What is Scyphistoma larva?
Scyphistoma is the fixed polyp-like stage in the life cycle of a jellyfish, which reproduces asexually by budding and produces free-swimming medusae. It is a larva of scyphozoan.
What do Scyphozoans look like?
Scyphozoans exhibit the main characteristics of cnidarians. They have radial symmetry and are diploblastic, meaning that their body wall consists of the outer epidermis (ectoderm) and the inner gastrodermis (endoderm), which are separated by mesoglea. They have nematocysts, which are characteristic of the phylum.
Where is Scyphistoma found?
A jellyfish contracting its body. Free-swimming scyphozoan jellyfish occur in all oceans and include the familiar disk-shaped animals that are often found drifting along the shoreline. Most live for only a few weeks, but some are known to survive a year or longer.
Is Aurelia Scyphistoma a polyp or medusa?
The asexual stage is polyp (scyphistoma), whereas the sexual adult stage is medusa.
Are jellyfish part of Animalia?
Jellyfish are mainly free-swimming marine animals with umbrella-shaped bells and trailing tentacles, although a few are anchored to the seabed by stalks rather than being mobile….
| Jellyfish | |
|---|---|
| Kingdom: | Animalia |
| Phylum: | Cnidaria |
| Subphylum: | Medusozoa |
| Groups included |
What kind of animal is larva jellyfish Aurelia )?
> Planula is a free swimming or crawling larva of Cnidarians. The body of planula is cylindrical or egg shaped which has many cilia which is used for locomotion.
How do you identify a Scyphozoa?
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 largest known species of jellyfish?
Growing up to 120 feet long with bells up to 8 feet wide, the lion’s mane jelly is the largest known jelly species out there. They can have up to 1,200 tentacles, which originate from under the bell in 8 distinct clusters of 70 and 150 tentacles each. These tentacles contain large amounts of neurotoxins.
Which stages of Aurelia are benthic?
Aurelia undergoes alternation of generations, whereby the sexually-reproducing pelagic medusa stage is either male or female, and the benthic polyp stage reproduces asexually.
What is the size of a scyphistoma larva?
This stage of a scyphozoan polyp is known as scyphistoma larva, and it is about 1.25 cm in length. xiii. Several transverse constrictions appear on the larva and, as the constrictions grow deeper, the larva appears like a pile of discs, one placed above the other.
What is a scyphistoma in a planula?
The planula metamorphoses into a sessile (i.e. fixed-position), usually benthic (i.e. bottom dwelling) polyp called a ‘scyphistoma’ and it is the scyphistoma, still attached to the surface on which the planula settled, that produces a new free-swimming medusa.
What is the life cycle of a Scyphomedusae?
Scyphomedusae are the “jellyfish” with which most people are familiar. The scyphozoan life cycle varies from order to order. The medusae are gonochoric. Fertilized eggs may be brooded for a time or may develop directly into a free-swimming, ciliated planula larva.
What is the difference between scyphistoma and strobila?
Eventually, a scyphistoma becomes a strobila, in which the distal end develops into a medusa-like animal. The strobila may look like a stack of saucers, the saucers being the immature medusae called ephyrae. As formation of the ephyrae is completed, each breaks away and eventually grows into a sexually-reproducing adult medusa.