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Planula
 
 
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A planula is the free-swimming, flattened, ciliated
Cilium

A cilium is an organelle found in eukaryote cell s. Cilia are tail-like projections extending approximately 5?10 micrometres from the cell body....
, bilaterally symmetric
Symmetry (biology)

Symmetry in biology is the balanced distribution of duplicate body parts or shapes. The body plans of most multicellular organisms exhibit some form of symmetry, either radial symmetry or bilateral symmetry or glide symmetry....
 larval form
Larva

A larva is a young form of animal with indirect developmental biology, going through or undergoing metamorphosis .The larva can look completely different from the adult form, for example, a caterpillar differs from a butterfly....
 of various cnidaria
Cnidaria

Cnidaria Cnidarians were for a long time grouped with Ctenophores in the phylum Coelenterata, but increasing awareness of their differences caused them to be placed in separate phyla....
n species. In all cases, the planula forms directly from the fertilized egg of a medusa, as the case in scyphozoans and some hydrozoans, or from a polyp, as in the case of anthozoans. Depending on the species, the planula either metamorphoses directly into a free-swimming, miniature version of the adult form (such as many open-ocean scyphozoans), or navigates through the water until it reaches a hard substrate (many may prefer specific substrates) where it anchors and grows into a polyp
Polyp

In zoology, a polyp is one of two forms of individuals found in many species of cnidarians. The two are the polyp or hydroid and the medusa . Polyps are approximately cylindrical, elongated on the axis of the body....
 (including all anthozoans with a planula stage, many coastal scyphozoans, and some hydrozoans).






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Encyclopedia


A planula is the free-swimming, flattened, ciliated
Cilium

A cilium is an organelle found in eukaryote cell s. Cilia are tail-like projections extending approximately 5?10 micrometres from the cell body....
, bilaterally symmetric
Symmetry (biology)

Symmetry in biology is the balanced distribution of duplicate body parts or shapes. The body plans of most multicellular organisms exhibit some form of symmetry, either radial symmetry or bilateral symmetry or glide symmetry....
 larval form
Larva

A larva is a young form of animal with indirect developmental biology, going through or undergoing metamorphosis .The larva can look completely different from the adult form, for example, a caterpillar differs from a butterfly....
 of various cnidaria
Cnidaria

Cnidaria Cnidarians were for a long time grouped with Ctenophores in the phylum Coelenterata, but increasing awareness of their differences caused them to be placed in separate phyla....
n species. In all cases, the planula forms directly from the fertilized egg of a medusa, as the case in scyphozoans and some hydrozoans, or from a polyp, as in the case of anthozoans. Depending on the species, the planula either metamorphoses directly into a free-swimming, miniature version of the adult form (such as many open-ocean scyphozoans), or navigates through the water until it reaches a hard substrate (many may prefer specific substrates) where it anchors and grows into a polyp
Polyp

In zoology, a polyp is one of two forms of individuals found in many species of cnidarians. The two are the polyp or hydroid and the medusa . Polyps are approximately cylindrical, elongated on the axis of the body....
 (including all anthozoans with a planula stage, many coastal scyphozoans, and some hydrozoans). Planulae of the subphylum Medusozoa have no mouth or digestive tract and are unable to feed themselves, while those of Anthozoa
Anthozoa

Anthozoa is a class within the phylum Cnidaria that contains the sea anemones and corals. Unlike other cnidarians, anthozoans do not have a medusa stage in their development....
 can feed.