Planula, plural planulae, free-swimming or crawling larval type common in many species of the phylum Cnidaria (e.g., jellyfish, corals, and sea anemones). The planula body is more or less cylindrical or egg-shaped and bears numerous cilia (tiny hairlike projections), which are used for locomotion..
Also, what is a planula larvae?
A planula is the free-swimming, flattened, ciliated, bilaterally symmetric larval form of various cnidarian species and also in some species of Ctenophores. Some groups of Nemerteans also produce larvae that are very similar to the planula.
is a cnidaria a Protostome or Deuterostome? CnidariaInvertebrate phylum that includes animals such as jellyfish and corals; characterized by radial symmetry, tissues, and a stinger called a nematocyst. deuterostomesAnimals in which the coelom forms from a pouch of endoderm. protostomesAnimals in which the coelom forms within the mesoderm.
Hereof, what is the larval stage of cnidarians?
Eggs are fertilized by sperm (sexual reproduction) and develop into the larval stage, during which they are still free-swimming and are called planulae. Once the larva reaches a certain stage of development it will attach to the substrate and become a polyp.
What specialized cells do cnidarians use for protection?
Cnidarians contain specialized cells known as cnidocytes (“stinging cells”) containing organelles called nematocysts (stingers). These cells are present around the mouth and tentacles, and serve to immobilize prey with toxins contained within the cells.
Related Question Answers
What is Parenchymula?
parenchymula A sponge larva in which the area of non-flagellate cells is very small. A Dictionary of Zoology. × "parenchymula ." A Dictionary of Zoology . .How do Planulas move?
Planula, plural planulae, free-swimming or crawling larval type common in many species of the phylum Cnidaria (e.g., jellyfish, corals, and sea anemones). The planula body is more or less cylindrical or egg-shaped and bears numerous cilia (tiny hairlike projections), which are used for locomotion.What is Parenchymula larva?
involves a ciliated parenchymula-larva. The released larva swims around for a while and then, after a period of between 3 and 48 hours, it attaches, usually with the anterior, larval cavity-bearing pole, onto the sub- stratum.What is a Trochophore larva?
Trochophore, also called trochosphere, small, translucent, free-swimming larva characteristic of marine annelids and most groups of mollusks. Trochophores are spherical or pear-shaped and are girdled by a ring of cilia (minute hairlike structures), the prototroch, that enables them to swim.What is Cydippid larva?
cydippid larva A free-swimming, larval stage of a ctenophorid (Ctenophora) which resembles adults of the order Cydippidea. A Dictionary of Zoology. × "cydippid larva ." A Dictionary of Zoology . .How do Cnidocytes work?
Cnidocytes are a distinctive feature of cnidarians (jellyfishes, sea anemones, corals, hydrae, etc.). These are explosive cells used by cnidarians in order to capture their prey (e.g. fish and crustaceans). These cells shoot off threadlike, often toxic, tubule inside the cnidocyst.What causes a planula larvae to settle?
The fertilized eggs develop into free-swimming planula larvae that settle to form primary polyps. Polyps also bud medusae that become sexually mature males or females. A fertilized egg develops to form a planula larva that then develops into a polyp.How many life stages does a jellyfish go through?
The fact is, though, that jellyfish have complex life cycles, in which they go through no less than six different developmental stages. In the following slides, we'll take you through the life cycle of a jellyfish, all the way from fertilized egg to full-grown adult.Are cnidarians asexual?
Reproduction of cnidarians can be either asexual by budding or sexual using gametes. Depending on the species, cnidarians can be monoecious or dioecious. Cnidarians usually cycle between a medusa stage and a polyp stage during their life cycle.What are some examples of cnidarians?
True jellyfishes Sea anemones and corals Sea anemone Box jellyfish MyxozoaHow do anthozoa reproduce?
Anthozoans remain polypoid throughout their lives. They can reproduce asexually by budding or fragmentation, or sexually by producing gametes. Both gametes are produced by the polyp, which can fuse to give rise to a free-swimming planula larva.How do Coelenterates reproduce?
Reproduction of Cnidarians Medusae usually reproduce sexually using eggs and sperm. Depending on the species, cnidarians can be monoecious (also called hermaphroditic), with individuals capable of producing both eggs and sperm, or they can be dioecious, with individuals of separate sexes for gamete production.How do sponges reproduce?
Sponges may reproduce sexually and asexually. After fertilization in the sponge, a larva is released into the water. It floats around for a few days and then sticks to a solid to begin its growth into an adult sponge. Sponges are also able to reproduce asexually through budding.How do Medusa reproduce?
polyp and medusa: Reproduction. The medusae then produce new polyps by sexual reproduction. A medusa produces eggs or sperm, which are usually shed into the water; when an egg is fertilized, it develops into a swimming larva, which eventually settles and grows into a polyp.How do scyphozoa reproduce?
Scyphozoa exhibit both sexual (medusa) and asexual (polyp) reproduction. While both forms are present, the medusa (sexual) form predominates. Sexual reproduction is not internal. The scyphistoma will reproduce asexually via budding into stroblia.Do Anthozoans reproduce sexually or asexually?
These animals can reproduce sexually in an ordinary way or by parthenogenesis. Asexual reproduction occurs in various forms, such as transverse and longitudinal fission, pedal laceration, or autotomy of tentacles.Why are cnidarians Diploblastic?
Cnidarians are diploblastic, have organized tissue, undergo extracellular digestion, and use cnidocytes for protection and to capture prey.Are humans Protostomes or Deuterostomes?
The bilaterian tree unites two major clades, deuterostomes (e.g. humans) and protostomes (e.g. flies) [1]. Protostome species such as insects, nematodes, annelids, and mollusks have served as invaluable model organisms.Are humans Deuterostomes examples?
Deuterostomes are also known as enterocoelomates because their coelom develops through enterocoely. Echinodermata (starfish, sea urchins, sea cucumbers, etc.) Since humans are chordates (we have a backbone), ee are Deuterostomes. 
