Introductory Zoology - Kingdom Animalia

Flashcards covering key concepts in the classification of animals within the Kingdom Animalia.

What are the three broad groups of the Kingdom Animalia?

Parazoa, Radiata, Bilateria.

How many recognized phyla are there in the Kingdom Animalia?

36 recognized phyla.

What is the significance of body symmetry in classification?

Body symmetry helps distinguish one phylum from another and defines evolutionary relationships.

What is asymmetry in animals?

Asymmetry means having no definite shape, as seen in Porifera.

What is radial symmetry?

Radial symmetry is when body parts are arranged around a central axis, allowing division into similar halves.

What is bilateral symmetry?

Bilateral symmetry is when left and right halves of an animal are mirror images, resulting in cephalization.

What type of animals are radially symmetrical?

Cnidarians and echinoderms.

What are some advantages of bilateral symmetry?

It provides balance for movement and allows damaged body parts to rely on identical parts on the other side.

What is the main characteristic of acoelomates?

Acoelomates do not have a body cavity, only a gut.

What are pseudocoelomates?

Pseudocoelomates have a body cavity that is not completely lined with mesoderm.

What do coelomates possess?

Coelomates have a true body cavity lined with mesoderm.

What are protostomes?

Protostomes are animals in which the blastopore forms the mouth first.

What are deuterostomes?

Deuterostomes are animals in which the blastopore forms the anus first.

What is an exoskeleton?

An exoskeleton is an external skeleton, characteristic of arthropods.

What is an endoskeleton?

An endoskeleton is an internal skeleton, found in chordates and echinoderms.

What is the significance of a closed circulatory system?

In a closed circulatory system, blood is enclosed in vessels, allowing for efficient transport.

What is a nerve net?

A nerve net is a simple nerve network characteristic of Cnidaria.

What is hermaphroditism?

Hermaphroditism is when an organism possesses both male and female reproductive organs.

Define qui doesn't have a backbone.

Invertebrates are animals without a backbone.

Give an example of a phylum with the simplest animals that lack true tissues.

Phylum Porifera (sponges).

Which phylum is characterized by having stinging cells?

Phylum Cnidaria (jellyfish and corals).

What defines the phylum Annelida?

Annelida is characterized by a segmented body and a true coelom.

Which phylum includes mollusks?

Phylum Mollusca includes snails, clams, and octopuses.

What is unique about the phylum Arthropoda?

Arthropoda is the largest phylum characterized by segmented bodies and jointed appendages.

Which phylum is known for having a water vascular system?

Phylum Echinodermata (sea stars and sea urchins).

What are the key features of the phylum Chordata?

Chordata includes a notochord, dorsal nerve cord, pharyngeal slits, and a post-anal tail.