Zoology 1st Semester

Front

Cephalization

Back

Formation of a head end of an animal with a concentration of nervous tissue and sense organs in the head region.

Front

Asconoid

Back

Simplest of all sponge canal systems; canals lead directly from outside to interior.

Front

Bilateral Symmetry

Back

Applies to animals that can be divided into two mirrored portions with definite right and left halves.

Front

Radial Symmetry

Back

Applies to forms that can be divided into similar halves by more than two planes passing through the longitudinal axis.

Front

Osculum

Back

Opening in which water leaves the sponge.

Front

Metamerism

Back

The division of an animal body into a series of repetitive segments.

Front

Coelom

Back

A fluid-filled body cavity that is completely surrounded by mesoderm.

Front

Ostia

Back

Small openings in sponges through which water enters.

Front

Choanocytes

Back

Specialized cells in sponges that help in water circulation and food capture.

Front

Mesohyl

Back

A gelatinous matrix found in sponges that contains various cells and structures.