What are the main differences among porifera Cnidaria and ctenophora?
Porifera, Cnidaria, and Ctenophora are the most primitive clade of metazoans. They distinguish themselves from the other metazoans by their lack of bilateral symmetry. Inside their clade, each phylum is clearly distinguished by its general features.
Why ctenophores are not considered cnidarians?
Cnidarian medusae are said to be radially symmetrical around their oral-aboral axis, while ctenophores display a special form of biradial symmetry, with no planes of mirror symmetry but rather an infinite number of planes of rotational symmetry. Ctenophores and cnidarians differ in their mode of locomotion.
What characteristic is unique to the ctenophores?
Ctenophora Definition Ctenophores are free-swimming, transparent, jelly-like, soft-bodied, marine animals having biradial symmetry, comb-like ciliary plates for locomotion, the lasso cells but nematocytes are wanting. They are also known as sea walnuts or comb jellies.
Why are ctenophores considered more advanced than cnidarians?
Explanation: because ctenophores have better body design ., they also have bioluminescence which make them difficult to be a prey..
Which characteristic is shared by both cnidarians and ctenophores?
Both cnidarians and ctenophores are diploblastic animals. Cnidarians exhibit radial symmetry whereas ctenophores exhibit biradial symmetry. Both contain tentacles, surrounding their mouth.
What distinguishes cnidarians and ctenophores from being Triploblastic?
They might be labeled as triploblastic animals due to the following reasons: Both cnidarians and ctenophores have a gelatinous middle layer surrounded by epidermis and internal gut lining. This body is diploblastic, but the presence of cells within the middle gelatinous layer is problematic.
Which are the distinguishing characters of phylum ctenophora?
General Characteristics of Phylum Ctenophora:
- Habitat: ADVERTISEMENTS:
- Habits: They feed on plankton, swim by cilia.
- Body Form: ADVERTISEMENTS:
- Symmetry: Symmetry is biradial (radial + bilateral).
- Germ Layers: They are diploblastic having ectoderm and endoderm.
- Level of Organisation:
- Appendages:
- Body Wall:
What are the characteristics of cnidarians?
What are the Characteristics of Cnidarians?
- They are characterized by the presence of stinging cells called Cnidoblast and a cavity called coelenterates, justifying the name Cnidaria or Coelenterata.
- They are exclusively aquatic and marine.
- They are radially symmetrical and diploblastic animals.
What characteristics of ctenophores cause zoologists to classify them in a separate phylum from cnidarians?
Cnidarians have stinging cnidocytes for feeding while Ctenophores have colloblasts which are sticky cells used to capture prey.
Which characteristic do flatworms and cnidaria have in common?
Answer: The answer is D: a digestive system with a single opening. Cnidarians and flatworms have a digestive system with a single opening.
What are two differences between the jellyfish and ctenophores?
Unlike jellyfish, ctenophores don’t have any stinging cells. Instead, they are equipped with colloblasts, sticky cells which trap prey by squirting glue onto them. However, there is an exception to this rule: One particular species of ctenophores (Euchlora rubra) does indeed possess real stinging cells.
