Polyp (zoology) - Wikipedia
A polyp in zoology is one of two forms found in the phylum Cnidaria, the other being the medusa. Polyps are roughly cylindrical in shape and elongated at the axis of the vase -shaped body. In solitary polyps, the aboral (opposite to oral) end is attached to the substrate by means of a disc-like holdfast called a pedal disc , while in colonies ...
Here are the polyps: in situ observations of jellyfish polyps and ...
2018年9月19日 · Polyps and podocysts were identified to species level by 18S rDNA and mitochondrial COI sequencing. The three polyps found on Dogger Bank all belonged to the compass jellyfish Chrysaora hysoscella. One podocyst from the Oostende beach also belonged to this species but another podocyst belonged to Cyanea lamarkii.
The Life Cycle of a Jellyfish - ThoughtCo
2019年7月3日 · After settling to the sea floor, the planula larva attaches itself to a hard surface and transforms into a polyp (also known as a scyphistoma), a cylindrical, stalk-like structure. At the base of the polyp is a disc that adheres to the substrate, and at its top is a mouth opening surrounded by small tentacles.
Jellyfish Lifecycle and Reproduction | Smithsonian Ocean
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.
Scyphozoa - Wikipedia
Most species of Scyphozoa have two life-history phases, including the planktonic medusa or polyp form, which is most evident in the warm summer months, and an inconspicuous, but longer-lived, bottom-dwelling polyp, which seasonally gives rise to new medusae.
Jellyfish polyps - NIOZ
For most of their life, most jellyfish species are actually bottom-dwelling animals. They live as tiny polyps attached to hard surfaces such as stones, shells, wood, and man made structures of steel, concrete and plastic. Or so we think: for many species of jellyfish, these bottom-dwelling polyps have never been observed in the natural environment.
Jellyfish Life Histories: Role of Polyps in Forming and Maintaining ...
2012年1月1日 · The aim of this review is to synthesise the current state of knowledge of polyp ecology by examining (1) the recruitment and metamorphosis of planulae larvae into polyps, (2) survival and longevity of polyps, (3) expansion of polyp populations via asexual propagation and (4) strobilation and recruitment of ephyrae (juvenile medusae).
Here are the polyps: in situ observations of jellyfish polyps and ...
2020年5月28日 · The three polyps found on Dogger Bank all belonged to the compass jellyfish Chrysaora hysoscella. One podocyst from the Oostende beach also belonged to this species but another podocyst belonged to Cyanea lamarkii. These are the first in situ observations of C. hysoscella and C. lamarckii polyps and podocysts in the natural environment.
Where are the polyps? Molecular identification, distribution and ...
2016年7月18日 · To gain insight in the distribution, species composition and population structure of scyphozoan jellyfish polyps in the southern North Sea area, polyp samples were collected from natural and artificial substrates (settling plates, marina floats and wrecks) at ten inshore locations in the Netherlands, seven offshore locations in the North Sea ...
The genome of the jellyfish Clytia hemisphaerica and the evolution …
2019年3月11日 · In Anthozoa (corals and anemones), the polyp is the sexually reproductive form but, in the medusozoan branch of Cnidaria, polyps generally produce sexually reproductive jellyfish by a process...