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Transcript of Invertebrates
A quick overview
Poriferans are commonly referred to as sponges. An early branching event in the history of animals separated the sponges from other organisms. There are approximately 5,000 living sponge species. A key characteristic of sponges is all are aquatic and
(no symmetry). Because they are asymmetrical, they do not have segmentation.
Sponges are also characterized by being
(no backbone). Additionally they reproduce
through fragmentation or budding.
Annelids are all of the
means their body is broken into individual sections/parts.
When you're on land, you gotta move. You gotta get to food. You gotta hide from predators. You gotta find other worms to reproduce. Speaking of reproduction, most annelids reproduce
, but in extreme circumstances, they can reproduce asexually!
All chordates have bilateral symmetry and reproduce sexually. Our segmentation is found in our spines. Each vertebrae is a segment in our body. There are five major groups of vertebrates: fish, amphibians, reptiles, birds and mammals.
Cnidarians are incredibly diverse in shape and form. This evidenced (seen) by looking at the many different types of corals, hydroids, and jelly fish. All cnidarians have
The name Cnidaria comes from the Greek word "cnidos," which means stinging nettle. Casually touching many jelly fish will make it clear how they got their name when their nematocysts eject barbed threads tipped with poison.
do not have segmentation
The simplest animals that are bilaterally symmetrical are the Platyhelminthes, the flatworms. Flatworms have no body cavity other than the gut and lack an anus. The lack of a body cavity makes flatworms to be flat
Flatworms are hermaphrodites. This means they contain both male and female parts for
. When needed a flatworm can “change sex”. They have
All mollusks have
symmetry. This means you can cut a mollusk in half and it will look the same on both side. Mollusks
do not have segmentation
All mollusks reproduce
. Land mollusks, like snails, fertilize their eggs internally. Aquatic mollusks, like octopi, fertilize their eggs externally. Some species of snails are hermaphrodites (both male and female).
symmetry as adults, but are
as young! Echinoderms also have 5 segments! They also have
. There are separate sexes. Fertilization occurs outside the body, in the ocean. The larvae of echinoderms, are bilateral and will swim freely. The larva will settle to the bottom of the ocean for metamorphosis into an adult.
They reproduce very quickly using sexual reproduction. They are bilaterally symmetrical and invertebrates
The easiest way to tell an arthropod from any other animal is to see if they have:
1) A segmented body.
2) Many jointed legs or limbs.
3) An exoskeleton.
4) Cold blooded