Annelida+6th+period

=Annelida= by Yael Cruz,Anthony Parkinson,Itzel Sanchez



|| //Kingdom ////: //Animalia

//Phylum: //Annelida



**Bilaterally:** means that you can only cut them in half one way and still have them be the same in both sides. As seen in the image to of the worm being cut in half. The same goes for all of the sub classes under Annelida seeing that they all are some sort of worm.

__**Animals:**__ >> > length 3in-12in >> > ringed or segmented >> >head is blackish-red and bears no tentacles or bristles > >> >Male and Female >> >Male pores and Female pros >> >segmented body >  > body is composed of 34 segments > have an anterior (oral) sucker formed from the first six segments of their body >have the body of a worm >flat spoon like skin coming out of there head >> >1in-20in >> >can be gray or brown >> >segmented body >> >have bristles __**Classes under Annelida**__
 * lugworms:marine animals under the class of Polychaeta
 * earthworms:marine animals under the class of Clitellata
 * leeches :marine animals under the class of Clitellata
 * Spoon worms:animals under Echuria
 * Bristle worms:animal under polychaeta

 Annelida has many classes under it them being Class Polychaeta,Class Clitellata,Class Myzostomida,Class Echiura.

__**Polychaeta:**__ These are worms that like more of a marine environment in which to live in they each body segment has a pair of fleshy protrusions called parapodia that has many little hairs or bristles which are called chaetae. Some example of this class include lugworm and sandworm > <span style="font-family: Verdana,Arial,Helvetica,sans-serif;">__**Clitellata:**__ Like the polychaeta they like to be around marine environments but unlike the polychaeta they do not have parapodia and their heads are less developed. Some of the animals in this class are earthworms and leeches. > <span style="font-family: Verdana,Arial,Helvetica,sans-serif;">**__Myzostomida__:** Another type of marine worm smaller then the rest A typical myzostomid has a flattened rounded shape, with a thin edge drawn out into radiating hairs called cirri. Some of the examples for this is most parasitic worms > <span style="font-family: Verdana,Arial,Helvetica,sans-serif;">__**Echiura:**__Are a small group marine animals that are considered one of the groups even though they do not have the segmented structure that was found in other members of this group. >
 * More than 10,000 species are described in this class
 * live in the coldest ocean temperatures of the abyssal plain
 * comprise around 8,000 species
 * live on land, in freshwater and in the ocean
 * were first discovered by Friedrich Sigismund Leuckart in 1827
 * no vascular system
 * <span style="font-family: Verdana,Arial,Helvetica,sans-serif;">Like to live in borrows in the sand or mud
 * <span style="font-family: Verdana,Arial,Helvetica,sans-serif;">others live in rocks and coral
 * <span style="font-family: Verdana,Arial,Helvetica,sans-serif;">lives off the southern coast

__**How it’s Successfu**__l Many parts have made the annelid phylum successful. Their segmented bodies make it move using a process called peristalsis, which is contraction and retraction of segments to inch the body along. These segments have two whole body cavities and their own circulation systems. Some species of annelids have hairs that are used in movement and others even appendages. One group of annelids are hirudinea, or leeches, which are quite peculiar for annelids. They have a jaw that is six segments large and are notorious for being bloodsuckers. In actuality, only some leeches are bloodsuckers and those that are use a strong anesthetic to suck its host’s blood. Another thing that differentiates leeches is that, unlike any other annelid, they are known to nurture their young and provide food, transportation, and shelter for the baby leeches.

__**Body Cavity**__ Members of the Annelid phylum have a body cavity. Coelomates are organisms with a body cavity, like annelids and most other animals. In a coelomate there is space where the organs stay and are suspended, guts and other organs are given much more space. Annelids are also the closest evolutionally to not being coelomates and are just steps above being psudocoelomates. Another note is that annelids have two body cavities per segment, and multiple segments, meaning that there are tens of body cavities in every annelid.

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