What's the difference between cirriped and cirripedia?

Cirriped

Definition:

• (n.) One of the Cirripedia.

Example Sentences:

• (1) Such an arrangement was found not only in other calanoid copepod species but also in a cirriped, an euphausid, and a spider.

Cirripedia

Definition:

• (n. pl.) An order of Crustacea including the barnacles. When adult, they have a calcareous shell composed of several pieces. From the opening of the shell the animal throws out a group of curved legs, looking like a delicate curl, whence the name of the group. See Anatifa.

Example Sentences:

• (1) Fish from the north-east Atlantic, including neighbouring aquens are host of 3 species of Branchiura, 163 Copepoda, 37 Isopoda, 2 Amphipoda, and 1 of parasitic Cirripedia.