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n. pl. plan·u·lae (-lē′)
The flat, free-swimming, ciliated larva of a cnidarian.

[New Latin plānula, from Latin, feminine diminutive of plānus, flat (from its shape); see pelə- in Indo-European roots.]

plan′u·lar, plan′u·late′ (-lāt′) adj.


n, pl -lae (-ˌliː)
(Zoology) the ciliated free-swimming larva of hydrozoan coelenterates such as the hydra
[C19: from New Latin: a little plane, from Latin plānum level ground]
ˈplanular adj


(ˈplæn yə lə)

n., pl. -lae (-ˌli)
the free-swimming larva of a cnidarian.
[1865–70; < New Latin, diminutive of Latin plānum something flat. See plane1, -ule]
plan′u•lar, plan′u•late (-ˌleɪt) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.planula - the flat ciliated free-swimming larva of hydrozoan coelenteratesplanula - the flat ciliated free-swimming larva of hydrozoan coelenterates
hydroid, hydrozoan - colonial coelenterates having the polyp phase dominant
References in periodicals archive ?
Re-establishment of coral populations is highly dependent on settlement of coral planulae, post-settlement survival, and juvenile coral growth.
Settlement induction of Acropora palmata planulae by a GLW-amide neuropeptide.
These chemicals serve as signals that activate planulae settlement by initiating morpho-physiological changes (83).
Whole trophosomes were detached and then accumulated on the shoreline, probably due to a massive settlement of planulae on an unsuitable substrate.
Planulae, shaken from the brooding structures of adult medusae caught in the field, settled and metamorphosed into scyphistomae in the lab and were maintained in culture.
Corals indeed do have such free living, planktonic larvae, called planulae.
Corals are either brooders, which release internally fertilized planulae, or broadcast spawners, which release eggs and sperm (Harrison and Wallace 1990).
1983; Neigel and Avise 1983; Lasker 1984; Wallace 1985; Willis and Ayre 1985; Wulff 1986, 1991; Ayre and Willis 1988; Hunter 1993), "budding" asexual propagules (Walker and Bull 1983; Dahan and Benayahu 1997), the release of asexual planulae (Black and Johnson 1979; Stoddart 1983a; Ayre and Resing 1986), [TABULAR DATA FOR TABLE 1 OMITTED] and polyp bailout (Sammarco 1982; Richmond 1985; Kramarskywinter et al.
When these sections were submerged in seawater, we collected the fully developed planulae that swam free.
alata could explain the patterns we have observed, it seems more likely that genetic metapopulation cohesion is maintained via dispersal through the swimming medusa stage, and perhaps via dispersal of encysted planulae, which are described here for the first time in Alatina.
2008); rapid colonization of empty substrates as a result of a high investment in sexual reproduction and periodic release of planulae resistant to limiting resources (Smith 1997, Kramer 2003).
The lighter, more water-soluble fractions of crude oil have sub-lethal toxic effects on corals, adversely affecting their reproduction and causing abortion of immature planulae.