What distinguishes cnidarians from other animals?
Cnidarians are distinguished from all other animals by having cnidocytes that fire harpoon like structures and are usually used mainly to capture prey. In some species, cnidocytes can also be used as anchors.
What are five characteristics of cnidarians?
Characteristics of Cnidaria:
- Radially Symmetrical.
- Body multicellular, few tissues, some organelles.
- Body contains an internal cavity and a mouth.
- Two different forms exist, medusa and polyp.
- Reproduction is asexual or sexual.
- Has a simple net like nervous system.
- Has a distinct larval stage which is planktonic.
What characteristics is common of cnidarians?
Common features of cnidarians include radially symmetrical diploblasts with true tissues and nematocysts. Cnidarians reproduce both sexually and asexually.
Are Cnidaria multicellular?
Cnidaria, phylum of multicellular, radially symmetrical invertebrates (eg, hydroids, jellyfish, sea anemones, corals) dating to late Precambrian era (630-570 million years ago).
Do cnidarians have a skeleton?
Cnidarians have a hydrostatic skeleton. The contractile fibers act against the fluid-filled gastrovascular cavity. The movements are like a balloon; the animal can be short and thick or long and thin. Cnidarians have a saclike gut and extracellular digestion.
What new developments do cnidarians have that Poriferans do not?
Another feature that makes a Cnidarian more complex than an organism in the phylum Porifera is motility, Poriferans can not move, this makes it difficult to hunt prey which is why they use filter feeding to collect nutrients out of the water! Another way Cnidarians once again prove to be superior to Poriferans is they …
What organism is an animal but not a Eumetazoa?
What organism is an animal, but not a eumetazoa? the protist kingdom. Mosses do not have xylem or phloem tissue in their body systems. They cannot circulate water well, and they lack true roots, stems, and leaves.
Are all Bilaterians Coelomates?
Most animals are bilaterians, excluding sponges, ctenophores, placozoans and cnidarians. For the most part, bilateral embryos are triploblastic, having three germ layers: endoderm, mesoderm, and ectoderm….Bilateria.
| Platyhelminthes and allies | |
|---|---|
| Lophotrochozoa | Mollusca Annelida and allies |
| 550 mya |