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Animal Diversity Lab 1 Terms To know

Terms in this set (24)

Osculum
A large opening on a sponge through which filtered water is expelled
Spicule
a needle of silica or calcium carbonate in the skeleton of some sponges
ostium
one of the small openings in a sponge's body through which water enters
choanocyte
collar cells; it creates a current that draws water in through the
pores and out through the osculum.
spongocoel
the central cavity of a sponge
asconoid
1 of 3 body patterns for sponges; stalk-like spongocoel covered with a single layer of choanocytes.
syconoid
have a tubular design similar to the ascon sponge, but the body wall is folded. The "folds" form radial canals. Choanocytes line the radial canals rather than the spongocoel.
leuconoid
represent the most complex body form. The canal system is extensively branched. Small incurrent canals lead to flagellated chambers lined by choanocytes.
Radial Symmetry
body parts arranged in a circle around a central point, as found in animals such as jellyfish and sea urchins
Bilateral Symmetry
Body symmetry in which a central longitudinal plane divides the body into two equal but opposite halves. like the human body or that of higher animals.
Cephalization
concentration of sense organs and nerve cells at the front of an animal's body w/ bilateral symmetry; i.e. the head
Incomplete Digestive System
a single opening to a pouch-like cavity serves as both mouth and anus
Complete Digestive system
two openings one for food and the other for waste
Diploblastic
animals that have only an endoderm and an ectoderm, 2 primary germ layers. i.e. animals that have developed this: cnidarians & ctenophores
Triploblastic
has three germ layers: the ectoderm, endoderm, and mesoderm. i.e. All higher and intermediate animals (from flat worms to humans)
Coelom
the body cavity
Acoelomate
an animal that lacks a coelom, or body cavity
Pseudocoelomates
Tissue derived from mesoderm only partly lines the fluid filled body cavity of these animals.; false cavity; i.e. rotifers, pinworms, and horsehair worms
Blastopore
The opening of an embryo's central cavity in the early stage of development. 2 major groups of animals: protostomates & deuterostomates
Lophotrochozoa
a large clade consisting of serveral interesting phyla. The best known phyla within this clade is Platyhelminthes (flatworms), Rotifera (rotifers), Mollusca (snails, oysters, and squid), and Annelida (segmented worms).
Ecdysozoa
is a clade consists of arthropoda (crabs, insects) and Nematoda (roundworms)
Metazoa
A major division of the animal kingdom that comprises all animals other than protozoans and sponges. They are multicellular animals with differentiated tissues.
Eumetozoa
a clade comprising all major animals groups except sponges, placoazoa and several other little known animals.
Radiata
animals with radial symmetry
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