Scolecodont


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scolecodont

[skō′lē·kə‚dänt]
(paleontology)
Any of the paired, pincerlike jaws occurring as fossils of annelid worms.

Scolecodont

 

a fossil worm jaw belonging to predatory polychaetes. A scolecodont looks like a black serrated curved plate 0.3–3 mm in size and consists of organic matter and silica. Scolecodonts are generally found in Ordovician and Devonian deposits.

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The Rumba and lowermost Velise formations are characterized by a rather low chitinozoan/scolecodont ratio, ca 10 or less vesicles per scolecodont (but note how the scolecodonts were counted).
It is interesting to note that two benthic groups, brachiopods and polychaetes, show reversed diversity patterns: a low-diversity brachiopod fauna is associated with a high-diversity scolecodont assemblage, suggesting that the bottom environments were indeed more suitable for vagile benthos than sessile filtrators.
Other biotic components are rare but include calcareous sponge spicules, bryozoans, acritarchs, conodonts, scolecodonts, chitinozoans and various problematica (approximately listed in order of abundance).
Palynology is the science that studies contemporary and fossil palynomorphs, including pollen, spores, orbicules, dinoflagellate cysts, acritarchs, chitinozoans and scolecodonts, together with particulate organic matter (POM) found in sedimentary rocks and sediments (Jansonius and McGregor 1996).
Frequency patterns of chitinozoans, scolecodonts, and conodonts in the upper Llandovery and lower Wenlock of the Paatsalu core, western Estonia.
In addition, palynologic analysis reveals the presence of land spores, acritarchs, chitinozoans, and scolecodonts. Initial paleoecological and sedimentological evidence suggest a nonturbulent, low energy, marine, mud flat environment.
Occurrences of palynomorph groups and selected acritarch species in the Fezouata formations of borehole AZ-1 Depth (m) 1129.5 1100.65 1077 1038 1014 999 Acritarchs + + + + + + Chitinozoans + + + + + Graptolites + + Scolecodonts + Caldariola glabra glabra + Cymatiogalea deunffii + Cymatiogalea messaoudensis Cymatiogalea velifera + cf.
The majority of extracted palynomorphs throughout the section are represented mainly by pylomate sphaeromorphic and simple acanthomorphic acritarchs associated with cryptospores and fragmented chitinozoans and scolecodonts. Long-ranging Baltisphaeridium, Goniosphaeridium, Micrhystridium and Solisphaeridium are common in most samples.
Frequency patterns of chitinozoans, scolecodonts and conodonts in the upper Llandovery and lower Wenlock of the Paatsalu core, western Estonia.