Zoology

Zoology

The scientific study of the animal kingdom, including extinct and possibly mythical beings.

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Zoology > Zoological terms

cilium

Zoology; Zoological terms

(pl. cilia, long eyelash) A short, centriole-based, hairlike organelle: Rows of cilia propel certain protista. Cilia also aid the movement of substances across epithelial surfaces ...

telolecithal

Zoology; Zoological terms

(yolk concentrated on the vegetal pole) undergoes total but unequal cleavage, the large mass of yolk remains undivided; therefore termed partial or meroblastic .

centrolecithal

Zoology; Zoological terms

(yolk formed as a central mass) cytoplasma is concentrated in the periphery; cleavage takes place only in the outer shell, consequently typed as superficia

isolecithal

Zoology; Zoological terms

(little yolk equally distributed throughout cytoplasma) 1 st cleavage follows the primary axis, passing from animal to vegetal pole, producing a two-celled embryo; said to be ...

radial cleavage

Zoology; Zoological terms

(mostly resulting in deuterostomes , mouth comes second ); cleavage planes are alternately vertical and horizontal so that the cells are stacked in rows one upon another

spiral cleavage

Zoology; Zoological terms

(mostly resulting in protostomes , mouth comes first); embryonic development follows several patterns characterizing a grouping of phyla

coelenterata

Zoology; Zoological terms

(Gk. Coel, hollow + enteron, gut) A phylum of animals with radially symmetrical bodies, a saclike internal cavity, tentacles, and nematocysts, including jellyfish, hydras, sea ...