A planula is the free-swimming, flattened, ciliated, bilaterally symmetricallarva of a hydrozoancnidarian. It navigates through the water until it reaches a hard substrate where it anchors and grows into a polyp. Planulas are unable to feed themselves. cross-section of two motile cilia, showing the 9+2 structure BRIAN LANDS IS A FAG!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! BRIAN LANDS IS A FAG!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! BRIAN LANDS IS A FAG!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! BRIAN LANDS IS A FAG!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! BRIAN LANDS IS A FAG!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! A cilium (plural cilia) is an organelle projecting from a eukaryotic cell. ... In biology, bilateral symmetry is a characteristic of multicellular organisms, particularly animals. ... A larva (Latin; plural larvae) is a juvenile form of animal with indirect development, undergoing metamorphosis (for example, insects or amphibians). ... Orders Actinulida Capitata Chondrophora Filifera Hydroida Siphonophora Trachylina Organisms that are in Class Hydrozoa come from the Phylum Cnidaria. ... Classes Anthozoa - Corals and sea anemones Cubozoa - Sea wasps or box jellyfish Hydrozoa - Hydroids, hydra-like animals Scyphozoa - Jellyfish Cnidaria (from New Latin cnida nematocyst, fr. ... In zoology, a polyp is one of two forms of individuals found in many species of cnidarians. ...
Both embryonic and larval stages, the planula and the polyp, are typically diploblastic; the adult sexual stages, the hydromedusae, acquire a triploblastic kind of organization during embryonic development (medusary nodule formation).
The marginal sense organs are internal, enclosed ecto-endodermal statocysts that are embedded in the mesoglea near the ring canal or in the velum.
Planulae can be solid (stereogastrula) or hollow (coeloblastula); usually the species with medusae in the lifecycle have hollow planulae that live part of their life in the water column, swimming with cilia or flagella to reach the settling sites.
The arrival of new juvenile corals to renew populations is an essential process for the long-term viability of diverse coral reef communities.
Planulae may be produced via external fertilisation or brooding.
Planulalarvae can settle onto a variety of substrates, but recent research suggests that certain chemicals found in reef environments can actively promote attachment of the larvae and stimulate metamorphosis into single coral polyps.
Feeds |
Contact