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Cnidaria is a phylum containing over 10,000 species of animals found exclusively in aquatic ... They have two basic body forms: swimming medusae and sessile polyps, both of which are radially symmet...

What is a sessile form of a jellyfish called - Answers.com


Why wouldn't a jellyfish form a fossil? ... What is the sessile body form of a cnidarian? ... It is called a jellyfish because it lives in the sea, although it isn't a fish.

The Life Cycle of a Jellyfish - Animals & Wildlife - About.com


The medusa form is the dominant and most recognized form of the jellyfish. ... This polyp stage in the jellyfish life cycle is a sessile stage, so called because the  ...

Cnidaria - jelly fish, polyps and medusae - Bumblebees


Cnidaria - jelly fish, polyps and medusae taxonomy, physiology, and body pattern . ... sexually from medusae. Most medusae are mobile and the polyps tend to be sessile. ... They are located in special cells called cnidocytes. There are over ... Some species form a symbiotic relationship with green algae. Many species are ...

sponges & cnidarian notes b1 - Biology Junction


Flagellated cells called choanocytes or collar cells line their internal body cavity ... Polyp forms are usually sessile with upright tentacles arranged around the mouth at the top and ... Jellyfish & Portuguese man-of-war are medusa form as adults.



Sea anemones and corals have the polyp form, while jellyfish are typical medusae. ... Cnidarians are classified into four main groups: non-moving (sessile ) ... layers (the ectoderm and the endoderm) separated by a jelly-like layer called the ...

Phylum - Cnidaria (Jellyfish, Anemones, Corals ... - Exploring Nature


jellyfish, hydra, sea anemones, and corals. Though these vary greatly, ... The “ polyp” form is usually anchored (sessile) with the mouth facing upward. ... These layers surround an inner cavity called the gastrovascular cavity. The epidermis ...

28.2: Phylum Cnidaria - BioWiki


Dec 1, 2015 ... Cnidocytes contain large organelles called (a) nematocysts that store a coiled ... Figure 28.2.3: The sessile form of Obelia geniculate has two types of polyps: ... ( jellyfish) and cubozoans (box jellies) are swimming forms.

Polyps and Medusas - Shmoop Biology


The two phyla with the radial body plan like a pumpkin are called the radiata and ... While we wouldn't call a jellyfish quick, they can—unlike sponges—move a little under their own power. ... During gastrulation, an embryo begins to form layers that will become the ... The polyp is a shaped like a tube and is generally sessile.

jellyfish | marine invertebrate | Britannica.com


Apr 6, 2015 ... The sessile polyplike forms constitute the order Stauromedusae. ... region, but members of the genus Rhizostoma, also called football jellyfish, ...

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Cnidaria Facts, information, pictures | Encyclopedia.com articles ...


It includes aquatic organisms such as jellyfish, sea anemones, corals, and hydras . ... is surrounded by tentacles and leads to an internal digestive cavity called the .... The sessile hydroid, or polyp, form is more or less cylindrical, attached to its ...

Phylum Cnidaria - OpenStax CNX


Animals from the phylum Cnidaria have stinging cells called cnidocytes. ... The sessile polyp form has, in fact, two types of polyps, shown in Figure. The first is the .... Part a shows a photo of a bright red jellyfish with a dome-shaped body ...

Jellyfish life cycle (Scyphozoa) - The Scyphozoan


Most scyphozoan jellyfishes—including most of the large jellyfish with which ... a sessile (i.e. fixed-position), usually benthic (i.e. bottom dwelling) polyp called a ...