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The difference between most hydrozoans and most scyphozoans is that in hydrozoans, the polyp stage usually predominates, with the medusa small or sometimes absent.
Often, the medusa never breaks away from the parent polyp, and remains in a state of arrested development, although its gametes function. Such a medusa is referred to as a sporosarc.
In scyphozoans, the medusa stage is typically large and free-living, with the polyp stage small.
However, there are exceptions - certain hydrozoans known as the Trachylina never form a polyp stage. Free-living medusoid hydrozoans can be hard to tell from scyphozoans, but hydrozoan medusae generally have a muscular shelf, or velum, projecting inward from the margin of the bell.
This structure is not found in scyphozoans. Hydrozoans also lack cells in the mesoglea, the jelly layer found between the basic cell layers, whereas scyphozoans contain amoeboid cells in the mesoglea.
Another feature that is quite common in Hydrozoa but not typical of Scyphozoa is colonial organization.
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Are what is the difference between a sissile polyp and a flat polyp. cause cancer?
Is there a difference between a sissile polyp and a flat polyp. Can either one be a cause of cancer
How do hydras differ from other cnidarians the class Hydrozoa?
Most hydras alternate between an asexual polyp stage and a sexual medusa stage, though the best-known Hydrozoan, Hydra, never becomes a medusa, spending its whole life as a polyp.
A hydrozoan that is actually a colony of four types of special polyps that depend each other for survival?
This hydrozoan is likely a "Portuguese Man o' War" (Physalia physalis). It consists of gas-filled float, feeding polyps, reproductive polyps, and defensive polyps. Each polyp performs a specific function that contributes to the overall survival of the colony.
What is a hydrozoan body plan?
The hydrozoan body plan typically consists of a simple, two-layered structure known as a diploblastic body, comprising an outer epidermis and an inner gastrodermis, with a gelatinous mesoglea in between. Hydrozoans can exhibit two main forms: the polyp, which is sessile and usually cylindrical, and the medusa, which is free-swimming and umbrella-shaped. They possess a central gastrovascular cavity for digestion and a network of cnidocytes that contain stinging cells for capturing prey and defense. This versatile body plan allows hydrozoans to thrive in various aquatic environments.
What does hydrozoan mean?
Hydrozoan refers to a class of small, predominantly marine animals within the phylum Cnidaria, which also includes jellyfish and corals. They are characterized by their polyp and medusa life stages, often exhibiting a colonial lifestyle. Hydrozoans can be found in various aquatic environments and are known for their diverse forms, including both solitary and colonial species. Examples include the common Portuguese man o' war and the hydra.
What is a Portuguese man-of-war a example of?
A Portuguese Man'o War, Physalia physalis, is the best known siphonophore hydrozoan cnidarian. It is a colonial cnidarian that floats at the surface of tropical and subtropical oceans by means of a highly modified, gas-filled polyp. It is also infamous for its powerful venomous sting.
What has a vase shaped cnidarian body type?
It is a polyp. Good question!
Is a moon jelly a Medusa or a polyp?
polyp
Are polyp is vertebrates or invertebrates?
Polyp is invertebrate .
What is term for A mushroom like growth extending on a stalk from the surface of a mucous membrane?
The term for a mushroom-like growth extending on a stalk from a mucous membrane is called a polyp.
Describe the main differences between the polyp form of the cnidarians and the medusa form?
adda
How do you get pregnant if you have endometrial polyp?
can i get pregnant with endometrial polyp
