Animalscaretips
- What is the dominant form of a scyphozoa?
- Do animals in scyphozoa have a polyp form?
- What is the life cycle of scyphozoa?
- What is the polyp phase?
- What animals belong to class Scyphozoa?
- What do all Scyphozoa have in common?
- What is the difference between Hydrozoa and scyphozoa?
- What is one major difference between Class scyphozoa and anthozoa?
- What is the polyp stage like of Anthozoans?
- Why are scyphozoa called true jellyfish?
- Why do so many cnidarians have both medusa and polyp stages during their life cycle?
- What is the function of Cnidocytes?
- Which organism possesses both a polyp and medusa phase of life?
- What is a polyp in animals?
- How do polyps differ from medusa's?
What is the dominant form of a scyphozoa?
They undergo alternation of generations, with the medusa form being dominant.
Do animals in scyphozoa have a polyp form?
Scyphozoans have separate sexes and form planula larvae through external fertilization. Jellies exhibit the polyp form, known as a scyphistoma, after their larvae settle on a substrate; these forms will later bud-off and transform into their more prominenent medusa forms.
What is the life cycle of scyphozoa?
Most scyphozoan jellyfishes—including most of the large jellyfish with which many people are familiar—have a two part life cycle: free-swimming medusa and bottom-dwelling polyp (although there are notable exceptions).
What is the polyp phase?
Polyp: Polyp is a sessile life cycle stage of species who belong to phylum cnidaria. Famous examples of polyp are sea anemones and adult corals. Polyp is formed with a mouth surrounded with tentacles, referred to as a head and head is attached to the bottom with a foot-like disk.
What animals belong to class Scyphozoa?
The class Scyphozoa can be found in the phylum of Cnidaria, the phylum of the “stinging” creatures, such as jellyfish. There are approximately 200 species that belong to the class Scyphozoa, and they are the most familiar of the gelatinous creatures of our world. These include, sea nettles, moon jellies and jellyfish.
What do all Scyphozoa have in common?
Scyphozoans share a number of attributes with other cnidarians: (1) they typically possess tentacles, (2) their symmetry is radial, (3) the body wall consists of an outer epidermis and inner gastrodermis, separated by a layer of jelly-like mesoglea, (4) the mouth is the only opening to the digestive system, (5) ...
What is the difference between Hydrozoa and scyphozoa?
Differences between a Scyphozoan & Hydrozoan medusae? Schyphozoans - More 'jelly & 4 oral arms. Hydrozoans - No oral arms. Have a velum ring & less jelly (fold up when preserved).
What is one major difference between Class scyphozoa and anthozoa?
The anthozoans, the sea anemones and corals, are all sessile species, whereas the scyphozoans (jellyfish) and cubozoans (box jellies) are swimming forms. The hydrozoans contain sessile forms and swimming colonial forms like the Portuguese Man O' War.
What is the polyp stage like of Anthozoans?
Unlike other cnidarians, anthozoans do not have a medusa stage in their development, they live exclusively as polyps throughout their life cycles. Instead, they release sperm and eggs that form a planula, which attaches to some substrate on which the cnidarian grows.
Why are scyphozoa called true jellyfish?
The Scyphozoa are an exclusively marine class of the phylum Cnidaria, referred to as the true jellyfish (or "true jellies"). ... The class name Scyphozoa comes from the Greek word skyphos (σκύφος), denoting a kind of drinking cup and alluding to the cup shape of the organism.
Why do so many cnidarians have both medusa and polyp stages during their life cycle?
Some cnidarians are dimorphic, that is, they exhibit both body plans during their life cycle. In these species, the polyp serves as the asexual phase, while the medusa serves as the sexual stage and produces gametes.
What is the function of Cnidocytes?
Cnidocytes ('stinging cells') are specialized cells that define the phylum Cnidaria (sea anemones, jellyfish, corals and hydras). They contain an “explosive” organelle called cnidocyst that acts as a 600 million-years-old microscopic injection system and is important for prey capture and anti-predator defense.
Which organism possesses both a polyp and medusa phase of life?
They are the most primitive of animals whose cells are organized into distinct tissues, but they lack organs. Cnidarians have two body forms—polyp and medusa—which often occur within the life cycle of a single cnidarian. Sea nettle (Chrysaora fuscescens).
What is a polyp in animals?
polyp, in zoology, one of two principal body forms occurring in members of the animal phylum Cnidaria. The polyp may be solitary, as in the sea anemone, or colonial, as in coral, and is sessile (attached to a surface). ... The lower end of the polyp typically is adapted for attachment to a surface.
How do polyps differ from medusa's?
Polyp and medusa present some major differences:
Polyp are sessile while medusa are mobile. Polyp present a tubular shape with the mouth facing the water upwards,while medusa present a bell shape with the mouth facing the water downwards. ... Polyp produce either polyp or medusa by budding, while medusa produce only medusa ...
