Aplacophora :: Aplacophora (n. pl.) A division of Amphineura in which the body is naked or covered with slender spines or setae, but is without shelly plates..

Placoderm :: Placoderm (n.) One of the Placodermi.

Placodermal :: Placodermal (a.) Of or pertaining to the placoderms; like the placoderms.

Placodermata :: Placodermata (n. pl.) Same as Placodermi.

Placodermi :: Placodermi (n. pl.) An extinct group of fishes, supposed to be ganoids. The body and head were covered with large bony plates. See Illust. under Pterichthys, and Coccosteus..

Placoganoid :: Placoganoid (a.) Pertaining to the Placoganoidei.

Placoganoidei :: Placoganoidei (n. pl.) A division of ganoid fishes including those that have large external bony plates and a cartilaginous skeleton.

Placoid :: Placoid (a.) Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids..

Placoid :: Placoid (n.) Any fish having placoid scales, as the sharks..

Placoid :: Placoid (n.) One of the Placoides.

Placoides :: Placoides (n. pl.) A group of fishes including the sharks and rays; the Elasmobranchii; -- called also Placoidei.

Placoidian :: Placoidian (n.) One of the placoids.

Placophora :: Placophora (n. pl.) A division of gastropod Mollusca, including the chitons. The back is covered by eight shelly plates. Called also Polyplacophora. See Illust. under Chiton, and Isopleura..

Polyplacophora :: Polyplacophora (n. pl.) See Placophora.

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