Chapter 32: An Overview of Animal Diversity
Terms in this set (39)
Animals can be categorized according to a ___________ or the _________ of their bodies or how they lack it.
a set of morphological and developmental traits.
-no front and back or left and right.
-as long as you cut through the middle you get mirror images.
-examples include: sea anemone, octopus, sea stars, and jellies
bilateral symmetry or two sided symmetry
-a top or dorsal side
-bottom or ventral side
-right and left side
-anterior or head
-posterior or end
-can only cut in one plane in order to get mirror images
-examples include lobster, human, butterflies, shrimp
radial symmetrical animals have
planktonic ability to float or sessile
sensory equipment located in the anterior end and is known as the central nervous system in which animals move actively.
collections of specialized cells isolated from other tissues by membranous layers
3 germ layers
do sponges have true tissue?
no they lack true tissue
germ layer covering the embryo's surface
the innermost germ layer and lines the developing digestive tube, called archenteron
-have and ectoderm and endoderm
-examples: cnidarians i.e. jellies and hydra and comb jellies
-have an intervening mesoderm layer
-includes all animals with bilateral symmetry
-examples: flatworms, anthropods, vertebrates
gives rise to outer covering of animals central nervous system
give rise to muscles, connective tissue, and blood cells
all triploblastic animals have _________ and _________.
true body cavity derived from mesoderm
posses a true coelom
derived from a mesoderm and endoderm
triploblastic animals possess a pseudocoelom called
An earth worm is an example of a _______.
A round worm is an example of a _________.
A planarian is an example of a
tripioblastic animals that lack a body cavity.
destined for specific function
doesn't have a specific function
cleavage is spiral and determinate
cleavage and radial and indeterminate
in protostome development the coelom forms by ________.
the splitting of solid masses of mesoderm
in deuterostome development the coelom forms by_______.
mesoderm buds from the wall of the archenteron
When does the blastopore form?
connects the archenteron to he exterior of the gastrula
in protostome development the blastopore becomes the _______.
in deuterostome development the blastopore becomes the _______.
Zoologists currently recognize about _____ animal phyla.
which is the clade of animals with true tissues
most animals belong to the clade
chordates and some other phyla belong to the clade