chitinozoan
Chitinozoans are an extinct group of marine planktonic organisms of uncertain taxonomic affinities. They lived during the Ordovician through the Devonian periods. Fossils of chitinozoans are typically found as small, hollow, flask-shaped or ovoid structures, ranging in size from less than a millimeter to about two millimeters. These microfossils are composed of a tough organic material, often referred to as "conchoidin," which is resistant to decomposition, allowing for their widespread preservation in the fossil record.
Their exact biological classification remains a subject of debate among paleontologists. Historically, they have been tentatively
Chitinozoans are valuable for biostratigraphy, particularly in the Paleozoic era. Their rapid evolution and widespread distribution