Korarchaeota (archaea). The metabolic processes of this phylum of archaea are so far unclear.
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- Glycogen body. The function of this structure in the spinal cord of birds is not known.
- Arthropod head problem. A long-standing zoological dispute concerning the segmental composition of the heads of the various arthropod…
- Ovaries of basking sharks. Only the right ovary in female basking sharks appears to function. The reason is unknown.
- Brightly colored bird eggs. It is unknown what evolutionary process would lead birds to having brightly colored eggs given the increased…
- Stegosaur osteoderms/scutes. There is a long-standing debate over whether the primary function of the osteoderms/scutes of stegosaurs is…
- Function of vanadocytes, a type of blood cells found in some tunicates. Vacuoles of vanadocytes are notable for high levels of the metal…
- Metabolism in Henneguya zschokkei, a species of myxozoan. This species of cnidarian was found to lack mitochondria and, therefore, is…
- Mitochondria in loriciferans living in anoxic conditions. It is unknown whether members of the phylum Loricifera adapted to life in anoxic…