Additionally, some hydrozoan species (particularly in Turritopsis genus) share an unusual life cycle among the animals - they can transform themselves from sexually mature medusae stage back to their juvenile hydroid stage.

Hydroids have three basic life-cycle stages: (1) a tiny free-swimming ciliated planula larva about 1 mm (0.04 inch) long, which settles and metamorphoses into (2) a sessile (attached), usually colonial polyp stage, which in turn liberates (3) a gamete-producing male or …

Hydrozoans have a complex life cycle, usually with two or three morphologically different stages. The classic cycle starts with fertilized eggs developing into small, free swimming larvae called planulae, which may be able to enter a dormant resting state to …

2016年8月1日 · The typical hydrozoan life cycle comprises three basic forms: the motile ‘planula’ larva, sessile polyps (which typically propagate to form extensive colonies by asexual reproduction), and the pelagic medusa, a sexual form usually generated by budding from a polyp (in contrast to the scyphozoan medusa, which forms by a process known as ...

2023年10月31日 · The life cycle of Hydrozoans includes both the medusa stage and the polyp, although details vary between species. While jellyfish and hydrozoans have some similarities, both are different types of cnidarians, with distinct characteristics and life cycles.

Hydrozoa is a diverse and wide-ranging taxonomic class (sometimes superclass) of marine and freshwater invertebrates within the phylum Cnidaria, whose members are characterized by a life cycle that always includes the presence of planula larva, and the medusa, if present, having a velum, or muscular projection from the subumbrellar margin ...

The stages of the hydromedusan life cycle In most Hydrozoa, embryonic development originates a lecitotrophic planu- la larva. In some subclasses of hydromedusae retained as primitive (the...

Most hydrozoans observed in the North-East Atlantic are hydroids. A hydroid has typically three life-cycle stages. The first stage is a tiny pelagic larva. The larva develops into a second, often colonial, hydroid stage. The colony may be pelagic (free-swimming) or sessile (attached to a …

What is Hydrozoa life cycle? Most, but not all cnidarian species in the class Hydrozoa have a life cycle in which a colonial, asexually reproducing hydroid phase alternates with a free-swimming, sexually reproducing medusa phase.

The life cycle of Hydrozoa is very similar to that of disc jellyfish. They, too, have separate sexes. The polyp stage can reproduce asexually and form colonies.