simple invertebrate Flashcards
Porifera
Poriferans are commonly referred to as sponges. An early branching event in the history of animals separated the sponges from other metazoans
Cnidaria
These flower-like animals resemble plants, but they have a mouth … The phylum Cnidaria
Annelida
The annelids include earthworms, polychaete worms, and leeches. All members of the group are to some extent segmented,
Hydroid
Hydroids are a life stage for most animals of the class Hydrozoa, small predators related to jellyfish.
Jellyfish
have drifted along on ocean currents for millions of years, even before dinosaurs lived on the Earth
Platyhelminthes
Flatworms are unsegmented, bilaterally symmetrical worms that lack a coelom (acoelomate) but that do have three germ layers. Some forms are free living but many are parasitic.
Nematoda
Roundworms (nematodes) are bilaterally symmetrical, worm-like organisms that are surrounded by a strong, flexible noncellular layer called a cuticle. Their body plan is simple.
Pinworms
infections are the most common worm infection in America. … Symptoms are worse at night when the female worms are most active and crawl out of the anus to deposit their eggs
Tapeworms
are flat segmented worms that live in the intestines of some animals. Animals can become infected with these parasites when grazing in pastures
Bivalves
nclude clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater. The majority are filter feeders. The gills have evolved into ctenidia, specialised organs for feeding and breathin
Cephalopods
are the most intelligent, most mobile, and the largest of all molluscs. Squid, octopuses, cuttlefish, the chambered nautilus, and their relatives
Gastropods
feeding on dead plant or animal matter; others are predators; some are herbivores, feeding on algae or plant material; and a few species are external or internal parasites of other invertebrates.
Limpet - Bellerophon - Media
Coelomate
animals or Coelomata (also known as eucoelomates — “true coelom”) have a fluid filled body cavity called a coelom /ˈsiːləm/ with a complete lining called peritoneum derived from mesoderm (one of the three primary tissue layers).
Acoelomate
an invertebrate lacking a coelom; especially : one belonging to the group comprising the flatworms and nemerteans and characterized by bilateral symmetry and a digestive cavity that is the only internal cavity.
Radial Symmetry
arrangement of parts of an organism around a single main axis, so that the organism can be divided into similar halves by any plane that contains the main axis.
Asymmetry
lack of equality or equivalence between parts or aspects of something; lack of symmetry.
Bilateral Symmetry
arrangement of an organism or part of an organism along a central axis, so that the organism or part can be divided into two equal halves.
Tentacle
a slender flexible limb or appendage in an animal, especially around the mouth of an invertebrate, used for grasping, moving about, or bearing sense organs.
Cnidocyte
is an explosive cell containing one giant secretory organelle or cnida (plural cnidae) that defines the phylum Cnidaria
Ectoderm
is one of the three primary germ layers in the very early embryo. The other two layers are the mesoderm (middle layer) and endoderm (most proximal layer), with the ectoderm as the most exterior (or distal) layer. It emerges and originates from the outer layer of germ cells.
Endoderm
the innermost layer of cells or tissue of an embryo in early development, or the parts derived from this, which include the lining of the gut and associated structures.
Ovary
a female reproductive organ in which ova or eggs are produced, present in humans and other vertebrates as a pair
Teste
balls
