates, that lived during the Upper Ordovician period.
Chitinozoan
…and graptolites are notable in their absence. Most organisms present in the shale can be ruled out for a variety of reasons, but polychaete worms, Promissum conodonts and orthocone cephalopods remain as likely candidates. However, further evidence connecting chitinozoans to any of these groups is circumstantial…
Promissum NT small