Zoology

Zoology

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Zoology

Mammilla

Biology; Zoology

In eggshell, the cone-like structure at the base of the shell unit where the shell unit attaches to the inner organic membrane.

Lophophore

Biology; Zoology

Complex ring of hollow tentacles used as a feeding organ. The tentacles are covered by cilia, which generate a current to bring food particles into the mouth. The structure is only found in the ...

Gnathobase

Biology; Zoology

The expanded and hardened base of the appendage of many arthropods, notably trilobites, crustaceans, and marine cheliceramorphs. Used to macerate food items before ingestion.

A slitlike or porelike opening connecting the pharynx of a chordate with the outside of the body. Gill slits may contain the gills and be used for gas exchange, as in most fish, but may also be used ...

Gill arches

Biology; Zoology

Stiffenings which support the flesh between the gill slits of chordates. In most vertebrates, the first gill arches have been modified to form the jaw, and in tetrapods, the inner ear bones.

Gill

Biology; Zoology

In aquatic animals, highly vascularized tissues with large surface area; these are extended out of the body and into the surrounding water for gas exchange.

Diapsid

Biology; Zoology

A vertebrate distinguished by a skull with two pairs of openings in the side behind the eyes, e.g., lizards, snakes, crocodiles, dinosaurs, and pterosaurs.