Invertebrate paleontology
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Invertebrate paleontology (also spelled invertebrate palaeontology) is sometimes described as invertebrate paleozoology or invertebrate paleobiology. Whether it is considered to be a subfield of geologic record .
By invertebrates are meant the non-vertebrate creatures of the Chordata .
Relatedly, invertebrates have never had a braincase (unlike many vertebrates).
Invertebrate terminology in scienceIn the many decades since paleontologists find it both useful and practical in evaluating fossil invertebrates and—consequently—invertebrate evolution.
However, there is one contemporary caveat: microbes either as invertebrates or as animals .
For example, the commonly Protoctista (and thus called protists or protoctists).
Thus modern invertebrate paleontologists deal largely with fossils of this more strictly defined Chordata), Phylum Chordata being the exclusive focus of vertebrate paleontology. Protist fossils are then the main focus of micropaleontology, while plant fossils are the chief focus paleobotany. Together these four represent the traditional taxonomic divisions of paleontologic study.
Origins and modern evolution
Invertebrate fossilizationWhen it comes to the fossil record, soft-bodied and minuscule invertebrates—such as paleontologists and other fossil hunters must often rely on trace fossils, microfossils, or chemofossil residue when scouting for these prehistoric creatures.
Hard-bodied and large invertebrates are much more commonly preserved; typically as sizeable silica (silicon dioxide), calcite or aragonite (both forms of calcium carbonate), chitin (a protein often infused with tricalcium phosphate), or keratin (an even-more complex protein), rather than the vertebrate bone (hydroxyapatite) or cartilage of fishes and land-dwelling tetrapods .
The mussels and oysters). On the other hand, shell-less slugs and non-tubiferous worms (for instance, earthworms ) lack hard parts and therefore such organisms are poorly represented in the fossil record.
Taxonomy of commonly fossilised invertebrates
FootnotesFurther readingAlthough these books are not footnoted in this article, the following are well-illustrated, well-organized—and often well-worn—guides to invertebrate (and sometimes other) fossils:
External links
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Major groups within phyla |
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- Phyla with ≥1000 extant species bolded
- Potentially dubious phyla†