Protoceratops is a genus, and thus there are no further 'groups' within that taxonomic level. There are two species, P. andrewsi and P. hellenikorhinus.
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Protoceratops belongs to the Ceratopsidae family, which is further divided into subfamilies such as Protoceratopsinae and Ceratopsinae. These subgroups are based on differences in skull anatomy, size, and other characteristics among different species of Protoceratops and related dinosaurs.
The subgroups of phylum are classes. Phylum is a taxonomic rank that is above class and below kingdom in the hierarchy of biological classification. Classes are further subdivided into orders, families, genera, and species.
The two subgroups that form a scientific name are the genus and the species. The genus comes first in the name and is capitalized, while the species is lowercase. Together, they make up the binomial nomenclature used to classify organisms.
Eucoelomata is further divided into two subgroups: Protostomia and Deuterostomia. Protostomes include groups like arthropods, annelids, and mollusks, where the blastopore becomes the mouth. Deuterostomes include chordates, echinoderms, and hemichordates, where the blastopore becomes the anus.
The biological groupings that follow the kingdom are phylum, class, order, family, genus, and species in the system of classification known as taxonomy. Each group represents organisms that share increasingly specific characteristics.
Typically, the classification level with the broadest scope, such as kingdom in biological classification or phylum in the animal kingdom, would have the most members because it encompasses multiple subgroups. These higher levels group together organisms with similar characteristics before further classifying them into more specific categories.