Desmograptus. micronematodes, a silurian dendroid graptolite, and its ultrastructure
Palaeontology
By: K.M. Saunders, D.E.B. Bates, Joanne Kluessendorf, David K. Loydell, and Donald G. Mikulic
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Abstract
Desmograptus micronematodes from Thornton quarry, Cook County, Illinois, USA, remarkably preserved in relief and encased in pyrite, is described. The internal details of the thecae, and of the stolon system, examined using the SEM, allow the reconstruction of the growth of a stipe. The stolons and stolonal nodes are formed of a dense crassal fabric, and are surrounded by a loose fabric of three-dimensional fibrils. The nodes have a complex structure of three boxes with proximal and distal nozzles. The base of a bitheca, and the base of each autothecal cup, has a central nozzle surrounded by a unique honeycomb fabric. The ultrastructure of the cortical fibrils, with their clockwise striations, is similar to that in Dendrograptus, and may be universal in the graptolites. The nodes of the stolon system appear identical to those of Acanthograptus and other dendroids, but differ from those of the extant hemichordate Rhabdopleura, which have only a diaphragm, and lack box structures. ?? The Palaeontological Association, 2009.
Suggested Citation
Saunders, K., Bates, D., Kluessendorf, J., Loydell, D.K., Mikulic, D.G., 2009, Desmograptus. micronematodes, a silurian dendroid graptolite, and its ultrastructure: Palaeontology, v. 52, no. 3, p. 541-559, https://doi.org/10.1111/j.1475-4983.2009.00859.x.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Desmograptus. micronematodes, a silurian dendroid graptolite, and its ultrastructure |
| Series title | Palaeontology |
| DOI | 10.1111/j.1475-4983.2009.00859.x |
| Volume | 52 |
| Issue | 3 |
| Publication Date | May 15, 2009 |
| Year Published | 2009 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Palaeontology |
| First page | 541 |
| Last page | 559 |