What is the main difference between the two classes of jellyfish the Scyphozoans and the Cubozoans?
What is the main difference between the two classes of jellyfish the Scyphozoans and the Cubozoans?
Class Cubozoa Cubozoans display overall morphological and anatomical characteristics that are similar to those of the scyphozoans. A prominent difference between the two classes is the arrangement of tentacles. This is the most venomous group of all the cnidarians.
What’s the difference between Anthozoans and Medusozoans?
Medusozoans differ from anthozoans in having a medusa stage in their life cycle. The basic pattern is medusa (usually the adult or sexual phase), planula larva, polyp, medusa. Symmetry is tetramerous, with parts in fours or multiples of four.
What is the difference between polyps and medusa?
Sessile structures are called polyps while the swimming forms are called medusa. The key difference between polyp and medusa is that polyp is a fixed, cylindrical structure, representing the asexual stage and medusa is a free swimming, umbrella-like structure, representing the sexual stage.
Are scyphozoa medusa or polyp?
Jellyfish life cycle (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 makes a hydrozoa a hydrozoa?
The Hydrozoa is a subgroup of cnidarians containging approximately 3700 species. It is a diverse group with a variety of life cycles, growth forms, and specialized structures. Like many cnidarians, hydrozoans have both polyp and medusa stages in their life cycle.
What are some differences between scyphozoa and Cubozoa?
Cubozoans differ from Scyphozoans in their arrangement of tentacles; they are also known for their box-shaped medusa. Out of all cnidarians, cubozoans are the most venomous.
What is unique about class Hydrozoa?
Like all cnidarians, hydrozoans have special ectodermal cells called cnidocytes, each containing a single intracellular structure called a cnida (aka nematocyst). Cnidae are unique to the Cnidaria.
Is Physalia a medusa or polyp?
They are mainly found in bell-shaped medusa form. Physalia and Obelia have both polyp and medusa forms and they alternate between both forms during their life cycle. The correct option is (B). Polyp phase is absent in Aurelia.
Is Hydrozoa a medusa or polyp?
Like many cnidarians, hydrozoans have both polyp and medusa stages in their life cycle.
Is hydrozoa a medusa or polyp?
Is Aurelia a polyp or medusa?
Aurelia undergoes alternation of generations, whereby the sexually-reproducing pelagic medusa stage is either male or female, and the benthic polyp stage reproduces asexually….Aurelia (cnidarian)
| Aurelia | |
|---|---|
| Adult Aurelia aurita medusa | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Cnidaria |
What is the difference between Medusa and Hydrozoa?
Medusozoans are distinguished by having a medusa stage in their often complex life cycle, a medusa typically being an umbrella-shaped body with stinging tentacles around the edge. With the exception of some Hydrozoa (and Polypodiozoa), all are called jellyfish in their free-swimming medusa phase.
What are the different classes of medusozoans?
It includes the classes Hydrozoa, Scyphozoa, Staurozoa and Cubozoa, and possibly the parasitic Polypodiozoa. Medusozoans are distinguished by having a medusa stage in their often complex life cycle, a medusa typically being an umbrella-shaped body with stinging tentacles around the edge.
Is Medusozoa hydriforme a phylum?
Polypodium hydriforme. Medusozoa is a clade in the phylum Cnidaria, and is often considered a subphylum.
What is the difference between Hydrozoa and Staurozoa?
Staurozoans can be regarded as large polyps that have partially differentiated into sexually mature medusae. These spawn gametes which develop into non-swimming planulae that crawl away to new locations. Hydrozoa is a large group of solitary and colonial cnidarians from both marine and freshwater environments worldwide.
