Hence these five backboned classes may be brought together into a higher group called a branch or phylum.
Little by little the phylum has been shorn of orders and classes.
phylum, or stem, the sum total of all those organisms which have probably descended from one common lower form.
Luminescence is more widespread in this phylum and more characteristic of the group as a whole than any other.
The critical point in the history of this phylum is passed when its members migrated from water to the land.
We may profitably use it only as a lay figurea sort of manikin, which will introduce us to the phylum.
The phylum also includes, as one of its large suborders, all the snails and slugs that are to be found crawling upon the land.
As accepted by zologists to-day, this phylum is but the remnant of its former self.
The higher animals begin with the twelfth phylum, namely, the Chordata, or vertebrates.
We have listed the organisms known to be associated with cockroaches systematically by phylum, class, order, and family.
"division of the plant or animal kingdom," 1868, Modern Latin, coined by French naturalist Georges Léopole Chrétien Frédéric Dagobert, Baron Cuvier (1769-1832) from Greek phylon "race, stock," related to phyle "tribe, clan" (see physic). The immediate source of the English word probably is from German.
phylum phy·lum (fī'ləm)
n. pl. phy·la (-lə)
A taxonomic category that is a primary division of a kingdom and ranks above a class in size.
A group of organisms ranking above a class and below a kingdom. See Table at taxonomy.