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planula

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WordNet (r) 3.0 (2006) (WordNet)

planula
n 1: the flat ciliated free-swimming larva of hydrozoan
coelenterates

The Collaborative International Dictionary of English v.0.48 (gcide)

Planula \Plan"u*la\, n.; pl. {Planul[ae]}. [L., a little plane.]
1. (Biol.) In embryonic development, a vesicle filled with
fluid, formed from the morula by the divergence of its
cells in such a manner as to give rise to a central space,
around which the cells arrange themselves as an envelope;
an embryonic form intermediate between the morula and
gastrula. Sometimes used as synonymous with {gastrula}.
[1913 Webster]

2. (Zool.) The very young, free-swimming larva of the
c[oe]lenterates. It usually has a flattened oval or oblong
form, and is entirely covered with cilia.
[1913 Webster]

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英文字典中文字典相关资料:

Planula - Wikipedia
A planula is the free-swimming, flattened, ciliated, bilaterally symmetric larval form of various cnidarian species and some species of Ctenophores, which are not closely related to cnidarians
Planula | Cnidarian Larvae, Polyp Development Embryonic Development . . .
Planula, 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
Planula - an overview | ScienceDirect Topics
The cnidarian larval form, the planula, is typically elongated along the principle “oral-aboral” body axis, and made up of the two basic cnidarian tissue layers: epidermis and gastrodermis
The Life Cycle of a Jellyfish - ThoughtCo
The small larva called a planula swims in water before becoming a polyp on the sea floor Polyp colonies transform into baby jellyfish called ephyra, which grow into adult jellyfish
PLANULA Definition Meaning - Merriam-Webster
The meaning of PLANULA is the very young usually flattened oval or oblong free-swimming ciliated larva of a cnidarian
Planula: Definition, Life Cycle Role in Cnidaria Biology - Vedantu
A planula is the free-swimming, flattened, ciliated, and bilaterally symmetric larval stage characteristic of species in the phylum Cnidaria (e g , jellyfish, corals, sea anemones)
Cnidarian Larvae: True Planulae, Other-Than-Planulae, and Planulae That . . .
Almost all cnidarians have a pelagic larva in their life cycle These larvae are commonly referred to as “planula,” with few exceptions The planula is a ciliated lecithotrophic larva with epithelial ectoderm and endoderm, a gastric cavity, and an elongated body
Planula
The planula is a small, ciliated, bilaterally symmetrical larva that represents the free-swimming developmental stage in the life cycle of most cnidarians, including members of the classes Hydrozoa, Scyphozoa, Cubozoa, and Anthozoa such as jellyfish, corals, and sea anemones
What is the function of planula? - GNA
The planula is the free-swimming, ciliated larval stage characteristic of many cnidarians, serving primarily as a dispersal mechanism that allows the organism to colonize new areas and find suitable substrates for sessile adult development
Planula Definition - Marine Biology Key Term | Fiveable
A planula is a free-swimming larval stage of cnidarians, such as jellyfish, corals, and sea anemones This early life stage is typically characterized by a flattened, oval shape and covered in cilia, which help it swim in the water column

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