What is the mobile stage of the cnidarian life cycle?
Table of Contents
What is the mobile stage of the cnidarian life cycle?
The free-swimming, mobile stage of the cnidarian life cycle. This stage, when present, is reproductive and mature gonads form on either male or female medusae. A common example is the jellyfish. The jellylike layer found between the ectodermal and endodermal cell layers of diploblastic organisms.
What life stage of cnidarians are jellyfish?
medusa stage
What are the stages of a cnidarian?
They have two different morphologies: a polyp stage and a medusa stage (not all classes will have both through out their life time). Both stages have radial symmetry. The polyp stage tends to be sessile and the medusa stage is mobile. Some species of Cnidarians have bioluminescence.
Are jellyfish sessile or mobile?
Scyphozoan jellyfish can be divided into two types, those that are free-swimming medusae and those that are sessile (i.e., stem animals that are attached to seaweed and other objects by a stalk). The sessile polyplike forms constitute the order Stauromedusae. A jellyfish contracting its body.
What is the mobile stage of a cnidarian?
They have two different morphologies: a polyp stage and a medusa stage (not all classes will have both through out their life time). Both stages have radial symmetry. The polyp stage tends to be sessile and the medusa stage is mobile. Some species of Cnidarians have bioluminescence.
What are the stages of life for a cnidarian?
Cnidarians all have a life cycle of two forms. One is a free-swimming jellyfish medusa stage and the second is an attached polyp stage
What are the two stages in the life cycle of cnidarians?
The two forms of cnidarians are polyp and medusae. A polyp is a sedentary form, whereas medusae are free-swimming. Some of the cnidarians such as Obelia show metagenesis, i.e. alternation of generation and have both these forms in their life cycle.
Are cnidarians sessile or mobile?
Cnidarians have two distinct morphological body plans known as polyp, which are sessile as adults, and medusa, which are mobile; some species exhibit both body plans in their lifecycle.
Is a jellyfish a cnidarian?
Corals, anemones, things we call hydroids, sea pens, and jellyfish, lists Dr. Ames. They all belong to the phylum Cnidaria (pronounced ny DARE ee – a). A phylum is one of the large groupings used in taxonomical classification to refer to a group of creatures that has evolved from a common ancestor.
Is a jellyfish medusa or polyp?
Throughout their lifecycle, jellyfish take on two different body forms: medusa and polyps. Polyps can reproduce asexually by budding, while medusae spawn eggs and sperm to reproduce sexually. Learn more about the lifecycle and reproduction of jellyfish.
What is a medusa stage?
The medusa is the reproductive stage; their eggs are fertilised internally and develop into free-swimming planula larvae. After a brief period floating about in surface waters, the larvae settle to the sea floor, attaching themselves at one end. There they develop into polyps and begin to feed and grow.
What is the correct order of stages in the cnidarian life cycle?
Cnidarians often have a life cycle consisting of planula larva, polyp, and medusa stages.
What are the stages of growth and development for Cnidaria?
Cnidarians often have a life cycle consisting of planula larva, polyp, and medusa stages.
What are the 4 classes within Cnidaria?
immortal jellyfish The life cycle of the Hydrozoa is typically characterized by the alternation of three life stages: the planula larva, the postlarval polyp stage (mainly colonial), and the adult stage, i.e., the medusa (Boero et al. 2002).
What are the 3 layers of cnidarians?
There are four major groups of cnidarians:
- Anthozoa, which includes true corals, anemones, and sea pens;
- Cubozoa, the amazing box jellies with complex eyes and potent toxins;
- Hydrozoa, the most diverse group with siphonophores, hydroids, fire corals, and many medusae; and.
- Scyphozoa, the true jellyfish.
Is jellyfish motile or sessile?
Mobility. Sessile animals typically have a motile phase in their development. Sponges have a motile larval stage and become sessile at maturity. Conversely, many jellyfish develop as sessile polyps early in their life cycle
Are jellyfish sessile colonies?
The jellyfish polyp may be sessile, living on the bottom, boat hulls or other substrates, or it may be free-floating or attached to tiny bits of free-living plankton or rarely, fish or other invertebrates. Polyps may be solitary or colonial
Are jellyfish motile?
These animals are usually cylindrical in shape and are attached to a substrate. A mouth opening is surrounded by tentacles bearing cnidocytes ([Figure 5]). Scyphozoans include all the jellies and are motile and exclusively marine with about 200 described species.
What type of cell is a jellyfish?
Jellyfish are more complex than you’d thinkand one of their most fascinating parts is their stinging cells. Located on their tentacles, jellyfish’s stinging cells are called cnidocytes.
What are the two stages of cnidarians?
Cnidarians all have a life cycle of two forms. One is a free-swimming jellyfish medusa stage and the second is an attached polyp stage
What are the two major life stages of the cnidarians?
Cnidarians often have a life cycle consisting of planula larva, polyp, and medusa stages.
How do all cnidarians begin their life?
Cnidarians have separate sexes and many have a lifecycle that involves two distinct morphological formsmedusoid and polypoidat various stages in their life cycles. In species with both forms, the medusa is the sexual, gamete-producing stage and the polyp is the asexual stage.
What are the stages of cnidarians?
They have two different morphologies: a polyp stage and a medusa stage (not all classes will have both through out their life time). Both stages have radial symmetry. The polyp stage tends to be sessile and the medusa stage is mobile. Some species of Cnidarians have bioluminescence.
What are the two stages of the cnidarian life cycle quizlet?
two stages in life cycle: polyp and medusa The eggs and sperm are released into the water and join to form a fertilized egg or zygote. The zygote goes through multiple cell divisions to form a free-swimming, ciliated larval stage, Planula.
What are the two layers of cnidarians?
Cnidarians often have a life cycle consisting of planula larva, polyp, and medusa stages.