Knowra Ostracod Ostracod An ostracod is a small crustacean enclosed in a hinged, two-part shell. Ostracods inhabit marine and freshwater environments, and their fossilized shells are widely preserved in sediments.
Carapace : A protective external covering that encloses or shields an animal’s body. An ostracod’s carapace consists of two hinged valves that enclose most of its body.
Ostracod locomotion : Movement by ostracods using limbs that extend from between their shell valves. Ostracods can swim or crawl by extending appendages while keeping much of the body protected.
Ostracod biostratigraphy : The use of ostracod fossils to correlate and relatively date sedimentary rock layers. Distinct ostracod assemblages help correlate strata, especially in some marine and nonmarine basins.
Myodocopida : An order of ostracods that includes species with well-developed eyes and varied swimming abilities. Its members show how some ostracods differ from the more sedentary, heavily calcified forms common in sediments.
Ostracod taphonomy : The study of how ostracod remains are preserved, altered, and assembled in sediments. Transport, breakage, and dissolution can make a fossil assemblage differ from the living community.
Crustacean : An arthropod in the group Crustacea, typically bearing a hard exoskeleton and jointed limbs. Ostracods are crustaceans, despite their compact, shell-enclosed appearance.
Ostracod feeding : The ways ostracods obtain food, including grazing, filtering, and scavenging. Feeding strategies differ across ostracod species and help explain their roles in aquatic food webs.
Paleoenvironmental reconstruction : The inference of past environmental conditions from geological and fossil evidence. Ostracod species and shell chemistry can indicate past salinity, temperature, and water depth.
Podocopida : A diverse order of ostracods, many of which have calcified shells and are common as fossils. Podocopids make up a large share of ostracod fossils used in geological studies.
Biomineralization : The process by which organisms produce mineralized structures such as shells and skeletons. Ostracod shell composition depends on biological mineral production as well as environmental conditions.
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