Scyphozoa - Wikipedia
Fossilized stranded scyphozoans on a Cambrian tidal flat at Blackberry Hill, Wisconsin. The Scyphozoa are an exclusively marine class of the phylum Cnidaria, [2] referred to as the true jellyfish (or "true jellies").
Scyphistoma | invertebrate zoology | Britannica
A sessile polyp (scyphistoma) stage asexually buds off young medusae from its upper end, with each such ephyra growing into an adult. The adults are either male or female, but in some species they change their sex as they age. In many species, normal fusion of egg and…
28.2C: Class Scyphozoa - Biology LibreTexts
2023年10月31日 · Scyphozoans are dioecious animals, having separate sexes. The gonads are formed from the gastrodermis with gametes expelled through the mouth. Planula larvae are formed by external fertilization; they settle on a substratum in a …
Jellyfish life cycle (Scyphozoa) - University of California, Merced
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.
PHYLUM CNIDARIA: CLASS SCYPHOZOA - Marine Biological …
The planktonic, cigar-shaped planulae typically settle to the bottom after several hours or days and develop into tentacle-bearing polyps (scyphistomae). The sessile scyphistoma, reaching a few millimeters in height, may reproduce asexually, generally …
Evolution and development of scyphozoan jellyfish
2018年2月14日 · Scyphozoan jellyfish, or scyphomedusae, are conspicuous members of many ocean ecosystems, and have large impacts on human health and industry. Most scyphomedusae are the final stage in a complex life cycle that also includes two intermediate stages: the larval planula and benthic polyp.
ADW: Scyphozoa: INFORMATION
A larva metamorphoses into a small polyp termed the scyphistoma. Scyphistomae commonly produce more scyphistomae asexually. Eventually, a scyphistoma becomes a strobila, in which the distal end develops into a medusa-like animal.
The elusive life cycle of scyphozoan jellyfish – metagenesis revisited
2015年7月8日 · In early spring, ephyrae develop into young medusae. These grow through summer, reach sexual maturity, reproduce sexually and subsequently die. Planula-larvae sink to the seabed, settle and metamorphose into scyphistoma-polyps. Scyphistomae reproduce asexually through strobilation, or produce cysts.
Dynamic Model for Life History of Scyphozoa - PMC - National …
2015年6月26日 · In the paper, we will propose a two-dimensional dynamic model governed by ordinary differential equations to characterize the dynamics of the life history of scyphozoa and provide insight into the mechanisms of jellyfish blooms.
Aurelia Jellyfish (Strobila Stage) - National MagLab
2015年11月13日 · Embryos are spawned in the mother and develop into gastrulae, or planula larvae. Once released, each larva lives on its own until it finds an appropriate surface to which it attaches, growing into a polyp known as a scyphistoma.