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.
The most common scolecodont species were polychaetaspids, paulinitids, and mochtyellids.
65 1077 1038 1014 999 Acritarchs + + + + + + Chitinozoans + + + + + Graptolites + + Scolecodonts + Caldariola glabra glabra + Cymatiogalea deunffii + Cymatiogalea messaoudensis Cymatiogalea velifera + cf.
Frequency patterns of chitinozoans, scolecodonts, and conodonts in the upper Llandovery and lower Wenlock of the Paatsalu core, western Estonia.
Planktons are represented by marine calcareous nannofossils (Discoaster spp) (Figure 4a-c), dinoflagellate cysts (Schizosporis and Protoperidinium) (Figure 4i), and scolecodonts (polychaete mouth parts) (Figure 4k).
In addition, palynologic analysis reveals the presence of land spores, acritarchs, chitinozoans, and scolecodonts.
Palynodebris Characteristics Amorphous organic matter Unstructured, irregularly-shaped, light brown to medium brown masses; usually gel- like (Figure 2A) Marine palynomorphs Scolecodonts (chitinous mouth parts of marine annelid worms) and acritarchs (cysts of marine algal phytoplankton, Figure 2G) Black debris Opaque particles with sharp angular outlines; lath-shaped, sometimes more equidimensional (Figure 2E) Yellow-brown debris Structureless particles of yellow to light brown color; attributable to highly degraded herbaceous material (Figure 2A) Black-brown debris Unstructured dark brown to nearly black particles; attributable to highly degraded woody material Cuticles Platy epidermal fragments of leaves, roots, etc.
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.