In biology, a subphylum is a taxonomic rank intermediate between phylum and superclass. The rank of subdivision in plants and fungi is equivalent to subphylum. Biology is the branch of science dealing with the study of life. ... Linnaean taxonomy classifies living things into a hierarchy, originally starting with kingdoms. ... Phylum (plural: phyla) is a taxon used in the classification of animals, adopted from the Greek phylai the clan-based voting groups in Greek city-states. ... Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. ...
Not all phyla are divided into subphyla. Those that are include:
Ricinulei (subphylumChelicerata, class Arachnida) An order of small (5–10 mm long), slow-moving arachnids in which the cuticle is thick and often sculptured and the mouth-parts and chelicerae are covered by a hood that can be raised and lowered.
Trichostomatida (subphylum Ciliophora, class Ciliatea) An order of ciliate protozoa that are characterized by the structure of the cytostome region, where there is a ciliated depression leading into a buccal cavity lacking cilia, at the base of which occurs the cytostome.
Atelostomata (subphylum Echinozoa, class Echinoidea) A superorder of irregular echinoids characterized by the lack of compound ambulacra, Aristotle's lantern, girdle, or gill slits.
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