-InvertebrateZooLEC29 Flashcards
what are Invertebrates?
95% of known animal species that lack a backbone
what is phylum Porifera?
the simplest animals, sponges that live in both fresh and salt water
• they are sessile
• have a porous body
• lack true tissues
how many sponge species are describe?
5,000
what are the sponges’ bodies structured with?
- silica fibers called spicules
- means they also have calcium carbonate skeleton like us
most sponges are hermaphrodites. what does this mean?
each individual functions as both male and female and they can reproduce sexually or asexually.
how do sponges use Choanocyte & Amoebocytes to filter feed?
- Choanocyte create currents by beating flagella, food particles are trapped in the mucus
- Amoebocytes engulf, digest, and transport nutrients to other cells
what animals belong to the clade Eumetazoa?
all animales except sponges that has true tissues
-sponges has their own clade
what are Cnidarians? how many layers of tissue do they have?
- jellys, earliest eumetazoans with wide range of sessile and floating forms
- two, diploblastic
what is the gastrovascular cavity that cnidarians have?
a single opening acts as both mouth and anus
do cnidarians have tentacles?
yes
how many cnidarian species are describe? what type of symmetry do they all have?
ex. anemone
- 10,000
- radial symmetry
what are the sessile and floating form of cnidarians called?
polyp & medusa
are all cnidarians are carnivores? proof?
yes, they are armed with tentacles and cnidocytes for capturing prey
T or F? Many jellies are bioluminescent.
The largest are more than 100m long
true
class Hydrozoans
- have both polyp and medusa forms in life cycle, they are jelly not fish
- portuguese man-of-war
