Invertebrates Flashcards
what are invertebrates?
animals without a backbone which display some type of symmetry
what are invertebrates?
animals without a backbone which display some type of symmetry
radial symmetry
when simular parts branch out in all directions from a central point
give examples of animals with radial symmetry
jellyfish, hydra, starfish
bilateral symmetry
simular halves on each side of a central plane
how can animals be divided?
right/left, dorsal/ventral. anterior/posterior
what do animals with bilateral symmetry tend to display?
cephalization
what is cephalization?
it means they display a brain and sensory structure(they have a head)
most animals have what type of symmetry?
bilateral
what does it mean to have segmentation?
to have simular, repeating, units
what are the two types of segmentation?
simple and complex
simple segmentation examples..
earthworm (all segments are the same as the next)
complex segmentation examples
crayfish ( segments are different and fused together to make a large head and chest segment)
what supports the body of an invertebrate?
an exoskeleton
what does an exoskeleton do?
protects the soft tissues of the body, it is made of chiten
bad parts of an exoskeleton?
limits size and movement, does not grow, has to molt to be regrown
what is phylum porifera?
its an all aquatic phyluim which are filled with pore bearing organisms.
what type of symmetry does porifera have?
asymmetrical
does porifera have tissues or organs?
no, this makes them the simplest phylum
how does porifera reproduce and get food?
gets food by filtering water through the pores and reproduces both sexually and sexually
what animals are in porifera?
has sponges
what is phyluim cnidaria?
it is an all aquatic phylum that are more specialized than sponges (more complex cells)
What do organism in Cnidaria have?
Tentacles with stinging cells called nematocysts, triggers on their tentacles release poison whenever something comes in contact with them
What type of symmetry does Cnidaria have?
radial
How do Cnidaria reproduce?
mostly sexually, some asexually through budding
what organisms can you find in cnidaria?
jellyfish, coral, sea anemones
what is phylum ctenophora?
its a small phylum of about 100 aquatic species called ctenophores
what do ctenophora look like?
they look like jellyfish, but don’t have stinging cells
what do ctenophora use to capture their prey?
they use colloblast
what is special about ctenophora?
they are iridescent, which means they capture or produce light, and they are hermaphroditic, which means they produce both egg and sperm but still reproduce sexually
what is phylum platyhelminthes?
it is a slightly more complex phylum because they have tissues and organs
what type of symmetry do playhelinthes have?
they have bilateral symmetry
what are playhelminthes often called?
flatworms (most platyhelminthes are parasites)
what species do platyhelminthes have?
fluke, plagnaria, tapeworm
what is phylum nematoda?
parasitic or free-living phylum that are often called roundworms
what type of symmetry do nematoda show?
bilateral
what organisms are in nematoda?
ascaris, hookworms, trichinella
give all the details of rotifera in one sentence
a small class that only has one species which are rotifers, they display bilateral symmetry and live in water
what is phylum molluska?
members of this are called mollusks which are soft-bodied animals
what do mollusks have?
they have a mantis that makes a shell to protect themselves
how many species of mollusks are there?
there are over 112000 species, very diverse
what type of symmetry do mollusks show?
bilateral
what are some animals in phylum mollusk?
mussel, squid, snail
what type of symmetry do organisms in phylum annelida show?
bilateral
what do annelids have?
they have segmentation
name some organisms in annelida
earthworm, leach, segmented worms
what is phylum arthropoda?
it is a phylum of arthropods that have segmented bodies with appendages(legs or antennae) that is divided into 4 subphylum’s
name the first subphylum of arthropod and tell me whats in it.
crustacea = crabs, crayfish
name the second subphylum of arthropoda and tell me whats in it
chelicerata=scorpions, spiders, ticks
name the third subphylum of arthropoda and tell me whats in it
uniramia = millapede, centipede, insects
name the 4th subphylum of arthropoda and tell me whats in it.
trilobita =extinct insects(trilobites)
what type of symmetry do organisms in echinordermata have?
radial symmetry
whats special about the organisms in echinodermata?
they have no head or cephalization
name some organisms in echinodermata
sea urchins, sand dollars, sea cucumbers
